No, it is not normal for an air conditioner fan to keep running after being turned off. When you turn off your air conditioner, both the compressor and the fan should stop running. If the fan continues to run, it could indicate a problem with the fan motor, the thermostat, or the control board.
Here are a few possible reasons why the fan might keep running:
Faulty thermostat: The thermostat controls when the air conditioner turns on and off. If the thermostat is defective or not calibrated correctly, it might not send the signal to shut off the fan when you turn off the AC. Consider checking the thermostat settings or contacting a professional to inspect and potentially replace the thermostat if necessary.
Stuck relay switch: Air conditioners often use relay switches to control the operation of various components, including the fan. If the relay switch responsible for turning off the fan gets stuck or malfunctions, the fan may continue to run even when it should be off. A technician can diagnose and repair any faulty relay switches.
Defective control board: The control board is the "brain" of the air conditioning system, managing various functions and signals. If the control board is defective, it may not properly communicate the signal to shut off the fan. A professional HVAC technician can assess the control board and replace it if necessary.
It is recommended to have a qualified HVAC technician inspect and diagnose the issue if your air conditioner fan keeps running after being turned off. They can identify the specific cause and make the necessary repairs to ensure proper functioning of your AC system.