Why Is My Air Conditioner Fan Not Spinning?
- Condenser fan motor failure
- Run capacitor is weak or has failed
- The dual run capacitor is defective
- Check the float switch
- The contactor may be faulty
- Check to make sure your breaker has not tripped
Symptom # 1
The condensing unit (outside unit) sounds like it is running, but the fan is not moving or moving slowly.
Possible reasons:
In this scenario, you know power is present because you can hear the compressor running.
If the fan motor is running slow, it is likely the run capacitor either is weak or has failed altogether.The run capacitor helps correct the "power factor" of the motor. It helps make the condenser fan motor more efficient.
Without the run capacitor in the circuit, the motor will still try to run and may spin slowly because it is now very inefficient - This is bad.
Shut the system off. Without the capacitor, in the circuit, the amp draw on the motor goes way up. This can damage the motor.
If the motor is still spinning albeit slowly, it is not moving enough air for your HVAC unit to function normally. Don't risk damaging your compressor.
**With the power off to your condensing unit, here is a simple test you can do. Take a stick or screwdriver and spin the fan blade.
If you can't turn it at all or if it's pretty stiff, it is likely your motor. If you can rotate the blade freely, there is a good chance it's your run capacitor.
Symptom # 2
Condensing unit is not working at all
The contactor is an electrical switch that breaks the high voltage to your condensing unit.
Obviously, if this part fails - no power to the air conditioning unit, nothing runs.
Float switch
The float switch isn't located at your condensing unit. It is actually at your air handler (inside unit).
The reason for this switch is to shut the unit down if the water stops draining to prevent damage.
Depending on how your system control voltage is wired this turns off the whole system or just the condensing unit.
If your air handler is horizontal, you should have two switches. Check both. One is the air handler near where the drain line exits. The other is in the secondary pan under the air handler.
If this pan has any water in it, remove the water, wet/dry vac or whatever means possible. Removing the water should reset the switch.
Make sure you clear the drain line otherwise it will just reoccur. If your air handler is vertical, most of the time the float switch is directly at the base of the unit.
If you do find it tripped, it would be best to shut the system off at the thermostat. Reset the breaker - then turn on AC at the thermostat.
Need a Professional A/C Technician?
Air Zero provides AC services in Largo Fl, St. Petersburg also Seminole, and Clearwater and all of Pinellas County. Give us a call at 727-392-6111.Tags
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