If your Payne air conditioner fan is not working, start with the parts most likely to stop the fan from spinning. The most common cause is a failed dual shaft fan motor, also called the circulation fan motor, especially if the shaft is loose, the bearings are bound, or the blade will not turn by hand. A bad fan motor is next, and you can often confirm it by checking whether the blade spins freely and whether the motor is receiving power. If the Payne AC fan is not working even though the motor and fan motor capacitor test good, the relay board may not be sending voltage to the fan. A faulty temperature control thermostat or thermostat can also keep the fan and compressor from starting when cooling is called for. Less often, the main control board fails and stops powering the fan motor. Enter your Payne air conditioner model number on RepairClinic.com to find the exact dual shaft fan motor, fan motor, thermostat, relay board, main control board, or other replacement part that fits your unit.
01 - Payne Air Conditioner Dual Shaft Fan Motor
The dual shaft fan motor (or circulation fan motor) might be defective. The circulation fan motor has two fan blades: one on either side of the motor. On one side, the fan blade draws in outside air over the condensing coil to dissipate the heat. On the other side, the fan blade directs the air over the evaporator coil. The dual shaft fan motor has bearings that can loosen or bind over time. To determine if the motor bearings are defective, wiggle the motor shaft. If the motor shaft is loose, or if it won’t turn at all, replace the fan motor.
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Try turning the blade by hand. If the blade does not turn freely, this indicates that the motor bearings are worn out. If the motor bearings are worn out, replace the motor. If the blade turns freely, test the incoming power to the fan motor. If power is getting to the fan motor, but the motor won’t run, this also indicates that the motor is defective and should be replaced.
The relay board provides voltage to many components of the air conditioner, including the fan motor. If the relay board isn’t working properly, the fan might not run. Relay boards are often misdiagnosed; before replacing the board, make sure you check more commonly defective parts—particularly the fan motor capacitor and the fan motor itself. If you are certain that all of the other components are working properly, replace the relay board.
04 - Payne Air Conditioner Temperature Control Thermostat
The temperature control thermostat has electrical contacts that burn out over time. If the electrical contacts are burned out, the thermostat won’t work properly The fan motor should always be running when the compressor is on. If the compressor is running, but the fan motor is not running, the fan motor or the fan motor capacitor are likely at fault. If both the compressor and the fan motor won’t run, use a multimeter to test the temperature control thermostat for continuity. If the thermostat does not have continuity, replace it. (Note: Some thermostats may also control a heater and, as a result, will have three terminal...s. Refer to your air conditioner’s wiring diagram for more information.)
The thermostat monitors the temperature of the air. When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. If the thermostat is defective, it may prevent the fan from working. To determine if the thermostat is defective, set the air conditioner to cooling and then use a multimeter to test the thermostat for continuity. If the thermostat does not have continuity while the air conditioner is set to cooling, replace the thermostat. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. Refer to your air conditioner...’s wiring diagram for more information.)
The main control board provides voltage to all of the air conditioner’s components. If there is a problem with the control board, it might stop providing power to the fan motor. Control boards are often misdiagnosed; make sure you check more commonly defective parts before replacing the main control board. If you are certain that all of the other components are working properly, replace the main control board.