- If you have a vehicle with climate control system and a variable speed blower motor and the blower motor won’t shut off and stays on HIGH with the car turned off and the key out, chances are the blower motor motor control processor is toast or the HVAC control module is damaged.
What causes a blower motor to keep running?
Well, if your furnace blower fan won’t stop running, you could have any of the following problems: You’re using the wrong thermostat fan setting. There’s a shorted thermostat wire. There’s a shorted wire at the fan limit switch.
Why is my air handler constantly running?
When your system’s air filter is full of dirt and debris, the flow of air is restricted, which can impede the functioning of your air conditioner. Without enough air flowing over the coils, the system can’t remove humidity and cool the air to the set temperature, so it keeps running when it shouldn’t.
How do I reset my blower motor?
How to Find and Reset your Furnace Motor Blower
- Step 1: Turn off the power to the furnace.
- Step 2: Remove the blower compartment cover.
- Step 3: Make sure the blower is completely cooled off.
- Step 4: Locate the reset button.
- Step 5: Press the button in (assuming that this is your issue and that the button has popped).
Why will a blower run on the on position and not on auto?
Other Blower Fan Won’t Run Problems The fan will run and blow warm air but only in FAN or FAN ON mode – delivering heat – but NOT in AUTO mode. This is a bad temperature sensor in the unit; replace the fan limit controller.
Why won’t my furnace shut off?
If it’s cold, that means that your furnace is not running but the air handler is still blowing air. If the air that the furnace is blowing is hot, that means that the furnace burners aren’t turning off. Two very common causes are that the thermostat is set too high, or the filters being dirty.
Why does my gas furnace fan keep running?
The fan control should be set to AUTO. You can try turning the switch to OFF too. Other snafus such as a shorted thermostat wire can also cause the A/C or warm air furnace fan to run continuously. at THERMOSTAT WON’T TURN OFF.
Why does the fan run when thermostat is off?
Over time, relay switches can become stuck or damaged, preventing the thermostat from communicating with the fan. Essentially, this means that the fan isn’t receiving the commands you’re relaying to the thermostat. So even if you turn your AC off, the fan will continue to run.
Why does my furnace blower keeps turning on and off?
If your blower is constantly turning on/off when the furnace isn’t heating… you most likely have a bad fan limit switch. So if your furnace blower is turning on and off when the furnace isn’t in a heat cycle, it usually means the fan limit switch is defective.
Is it OK for central air to run continuously?
The constant running will reduce pressure in the cooling coil until it freezes over, which is dangerous as it can cause liquid refrigerant to flood back to the compressor and damage it (the compressor is a very expensive part).
Why won’t my AC shut off?
When your air conditioning system keeps running and never seems to shut off, the problem could be linked to a number of malfunctioning components – frozen evaporator coils, a clogged air filter, a bad electrical relay switch that needs to be replaced, the fan blowing constantly, dirty condenser coils, a bad thermostat,
Do all blower motors have a reset button?
All furnaces are equipped with a reset button. They are generally red or yellow and are located inside the blower compartment. The reset button is a safety feature that will shut down the furnace when a problem is detected, often a hot or overheating furnace, before it trips the circuit breaker.
Is there a fuse for the blower motor?
Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.
Indoor fan won’t shut off unless I use the circuit breaker, Commonly Reported HVAC Problems
Calkins believes that the benefits of Top Tier gas, which is currently offered by the majority of major oil firms, outweigh the minor increase in price. According to the AAA, Top Tier gas, which applies to all grades of gasoline, is suggested because it helps to reduce carbon buildup in your engine. This accumulation can limit fuel economy and produce issues such as rough idling, acceleration hesitation, and engine knock, which is a rattling sound that happens when gas ignites early in the combustion chamber.
Detergents and additives, which oil firms use to improve the quality of the bulk fuel they purchase from refineries, are effectively used to produce their own mixes of gasoline.
According to Consumer Reports, Top Tier gasoline was developed in 2004 with the goal of going above and beyond these basic criteria in order to “better protect more complex engines from carbon buildup and deposits on the intake valves”.
Alternatively, you may look for a sign at the pump indicating that a merchant carries Top Tier gas on the Top Tier program’s website.
When it comes to engine knocking, it is a measure of how well the gas can withstand the rattling sound that happens when the gas is ignited too soon.
How your car’s engine is constructed determines what octane rating of gas it should use.
While it may seem that using higher octane petrol than your automobile requires is better for your car, this is not actually true.
Indoor fan won’t shut off unless I use the circuit breaker:
As a result, your indoor fan will never turn off. You’ve double-checked all the obvious possibilities. Notably, the thermostat’s fan switch is in the auto position rather than the on position. You’ve tried everything, even turning the thermostat to the off setting, but nothing works. That annoying fan can only be turned off by turning off the circuit breaker or pressing the Emergency Shut-off switch on the circuit breaker. Then this is the one to have if you ever have a problem with your heating and air conditioning system.
In addition, if you suffer from allergies, it is preferable to have your fan running continuously to filter more air in any case.
And keep in mind that running the engine continuously does not harm it or cause it to consume more energy. Last but not least, repairing this issue is typically not a costly repair procedure. Even so, do not ignore the situation and allow it to persist; instead, contact for assistance immediately.
So What Causes This?
- Therefore, your indoor fan will never turn off. All of the obvious things have been ticked off your list. Notably, the thermostat’s fan switch is in the auto position, not the on position. Nothing happens when you try to turn the thermostat to the off setting. That annoying fan can only be turned off by turning off the circuit breaker or pressing the Emergency Shut-off switch. Then this is the one to have if you ever have a problem with your heating or air conditioning system. It is still possible to have heating and air conditioning working properly even if your fan never shuts off. Furthermore, if you suffer from allergies, it is preferable to have your fan going all the time to filter more air. Furthermore, keep in mind that running the engine continuously does not harm it or cause it to consume more energy. Last but not least, repairing this issue is typically not a costly endeavor. Even so, do not ignore the situation and allow it to persist
- Instead, ask for help immediately!
That is pretty much the end of the story with this situation. To avoid becoming overly concerned if your fan fails to turn off, simply arrange a service appointment to get it repaired. The following is a list of plausible reasons for this problem. Items highlighted in red almost always necessitate a service call. The bottom four reasons highlighted in blue are regularly encountered issues that may be handled, if not completely resolved, by the homeowner. Help! Red indicates a professional remedy; blue indicates a homeowner fix.
- The fan relay is stuck
- The thermostat cable is shorted
- The thermostat is defective.
Note that the material on this website is supplied without charge, and Hannabery HVAC does not accept any responsibility for any actions taken as a result of the information we offer. If this material is helpful, please keep in mind that these are only general principles, and that not all conceivable circumstances are addressed. A qualified expert should evaluate and repair your heating, ventilation, and air conditioning system. HVAC Issues That Are Frequently Reported
How Comfortable Do You Want To Be?
Please contact us at 1-800-544-4328.
Why Does My Furnace Fan Keep Running?
Do you have a furnace fan that operates all the time? To begin, consider the following: Check to ensure that your thermostat’s fan setting is set to AUTO rather than ON. Once you’ve done so, set the thermostat to a setting that is 3 to 4 degrees Celsius cooler than the present room temperature and wait 3 to 4 minutes. Is the furnace fan still operating? That, on the other hand, is not typical. If your furnace fan would not turn off, you are most likely experiencing one of the following three issues:
- The “manual override” setting on your furnace’s fan limit switch is selected. It is necessary to replace the fan limit switch since it is malfunctioning. There is an issue with the wiring in your thermostat
Unfortunately, you’ll have to hire an expert to take care of those final two issues. However, before you bring in a professional, make sure that your fan limit switch is properly configured. This post will demonstrate how to accomplish this. Do you require a professional as soon as possible? Simply call us, and we’ll have your furnace fan operating regularly in no time at all.
Step 1: Locate your fan limit switch
You’ll find your fan limit switch within the furnace panel cover, generally at the upper right corner of the panel. The fan limit switch is in charge of ensuring that the blower is turned on and off at the proper timings. As a result, if the switch is functioning properly, your furnace fan should turn on several minutes after the thermostat indicates that heat is required and turn off several minutes after the heat cycle is completed. However, if your furnace fan continues to operate continually, regardless of whether the furnace is heating or not, your furnace fan limit switch is one of the following:
- You’ll find your fan limit switch within the furnace panel cover, generally at the upper right corner of the cover. The fan limit switch is in charge of ensuring that the blower is turned on and off when necessary. As a result, when the switch is functioning properly, your furnace fan should turn on several minutes after the thermostat indicates that heat is required and turn off several minutes after the heat cycle is completed. However, if your furnace fan continues to operate continually, regardless of whether the furnace is heating or not, your furnace fan limit switch is one of two things:
Now that you’ve discovered where your fan limit switch is, let’s have a look at how you can tell whether it’s properly configured.
Step 2: Make sure the white button is NOT pressed in
The fan limit switch will be a little white button located in the lower left corner of your fan. Using this button, you may inform the switch whether to operate manually (i.e., continuously run the fan) or automatically (run the fan only during heating cycles).
If the button is pressed in, the switch is set to Manual, and the fan is forced to operate constantly until the button is released. It will need to be reset to AUTO in order for the fan to function properly (see pic below for instructions).
Step 3: Call a professional if the fan is still running
A professional is required if your fan limit switch is set to AUTO, yet the fan continues to operate continuously without ever stopping. There are two issues that might be causing your fan to run continuously, and they are as follows:
- The fan limit switch is malfunctioning and has to be replaced
- The thermostat wiring is faulty.
Need help from an Atlanta furnace tech?
In the event that you’re still having problems with a furnace fan that won’t shut off, we’re here to assist you. Simply call us and we’ll dispatch an expert technician to your location as soon as feasible.
Related reading:
- There are 3 common furnace problems in Atlanta
- Furnace Troubleshooting: 4 Quick Fixes Before Calling a Professional
- 3 Common Furnace Problems in Atlanta
Furnace Blower Fan Wont Turn Off #1 Best Reason Why?
Three natural gas burners erupting in dazzling blue flames into an active furnace, the heart of a central heating system, generating radiant heat. The orange pilot light/filament in the lower left corner guarantees that the burners remain ignited.” data-image-caption=”” data-medium-file=” data-large-file=” data-small-file=” loading=”lazy” data-src=” alt=”Furnace Blower Fan Won’t Turn Off” data-src=” alt=”Furnace Blower Fan Won’t Turn Off” data-src=” alt=”Furnace Blower Fan Won’t Turn Off” data-src=” alt=”Furnace Blower Fan Won’t Turn Off” data-src=” alt=”Furnace Blower Fan Won’t Turn Off” data-s” a width of 156 and a height of 208 data-srcset=”300w,225w” data-srcset=”300w,225w” data-sizes=”(max-width: 156px) 100vw, 156px” data-sizes=”(max-width: 156px) 100vw, 156px The furnace blower fan will not turn off number one.
- title=”Furnace Blower Fan Won’t Turn Off Number One”>Furnace Blower Fan Won’t Turn Off Number One.
- I’m having an issue with my furnace where the inside blower is not working properly.
- It’s an older furnace, and I’ve double-checked the settings on the thermostat.
- In that case, what else do I need to check, and is this an issue that I can address myself, or do I need to call in a service and repair firm to take care of it for me?
- Thanks!
Furnace Blower Fan Wont Turn Off
There are several factors that might contribute to this incidence, including the following:
- The fan select switch on the thermostat is set to the manual “ON” position
- The thermostat is set to the manual “OFF” position. A issue with the control wire in which the insulation on the wiring has worn away
- A faulty relay, fan sequencer relay, fan limit controlor circuit board with contacts that are stuck (depending on the kind and age of the furnace)
- A bad fan
- A poor fan sequencer relay
- There is an issue with the limit switch, or there is a problem that is causing the limit switch to be opened.
Fan Select Switch – Furnace Blower Fan Wont Turn Off
This problem may be readily resolved by switching the thermostat’s automatic setting to the on position. You said that you have previously completed this task, thus this is not an issue for you. The number of individuals who make this error and fail to double-check this setting will surprise you. It is a list of fundamental checks that should be performed prior to contacting for help.
Control Wiring Problem | Furnace Blower Fan Wont Turn Off
A bundle of eight 18-gauge wires is available. ” data-medium-file=” data-large-file=” loading=”lazy” data-src=” alt=”Damaged Digital Thermostat Wiring Problem” data-src=” alt=”Damaged Digital Thermostat Wiring Problem” width: 300px; height: 199px; Heater Blower Fan Will Not Turn Off 2″ title=”Furnace Blower Fan Won’t Turn Off 2″> A bundle of eight 18-gauge wires is available. This is essentially the same as what some people refer to as a shorted circuit. For whatever reason, two wires are contacting one another and maintaining the circuit completed despite the fact that there is no control over it.
When the insulation is no longer there, the wires come into contact within the thermostat wire bundle.
In order to do a fast examination (and hopefully to address the problem), inspect the thermostat wire terminations at both the thermostat and furnace.
You will need to draw a new thermostat wire from the furnace to the temperature control device if this is not the case.
If there is an additional wire in the thermostat bundle, an alternative method will be to use that wire instead of the extra wire. Replace the excess wire with a green or red wire to match the existing color scheme (if one is available).
Bad Control Relay or Board – Furnace Blower Fan Won’t Turn Off
The sort of gas furnace you have will determine whether or not you have this problem. A control board will be seen on more advanced gas furnaces. Older furnaces will either employ a sequencer relay or a simple peanut relay to control the temperature. The thermostat will send an on/off instruction to the relay, which will then turn on and off the fan. The setpoint and mode of the thermostat are controlled by a switch that is dependent on the thermostat setting. All of these controllers include contacts as well as a coil inside of them for operation.
The only practical remedy in this case is to replace the control board or relay in question.
In either case, something is stuck when it shouldn’t be, and the gadget has to be changed in order to remedy the problem.
Limit Switch Issue | Furnace Blower Fan Wont Turn Off
An overheating limit switch will be activated if the furnace becomes too hot. The burners or heat source will be turned off as a result, and the fan will continue to run until the limit switch is closed again. When the limit switch is open for an extended period of time, the fan will continue to operate constantly. In addition, it will cause your system to not heat, thus I do not believe that this is relevant to your problem. If a limit switch is proven to be troublesome in the manner described below, it is recommended that it be replaced.
Things that might cause overheating while having a good time include:
- Having a filthy air filter that is either blocked or clogged is causing poor airflow. As part of routine furnace maintenance, make sure to change your air filter on a regular basis. Poor airflow as a result of a large number of supply vents being closed or obstructed. To my customers, I always urge that they keep all of their supply vents completely open. The system is built to handle a set amount of airflow, and blocking these vents will result in a reduction in airflow, which may result in the problems stated below. Low or decreased airflow as a result of a duct that has collapsed someplace
- A faulty fan motor that is running at a lower speed because it will fail in the near future. In this circumstance, it is necessary to replace the fan motor.
Conclusion – Furnace Blower Fan Wont Turn Off
As you can see, the source of these troubles is a malfunctioning furnace control system. Some contain safety controls, such as those on a furnace, which can be hazardous if not properly managed. As a result, I always urge that you contact a qualified HVAC specialist to fully diagnose and treat the problem. Always use caution when using a furnace, even if it means temporarily disabling the safety controls. The vast majority of HVAC professionals are educated in furnace repair and are aware of these safety concerns as well as what occurs if the controls are disregarded.
Additionally, most HVAC technicians have replacement parts on their trucks so that they may fix the problem as quickly and effectively as possible.
We always recommend that you get your heating system serviced on a regular basis to ensure that it is operating appropriately and effectively.
Even so, flaws or prospective problems can be identified and corrected before they become a problem and cause a failure to occur.
This will eliminate a large number of faults that can arise and cause the furnace to malfunction. I hope this has been of assistance and that the problem has been resolved. Wishing you success and pleasant heating! The blower fan on my furnace would not turn off.
Furnace Blower Problem Video
Clearly, these are concerns with the furnace’s temperature control system. Some require safety controls, such as those on a furnace, which can be hazardous if not properly managed. In order to thoroughly evaluate and correct the problem, I always recommend that you bring in a professional HVAC technician. Always use caution when using a furnace, even if it means temporarily disabling the safety controls on the furnace. All furnace repair specialists are trained and knowledgeable about these safety concerns as well as what occurs if the controls are not properly maintained or operated.
- Most HVAC technicians also carry replacement components on their vehicles, allowing them to resolve problems quickly and effectively.
- Maintaining your heating system on a regular basis is usually recommended to guarantee that it is functioning properly and effectively.
- It is possible to identify and correct faults or prospective problems prior to their becoming difficulties and causing failure.
- Several problems that might arise and cause the furnace to fail will be avoided as a result of this.
- Congratulations and best of luck!
Why Does My Furnace Fan Keep Running?
Your furnace fan should only operate while your furnace is in the midst of a heating cycle if your thermostat is set to AUTO on your home thermostat. Having your fan operate consistently regardless of whether or not your furnace is heating is, however, not typical operation. So, what is it that is causing it to run indefinitely? As a result, if your furnace blower fan will not turn off, you may be experiencing one of the following issues:
- You’re using the wrong fan setting on your thermostat. The “manual override” setting on your fan limit switch is selected. a thermostat wire has been damaged by a short
- There is a shorted wire at the fan limit switch
- This is causing the problem.
We’re aware of the situation. That’s a lot of potential issues to deal with. Do not worry, we will guide you through simple troubleshooting procedures so that you can identify the source of your problem. We’ll also notify you if and when you’ll require the services of a professional to resolve the issue. Do you live in the Phoenix region and require immediate assistance? Simply call us and we’ll dispatch an expert to your location as soon as possible.
First, check your thermostat settings
This is something we’re all familiar with. All of these difficulties might arise at the same time. Never fear; we will lead you through some troubleshooting methods to help you identify the source of the problem.
Besides that, we’ll notify you if a professional is required to resolve the issue. Need a tech right away if you live in or around Phoenix, Arizona? We’ll send a professional over to you as soon as you contact us.
Second, troubleshoot for fan limit switch problems
Fan limit switches are positioned immediately under the hood of your furnace and are in charge of controlling when the furnace blower is turned on and off. After the burners are hot, a probe within the switch checks the temperature of the burner assembly, allowing the fan to be turned on and the fan to be turned off when the burners have cooled (when the thermostat stops calling for heat). Source However, if your furnace fan will not turn off, you may be experiencing one of the following problems with your furnace fan limit switch:
- The switch has been set to manual override
- However, this is not necessary. The switch is defective, and it must be rewired or replaced immediately.
To establish which of the issues listed above is the source of your problem, use these troubleshooting steps: 1.Find the fan limit switch and make sure that the white knob (as seen in the photo below) is firmly pressed in. If this is the case, your switch is in manual override mode, sometimes known as “always running” mode. Source 2.Remove the white button from the fan limit switch to return it to AUTO mode. In this case, the fan will automatically switch on while the furnace is heating up and turn off when the need for heat is no longer present.
Unfortunately, you’ll have to hire a professional to take care of both of these issues.
Need help from a Phoenix tech?
To establish which of the issues listed above is the source of your problem, follow these troubleshooting steps. 1.Find the fan limit switch and make sure that the white knob (as seen in the photo below) is firmly pressed into the switch’s housing. The manual override or “always running” mode is activated on your switch if this is the case. Source 2.Unplug your fan limit switch by pulling out the white button on the back of the fan. In this case, the fan will automatically switch on while the furnace is heating up and turn off when the need for heat is no longer felt.
Unfortunately, a professional will be required to resolve both of these issues.
Related reading:
- Among the most common furnace issues seen in Phoenix, AZ is a furnace that won’t turn on. An AZ Tech provides an explanation
Furnace blower motor won’t turn off
I’ve learnt not to argue with Tester about his statements since doing so is harmful for one’s reputation in this area of the globe. I will not declare that he or she is incorrect in this response. I will not be offended if you simply ignore this response or ignore it completely. – WARNING -I have always written too many words and used too much information in my work, and I will continue to do so. Even my own warning was excessively long. Having said that, I present this only as data to demonstrate how Tester may have arrived at his or her opinion and to provide some background knowledge to the reader.
- Please let me know if anything I write appears to be beneficial but also perplexing, and I will try my best to clarify my reasoning.
- – Home HVAC management has become more sophisticated than it should have been as more features were added to the system – such as air conditioning, heat pumps, and two-stage heat – and more control cables were added to the system.
- Some cables have become redundant as a result of this, and there is no standard for wire colors, which is one of the downsides.
- As a result, there are two of each wire color.
- Don’t put your faith on terminal designations or ‘standard’ wire colors; don’t put your money on their being correct.
- – BrownG – Fan Power – BlackO or B – Electricity for the heat pump NoneS1S2 or Outdoor1 and Outdoor2 – Temperature Sensors that are not attached to the thermostat wires.
- Now, in response to Charlie’s question: I read ‘.
The statement demonstrates that this is the case. “When the situation calls for it, turn on the heat.” Remove the wire from the ‘G’ terminal of the controller in the furnace, starting with the ‘G’ terminal.
- If the fan stops, the fault is between the wire that was connected to the ‘G’ terminal and the wire that goes back to the low voltage (24 volts) transformer situated within the furnace
- If the fan continues to run, the problem is with the thermostat.
- The problem is between the wire that was connected to the ‘G’ terminal out to the thermostat, as well as between the wire that was connected to the low voltage (24 volts) transformer placed within the furnace
- If the fan stops, the problem is between the wires that were connected to the thermostat.
– 3, and the fan has stopped, reconnect the G wire to the furnace’s controller. – 4, and the fan has stopped, reconnect the G wire to the furnace’s controller. – 5, and the fan has stopped, reconnect the G wire to the furnace’s controller. The fan should restart as a result of this, which is what is expected. To complete this step, proceed to the thermostat and disconnect the wire from the G terminal. Proceed to step 4- 4, and so forth. A short between the wires that were attached to the G terminal on the thermostat and the wire that was attached to the G terminal on the controller in the furnace is the cause of the fan not turning on properly.
- It is more likely to have occurred in an area where the wire is tightly wound.
- Short circuiting will occur rather than a broken wire; a broken wire would cause things to stop and not continue to operate; a short will occur instead.
- This is due to the fact that it is highly improbable that the short would have occurred on the jacketed portion, and it does not appear to have affected any other wires.
- If you discover a short, you may either separate the wires and apply some tape to them, or you can utilize another wire if you have one available in the cable.
- – 5.
- If you cut a wire, the fan will come to a halt.
- Unless all of the low-voltage connections are disconnected, the fault is most likely with the controller, or anywhere between the fan harness and the fan itself.
- Alternatively, and this is quite uncommon, demonic possession.
- Either the motor or the’module’ might be the source of the problem.
- It is likely that the fault is with the controller itself if the fan ceased working when the controller was removed.
– If it is still not working, please contact us. Then it’s time to get the party started. But honestly, if you have any questions, please let me know and we will go to work on addressing this problem. Wishing you the best of luck.
Why Won’t My AC Fan Turn Off?
– 3 After the fan has stopped, reconnect the G wire to the furnace’s controller. – 4 After the fan has stopped, reconnect the G wire to the furnace’s controller. – 5 After the fan has stopped, reconnect the G wire to the furnace’s controller. The fan is expected to restart as a result of this. To complete this step, proceed to the thermostat and disconnect the wire from the G terminal on the thermostat. Proceed to step 4- 4, and so forth. A short between the wires that were attached to the G terminal on the thermostat and the wire that was attached to the G terminal on the controller in the furnace is the cause of the fan not turning on.
- If the wiring is too tight, it will most likely have happened there.
- Short circuiting will occur rather than a broken wire; a broken wire would cause things to halt and not continue to operate.
- Due to the fact that it is highly improbable that the short occurred on the jacketed portion and that it does not appear to have affected any other wires, this conclusion is reached.
- You may either separate the wires and apply some tape to them, or you can utilize another wire if there is one available in the cable to make up for the short.
- The wires should be removed one at a time from the controller terminals, starting with the red ones and progressing to the black ones.
- When connecting that terminal on the controller to the transformer, the problem occurs.
- It is possible that a short to ground exists between the fan harness and the controller and that the fan continues to function despite being disconnected.
- The fan motor is state-of-the-art if it has more than three wires, in which case it is an electronic-controlled fan motor.
- You will thank me later if you replace both pieces.
- Make sure to properly replace and reconnect all of the cables before continuing on your way.
– It is still not working if you do not follow the instructions. Once this is accomplished, it is ready to begin drinking alcoholic beverages. In all seriousness, please notify me so that we can begin working on a solution. Congratulations and best wishes.
Why won’t your HVAC fan turn off?
In conjunction with the rest of your heating and cooling system, your HVAC fan should turn on and off. Normally, the fan will turn on a few minutes before heating begins and will remain on for a few minutes after cooling has ended, but your fan should not operate continuously for several hours. This isn’t always a terrible thing for your fan, but it is typically an indicator of a more serious problem with it. Defective thermostats, faulty wiring, and jammed relays are all common causes of fans not shutting off when they should.
How your fan normally works.
In conjunction with the rest of your heating and cooling system, your HVAC fan should turn on and off as necessary. Normally, the fan will turn on a few minutes before heating begins and will remain on for a few minutes after cooling has ended, but the fan should not operate continuously for several hours. Even though this isn’t always harmful to your fan, it is typically an indicator of a more serious issue with the unit. Failure of thermostats, improper wiring, and jammed relays are all common causes of fans not shutting off when they should.
Common fan issues.
Settings on the thermostat: Verify that your thermostat has been set to “on” rather than “auto.” Weather Conditions: If it’s really hot or cold outdoors, your HVAC system may not be able to keep your home at the temperature you want. Depending on whether your system is undersized or whether it has not been maintained, this may occur. In such event, it will continue to operate until the outside weather conditions improve. A broken thermostat may be to blame if you notice that both the fan and either the cooling or heating systems are operating unexpectedly.
In a similar vein, a short circuit or other wiring issue might be preventing the fan from receiving the on/off controls.
Fan maintenance.
Change Your Thermostat Settings: Check to check whether your thermostat is set to “on” rather than “auto.” Weather Conditions: If it’s really hot or cold outside, your HVAC system may not be able to keep your home at the temperature you want it to be at. A system that is undersized or that has not been properly maintained may have this problem. As a result of this, the machine will continue to operate until the weather outside improves. It’s possible that you have a malfunctioning thermostat if both the fan and either the cooling or heating system start running at the same time.
It is also possible that a short circuit or other wiring issue is preventing the on/off controls from being received to your ceiling fan.
Consult a professional.
A professional should be called as soon as possible if your furnace or air conditioner fan is consistently operating. The act of attempting to repair electrical faults on your own might result in further damage or possibly the creation of a fire danger. Contact Petro Home Services if you want a repair that is both safe and quick. We provide emergency furnace and air conditioning repairs, as well as routine furnace and air conditioning services and maintenance programs. Call us at any time, day or night, seven days a week.
Why Does My Furnace Fan Won’t Turn Off: Blower Keep Running
“Doesn’t that furnace ever come to a complete stop?” you inquire. “Yes, the furnace has ceased heating, but the fan will not turn off,” may be the response. “No, the furnace has stopped heating, but the fan will not turn off.” This is something that you may be experiencing in your house – or something that may occur in the future – and there are certain things you can do to address the issue if it does occur.
Why the Furnace Fan Won’t Turn Off
The following are the most typical reasons why the furnace fan continues to run. There are solutions provided. Some are straightforward. You might opt to call an HVAC specialist for some of the reasons listed above if the furnace fan won’t turn off depending on your level of handymanship.
Thermostat Fan Switch Set to ON
This is likely the most typical reason for the furnace fan to continue to operate after the heat has been turned off. It is also the most straightforward to locate and repair. There will be a different mechanism for controlling the fan on your thermostat that controls the furnace – and maybe the air conditioning as well.
- On manual thermostats, the fan will be controlled by a separate switch labeled “FAN.” On digital thermostats, there will be a menu choice named “FAN”
- On analog thermostats, there will be no such option. “FAN” will be a program function on Smart thermostats
- This feature will be called “FAN.”
You will be able to regulate the fan regardless of the type of thermostat you have installed. If it is set to “ON,” you have discovered the source of the problem that causes your furnace fan to continue to operate after the heat has been turned off. This is due to the fact that the “ON” option instructs the fan to operate continuously. What makes you think you’d want that? This is an option that allows you to utilize the fan to circulate air even when the furnace is not operating if you wish, for example, to keep debris and odors out of the air while the furnace is not working.
Changing the setting on your thermostat’s fan switch to “AUTO” will solve the problem.
This is the default option.
Shorted Thermostat Wires
Whenever the fan switch on your thermostat is turned to the “ON” position, a signal is transmitted to the fan, causing it to turn on. However, if the wires via which that signal is transmitted are shorted, the fan will continue to operate indefinitely, even if the switch is set to “AUTO.” In the case of a manual thermostat, it isn’t difficult to determine whether or not these wires are shorted within the unit. It is likely that you should contact a local HVAC specialist to identify and repair the problem if the thermostat is digital or smart.
They are almost all removed simply pulling them straight away from the wall, with only a little wriggling motion on the part of the user.
“R” stands for red, “W” stands for white, and so on.
You should pay close attention to the Red and Green wires in particular.
If they are in close proximity, gently separate them with the tip of a plastic pen or another tiny plastic or wood (not metal) item to give them some space. If you don’t notice anything that appears to be unusual in this area, replace the cover and contact your HVAC professional.
Defective Thermostat
The risk that your thermostat is faulty exists at all times, especially if it has been in use for a long period of time. Temperature controllers are available for purchase at your local hardware or large box shop in a variety of various types. Installation of a new one should be doable by anybody who knows how to use tools even a little amount of expertise. Make certain that the furnace’s electricity is turned off at the main breaker panel or at the switch on the side of the appliance. If you have central air conditioning, you should also turn off the electricity to it.
If you don’t feel confident in your ability to complete this task, just about any neighborhood handyman or HVAC specialist will be able to complete it swiftly and efficiently.
Fan Limit Switch Set to Manual Override
Your furnace’s front cover has a switch hidden underneath it, and you can find it here. It is responsible for allowing your furnace fan to turn on when the thermostat asks for heat and for shutting off the furnace if it overheats, as described above. Older furnaces will feature a manual override button that may be programmed to have the fan operate all of the time if necessary. It is unlikely that this button will be present on most contemporary furnaces, and it will not be possible to simply reset them.
The limit switch is often a silver-colored box that is positioned towards the top of the device and has a little white button on the side of it.
It should come out if you push it in a little bit more.
Faulty or Stuck Fan Limit Switch
It’s possible that the fan limit switch has simply failed and needs to be replaced. Due to the fact that the switch is continually exposed to high temperatures within the furnace while monitoring and protecting against overheating concerns, this can occur in any kind of furnace. Contact a local HVAC specialist to diagnose and repair the problem if you feel this is the cause of your blower motor fan not shutting off.
Other Reasons Furnace Fan Won’t Turn Off
There are a variety of additional reasons why your furnace fan may be unable to turn off, and only a qualified HVAC professional should attempt to resolve them. Some of these are as follows:
- Tripped flame rollout and low pressure gas switch due to blown 3 amp fuse
- Fan limit control set incorrectly due to blown 3 amp fuse
It’s understandable if they sound a little technical, because they are. That is why you should leave it to a professional to diagnose and repair any potential problems that may exist within your furnace.
What to Do if the Furnace Fan Won’t Turn Off
According to what you’ve seen so far, the reasons why your furnace fan won’t switch off might range from being very basic to pretty complex.
Before contacting with a reputable HVAC repair company, look through those first few issues that you might be able to resolve on your own. If those measures fail to resolve the situation, you may need to take that step.
When Your Furnace Won’t Shut Off Take These 3 Steps
The causes for your furnace fan not turning off can range from being very basic to rather complex, as you can see. Examine those initial few problems to see if there is anything you can do to fix them yourself before seeking professional assistance. You may need to make that decision if none of these options work.
Check Your Thermostat
If your furnace won’t shut off and you’re concerned, don’t get too stressed out. The first thing to do is to double-check the temperature setting on the thermostat.
- Inspect to see if your fan is set to On or Auto mode. It’s best to leave the fan turned on if it’s already on
- Otherwise, set it to Auto, which will turn it off when the temperature reaches the appropriate level. If you have your thermostat set to an exceptionally high temperature, your furnace may not be able to keep up. Any furnace that is set at a temperature higher than 80 degrees may struggle, especially in a large house or during cold weather. Finally, check to see if the temperature in your house is higher or lower than the temperature you specified. Having a reading below indicates that your furnace is working too hard and that you may have a blocked air filter. If it is higher than that, it indicates that something is more gravely wrong and that it is time to contact Aspire.
Check Your Air Filter
A clogged air filter is one of the most common causes of furnace failures. They assist in regulating the furnace’s air supply, and if they get blocked, they can cause your furnace to work more harder than it should.
- When your furnace is turned on, the return ducts begin to draw in air from your home, which is then heated. Dust, dirt, and other particles are removed from the air by passing it through the filter in the return ducts. A blocked filter stops your furnace from receiving the proper amount of air supply it requires. When this happens, it attempts to make up for it by working longer hours — but as the filter grows more clogged, this becomes less efficient.
This article provides some practical advice on how to change your filter. (The filters in different types of furnaces are located at different locations.) At the absolute least, you should inspect or replace your air filter every three months. Replace your furnace’s filter and wait an hour to watch how it reacts to the change. If the situation continues, it’s time to make a decision about what to do.
Call the Professionals
Change your filter with the aid of this article, which includes some useful hints. Filters are located in various locations depending on the kind of furnace. Once every three months or so, you should inspect or replace your air filter. Wait an hour to watch how your furnace reacts after changing your filter. The moment has come to make a decision if the situation remains.
Posted Under:Resources
In the event that your air conditioner refuses to shut off, it’s reasonable to be concerned about squandering electrical power when temperatures get too chilly for comfortable operation. Your air conditioning system may be malfunctioning if it continues to run and never seems to shut off. This could be due to a number of factors, including frozen evaporator coils, clogged air filters, a bad electrical switch that needs to be replaced, a fan that blows constantly, dirty condenser coils, a bad thermostat, or another problem with yourHVAC system.
Williams Comfort Air outlines the causes of your air conditioning unit’s inability to shut down and what you can do to resolve the issue.
Is It Ok for an Air Conditioner to Run All Day?
In the event that your air conditioner refuses to shut off, it’s reasonable to be concerned about squandering electrical power when temps get too chilly for comfortable living. Your air conditioning system may be malfunctioning if it continues to run and never seems to shut off. This could be due to a number of factors, including frozen evaporator coils, clogged air filters, a bad electrical switch that needs to be replaced, a fan that blows constantly, dirty condenser coils, a faulty thermostat, or another issue with yourHVAC system.
Williams Comfort Air outlines the causes of your air conditioning unit’s inability to shut down and what you can do to resolve the situation.
If your air conditioner requires repair services from a qualified expert, please call us to arrange an appointment or to seek an emergency cooling repair service.
Why Is My Air Conditioner Not Turning Off?
If your air conditioner does not shut down as planned, it is possible that one or more of the following problems exists inside your HVAC system.
Electrical Issues
A variety of electrical components are used in the operation of air conditioners. A faulty relay switch causes an electrical circuit to remain closed, allowing the air conditioner to run continuously without interruption. When the compressor contactor is in the closed position, it can fuse, allowing the condenser unit to continue to operate at a steady power level. A stuck switch can occasionally be repaired, but more often than not, you’ll need to have a specialist replace the faulty switch on your behalf.
Faulty Thermostat
Thermostats should be updated about every ten years. Thermostat sensors accumulate dirt over time, which makes it difficult for them to reliably monitor the temperature of the room. Electricity wiring can be damaged, and wire connections can become loose, resulting in communication between the thermostat and the air conditioner being disrupted or lost.
Wrong Thermostat Settings
Replacement of thermostats is recommended every ten years. Thermostat sensors accumulate dirt over time, which makes it difficult for them to reliably monitor the temperature of the surrounding environment. Electricity wiring can get broken, and wire connections can become loose, resulting in communication between the thermostat and the air conditioner being disrupted.
Faulty Fan Limit Switch
However, even when the proper fan settings are selected, the fan motor may continue to spin even when the air conditioner is not in use. In this case, the fan limit switch is trapped in the override position, and the problem occurs. By resetting the limit switch, which is positioned near the blower fan, you will be able to prevent the fan from blowing until specifically instructed to do so by the thermostat.
Dirty CondenserCondenser Coils
However, even when the proper fan settings are selected, the fan motor may continue to operate even when the air conditioner is not in use. In this case, the fan limit switch is trapped in the override position, which is not desirable. It is possible to stop the blower fan from operating by resetting the limit switch, which is positioned near the blower fan.
Frozen Evaporator Coils
You may see warm or hot air streaming from your room vents even while your air conditioner is functioning. This is due to the evaporator coils in your indoor furnace or air handler unit being frozen. As a result of system problems, the evaporator coils may not get enough heat, resulting in condensation being drawn from the air and freezing on the coil’s surface during the refrigeration process. Having a covering of ice on the evaporator coils stops the refrigerant from receiving any heat energy from the surrounding environment.
If the condensate drop pan and drain line below your evaporator coil get blocked, moisture will be trapped inside the system, causing your evaporator coil to create a thick film of ice.
Dirty Air Filter
A clogged filter obstructs air flow through the system, resulting in a variety of difficulties as well as the inability of the air conditioner to shut off. When the air filter becomes clogged with pollutants, the air conditioner must cycle on and off in order to provide sufficient cooling for the home.
Low Refrigerant Levels
In order to provide proper cooling and maintain suitable inside temperatures, air conditioners are charged with specified refrigerant volumes. It is possible that refrigerant will escape from the system due to leaks in the refrigerant lines, broken coils, or malfunctioning components, resulting in a lack of refrigerant available to assist the air conditioner in absorption and transmission of heat. As a result of this weakness, the system will continue to run for hours on end in order to compensate.
Low Fan Speed
Unless the blower fan speed is set to a high enough level, the system will not be able to flow enough cold air into your residence. If this occurs, your air conditioner will continue to cycle while it makes an attempt to deliver cool air to your living space. Dirt and filth caked on the fan blades might cause it to run more slowly, limiting its ability to operate.
Incorrect System Size
Air conditioners are available in a variety of sizes, and proper fit is critical. When an air conditioning unit is too tiny or inadequate, it lacks the power necessary to reach the cooling temperatures you have chosen. Inefficient cooling results in a significant amount of electricity being consumed by the system. The unit will continue to operate for hours without providing a suitable temperature in the home, and it will do so until the entire unit is replaced.
What to Do When Your Air Conditioner Won’t Turn Off
It is incredibly crucial to have the right size air conditioner for your home. It is not possible to reach the desired cooling temperatures when an air conditioning unit is either too small or undersized for the room. Inefficient cooling results in a significant amount of energy being consumed by the system. After running for hours without providing a pleasant temperature in the house, the unit will continue to do so until the unit is completely replaced.
1. Adjust Thermostat Temperature Settings
Look at the settings that are set on your thermostat – if the set temperature is lower than the current room temperature, the air conditioner cycle will not be interrupted. Temperature should be set a few degrees higher than the present room temperature, which should cause the thermostat to activate and shut off the air conditioning system.
2. Adjust Thermostat Fan Settings
Look at the settings you have set on your thermostat – if the set temperature is lower than the current room temperature, the air conditioner cycle will not be interrupted. Temperature should be set a few degrees higher than the present room temperature, which should cause the thermostat to activate and shut off the air conditioning unit.
3. Eliminate Air Flow Restrictions
Remove any obstructions that may be preventing air from freely flowing through the system, which may cause the air conditioner to run for a longer period of time than is necessary.
Cleaning the outside condenser unit of dirt and debris is essential, as is opening all of the room supply vents around the house.
4. Clean the Blower Fan
A clogged blower fan impairs the ability of the cooling system to circulate cold air, forcing the system to operate continually in an attempt to cool the home, wasting energy. Remove any dust that is preventing the fan from operating properly by following these steps:
- The electrical power to the indoor unit should be turned off. Removing the blower compartment access panel is a good idea. Remove the screws that are holding the circuit board in place with your fingers. Maintain the connection of the wires and move the circuit board out of the way. The blower motor assembly should be gently pulled out of the cabinet once the screws keeping it in place have been removed
- Clean the fan blades with a gentle brush to remove any dirt that has accumulated. Remove any dirt from the blades and cabinet with a vacuum
- Install screws to hold the blower component in place in the cabinet once it has been properly repositioned. Reposition the circuit board and secure it in place using screws. Replace the access panel with a new one. Restore the unit’s power supply.
Call Williams Comfort Air For Air Conditioning Repair Service
The interior unit’s electrical power should be turned off. Removing the blower compartment access panel is a simple task. Take out the screws that are holding the circuit board in place and set them aside for later. Preserve electrical connections while moving the circuit board to a more convenient location. The blower motor assembly should be gently slid out of the cabinet once the screws that hold it in place have been removed. Clean the fan blades with a gentle brush to remove any dirt. Remove any dirt from the blades and the cabinet using a vacuum cleaner.
Replacing and tightening the circuit board is important.
The unit’s power supply should be restored.
Blower fan won’t shut off
Turn off the electricity to the interior unit. Remove the access panel to the blower compartment from the vehicle; and Take out the screws that are holding the circuit board in place and set them aside. Maintain the connection of the wires and move the circuit board out of the way; Removing the screws that held the blower motor assembly in place and carefully sliding it out of the cabinet will save time and effort. Remove any dirt from the fan blades using a gentle brush. Remove any trash from the blades and cabinet using a vacuum; Reinstall the blower assembly in the cabinet and tighten the screws in place.
It is necessary to replace the access panel.