If your air conditioner is not coming on after you replaced the condenser fan motor, there could be several reasons for this issue. Here are some common troubleshooting steps to help you identify and resolve the problem:
Electrical connections: Check the electrical connections to ensure they are properly connected and secure. Double-check that you've reconnected all the wires correctly and that no wires are loose or damaged during the motor replacement.
Capacitor: The condenser fan motor typically relies on a capacitor to start and run. If the capacitor is faulty or not connected correctly, the fan motor might not function. Test or replace the capacitor if needed.
Power supply: Make sure that power is reaching the air conditioner. Check the circuit breaker or fuse box to ensure that the breaker for the AC unit is not tripped or that the fuse is not blown. If it is, reset the breaker or replace the fuse.
Thermostat: Check the thermostat settings to ensure that it is set to "cool" mode and that the temperature setting is below the current room temperature. Sometimes a simple adjustment of the thermostat settings can resolve the issue.
Safety switches: Some air conditioners have safety switches on access panels or doors. If any access panel or door is not correctly closed, the safety switch might prevent the unit from turning on. Ensure all panels and doors are securely closed.
Contactor: The contactor is an electrical switch that controls the flow of power to the compressor and condenser fan motor. If the contactor is faulty, it may not engage, preventing power from reaching the fan motor. Test or replace the contactor if necessary.
Motor wiring: Check the wiring between the motor and the contactor for any loose connections or damage. A damaged wire can disrupt the electrical flow and prevent the fan motor from working.
Motor Compatibility: Ensure that the replacement condenser fan motor is the correct model and is compatible with your air conditioner's specifications. Mismatched motors may not function properly.
If you have gone through these troubleshooting steps and the issue persists, it might be best to contact a professional HVAC technician to diagnose and repair the problem. They will have the expertise and tools to identify the exact cause of the issue and provide the necessary repairs.