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Thermal Zone Air conditioner fan not working

If your Thermal Zone air conditioner fan is not working, start with the parts most likely to stop the blade from spinning. On many units, the dual shaft fan motor is the first suspect because its bearings can loosen or bind, preventing the fan blades from moving air across the condenser coil and evaporator coil. If the blade will not turn freely by hand, or the air conditioner fan motor is not running even though it has incoming power, the fan motor is likely defective. If the motor checks out, the relay board may not be sending voltage to the fan. A faulty temperature control thermostat or thermostat can also keep the fan from starting, especially if there is no continuity when the unit is set to cooling. Less commonly, the main control board may fail to power the fan motor. Before replacing boards, confirm the fan motor and fan motor capacitor are good. Enter your Thermal Zone model number on RepairClinic.com to find the exact replacement part that fits your specific air conditioner.

01 - Thermal Zone 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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02 - Thermal Zone Air Conditioner Fan Motor

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.
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03 - Thermal Zone Air Conditioner Relay Board

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.
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04 - Thermal Zone 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.)
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05 - Thermal Zone Air Conditioner Thermostat

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.)
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06 - Thermal Zone Air Conditioner Main Control Board

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.
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Frequently Asked Questions

Why is my Thermal Zone air conditioner fan not working?
Why is my Thermal Zone AC fan not spinning when the compressor is running?
How do I know if the Thermal Zone air conditioner fan motor is bad?
Can a thermostat problem make my Thermal Zone air conditioner fan motor not run?
Should I replace the relay board or main control board if my Thermal Zone AC fan is not working?
How do I find the right Thermal Zone air conditioner fan motor or thermostat?

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