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Photography By Tonelson / Getty Images
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Photography By Tonelson / Getty Images
Air conditioner systems have two fans: one inside that is connected to the air handler, allowing it to draw warm air from inside the home over evaporator coils to remove the heat, and one outside that is connected to the condenser to help disperse heat when it is released. If either one of these AC fans is not spinning, it can cause serious problems with the system.
If your AC fan is not spinning, learn why and how you can fix it.
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Tripped Circuit Breaker
A common reason behind the AC fan not spinning is a tripped circuit breaker. The system is connected to the electrical panel, allowing it to receive electricity as needed. However, if the AC unit overheats, there is a short in the system, or there's a power surge during a storm, then it can cause the circuit breaker to trip, cutting off power to the air conditioner.
This is easy to resolve by simply locating the AC unit circuit breaker on the electrical panel, then switching it back on. If the circuit breaker trips again, then you should have a professional electrician or an HVAC technician diagnose and repair the issue.
Broken or Obstructed Fan Blades
The AC fan may stop spinning if the fan blades are broken or obstructed. If the fan is loose or there are any objects blocking the path of the fan blades, then when the fan spins, it can hit the inside of the AC unit, nearby internal components, and any physical obstructions.
This impact can cause the fan blades to break, but if the fan blades hold up, they may simply be obstructed, preventing the fan from operating normally. If the obstruction is not removed, the motor and capacitor may burn out.
Beyond visible problems, like a stick or branch obstructing the fan blades, you should leave this type of repair to the pros. Not only will they have proper replacement parts, but they will be able to address the problem safely and more efficiently.
Failed Capacitor
A failed capacitor means the fan will no longer work properly. Capacitors are small, cylindrical parts of the AC unit that send energy signals to the motor and keep the motor going once it is running. However, capacitors can fail over time, and will need to be replaced.
Some DIYers with experience repairing AC systems may be able to complete the capacitor replacement on their own, but in most cases you will want to contact an HVAC technician to replace the failed capacitor.
Worn Out Compressor
A compressor switch is designed to send electrical voltage to the fan and condenser units, providing them the power needed to operate, but if the compressor unit is worn out, then it will not operate properly. This can lead to the AC fan and the entire AC unit no longer working.
You can fix this issue by replacing the worn out compressor. However, it's best to hire an HVAC technician.
Burnt Out AC Fan Motor
There are many reasons why an AC fan motor may burn out, such as over use, poor maintenance, or an obstruction that is preventing the fan from operating properly. Once the fan motor burns out, the fan will not longer be able to spin.
HVAC technicians can fix this problem by replacing the fan motor and inspecting the unit for any further issues, though this repair is expensive. If the AC unit is approaching a decade of use, then it may be time to upgrade the system, instead of just replacing the fan motor.
Broken Belt
A cracked, broken, or loose AC belt can prevent the AC fan from spinning. This is a common problem with older AC condenser models, though it's usually caused by simple wear and tear.
Contact an HVAC technician to have the broken belt replace and restore the functionality of the air conditioner fan.
Clogged Air Filter
If your air filter is not regularly cleaned or replaced, then it can accumulate dirt, dust, and debris, which puts a lot of strain on the AC unit fan. If you don't clean or replace the filter, the motor can burn out and the fan might stop working completely.
Replacing the air filter is relatively easy for a beginner DIYer or a professional HVAC tech, but if you wait until the motor burns out, you will have to deal with a significantly more expensive repair.
Frequently Asked Questions
How do I reset my outside AC fan?
To reset the outside AC fan, check the manufacturer's manual for where to find the reset button your model. This button is typically red, has a clear 'reset' label, and can be found on or around the AC unit. When you find the button, press and hold it for about three seconds. The AC should beep then reboot immediately.
Is the outside fan supposed to run while the AC is on?
The outside AC fan is designed to operate with the rest of the HVAC system. It will turn on when the AC is on and will turn off when the AC is off. If the fan doesn't turn on or won't turn off, have a professional diagnose and repair the problem.
When should the AC fan turn on?
As long as the fan is working properly, it should turn on at the same time as the rest of the heating and cooling system. When the thermostat indicates the temperature inside is too high, the HVAC system, including the AC fan, will turn on to reduce the temperature to the set level.
Read Next: How Much Does It Cost to Install Central Air?
Read the original article on The Spruce.
