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For safety reasons, a modern furnace will not work if the furnace door is not completely closed. Some units have a switch that the door presses when it’s properly shut. If you notice the AC fan not working, it could also be caused by a problem with the compressor contactor. The unit's compressor switch sends electricity voltage to the fan and condenser unit. If there’s enough gas flow through the pilot, then the next step is to check the burner. It’s common for the burner holes to collect soot from previous use, especially if you’re running the heater around the clock.
The first thing you should check is that the manual gas valve is open. The gas valve handle should be parallel with the pipe that it’s attached to. The exhaust flue is the pipe that the inducer fan is connected to. When the inducer fan runs, it blows the toxic combustion gases through the exhaust flue. The exhaust flue leads to the outside of the house so the combustion gases don’t stay in your home. You may notice that the fan doesn’t run but the compressor does.
How to Reset a Furnace Fan
If that doesn’t fix the problem, schedule a service call. You may need more refrigerant, have a blockage in your drain pipe, or have a broken condensate pan. If you are satisfied that the thermostat settings are correct, check your power supply. Your AC system runs on electricity, and there are typically three locations you can check to be sure the issue isn’t with power to the system. First, locate your main breaker box panel and make sure the AC system circuit breaker hasn’t been tripped. The outdoor unit typically takes 220v power to operate and should be on its own circuit.
A dirty air filter causes all sorts of issues in a furnace. The airflow restriction from a dirty air filter will make your furnace run less efficiently. It’s basically like suffocating your furnace while it tries to heat your home. If your condenser unit is older, it may very well have a fan belt that links the fan to the motor. Belts are designed to slip on and off of their pulleys with ease, which makes them susceptible to depreciation over time.
Burnt Out Condenser Fan Motor
To troubleshoot, turn off the system at the thermostat as a safety precaution. A broken or damage fan blade can be dangerous if the system turns on while you are inspecting it. Once you have ensured the system is turned off, go outside to the outdoor unit. The condenser fan motor and fan are typically mounted at the top in the center of the unit and are usually visible through the fan guard or wire grill. If you discover a broken or damaged fan blade, keep the system turned off and contact a local HVAC professional for repair.
The evaporator coil sits inside your home within the air handler unit , pulling heat and humidity from indoor air as it passes through. The evaporator coil can freeze up as a result of indoor blower fan malfunction, low refrigerant charge, low outdoor temperatures, or other system malfunctions. The disconnect box is a small box located close to the condenser unit.
❌ Burnt Out Condenser Fan Motor
If you have exhausted your options, and still don’t know why the compressor fan isn’t rotating, take a hard look at the fan itself. Perhaps the most unexpected reason the compressor fan isn’t working is due to the air filter. HVAC air filters should be changed every one-to-three months.
The only solution is calling the company where you bought it from and asking if someone can come and repair it. To prevent all of the costs from a damaged condenser, you should keep a regular schedule for the maintenance of your unit. You can check the circuit and make sure it is working.
Air Conditioner Won’t Stop Running
The mere presence of a belt drive in your condensing unit means the system is old, and it’s time to think about upgrading your air conditioner. Newer versions of air conditioner units do not use belts; instead, they use direct drive components to automatically connect the fan and motor. Now you know potential reasons why your furnace fan isn’t working and how to troubleshoot and solve the problem. Remember that fixing the issue early is critical as left unchecked, furnace blower motor issues can transform into more serious problems. It’s a wonderful thing in the heat of summer when you can go inside and feel the relief from a hot, sticky summer day.
It’s the dead of winter and your furnace suddenly stops working. So you call the local HVAC company, but they are booked till next week. Bad contactors can become stuck in the open or closed positions. This means that if open, no other components will receive electricity. If your contactor burns out, it willrestrict the flow of electricityto the other components, causing a malfunction.
The #1 reason is a dirty air filter, but a tripping high limit switch can also be caused by blockages in the air ducts or a bad blower motor. If the first two steps above don’t work, then change your air filter. Some unit fans won’t blow if the AC filter is clogged because it literally can’t blow air through the filter and into your home. Make sure to change it regularly to avoid this issue and many others with your home’s air conditioning. If the AC fan is not working after changing the filter, move on to the next step. If you find your central air conditioner fan not spinning, thefirst thing to check is your HVAC circuit breaker.
The capacitors are linked to the fans, so the fans should work when energy flows through them. Without the motion of the fans, the air will not be moved properly, and thus the until will not cool your home. Check to see if the furnace circuit breaker has tripped. If it has, reset and allow time for a normal heating cycle.
Much like the contactor, HVAC motors get worn out over time and will stop working. The furnace condensate drain line is prone to clogging, just like air conditioners. The switch is a simple on/off switch that’s used to disable the gas valve during the summer. If the inducer fan is running and the exhaust flue is clear, the pressure switch will trigger closed and the furnace’s ignitor will light up. When sufficient airflow is detected through the exhaust flue, the pressure switch closes and allows the furnace to heat up. The furnace’s pressure switch is responsible for checking whether the inducer fan is working properly.
One capacitor starts the motor, and the other sends standard voltage to keep it running. Unfortunately, capacitors wear out with time and often need to be replaced before the end of the life of the air conditioning system. The capacitor’s job is to store power used to operate the fan motor in the condenser unit. Occasionally, these components fail which prevents the fan motor from receiving proper power as the system runs. Have your HVAC technician replace the capacitor and this fix should correct the outside AC fan not working. Look inside and see if any fan blades are bent, broken, or missing.
Air Conditioner Fan Not Working Inside
More than 90% of furnaces in use today are condensing furnaces that condense moisture in a special drain pan to ensure maximum heating efficiency. The condensate is held in a drain pan and drains out automatically. Additionally, the motion helps to generate air circulation in your rooms which is necessary to push cold air back into the furnace. Powered by electricity from the control board (not the home’s main supply), the motor begins to rotate, creating air motion within the blower chamber.
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