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HomeRepair HelpFrigidaire Central A/C RepairFrigidaire Central air conditioner won't turn on Repair
Frigidaire Central air conditioner won't turn on
When a Frigidaire central air conditioner won't turn on, the most likely cause is a failed transformer, which supplies the 24-volt control signal from the furnace or air handler to the thermostat and contactor. Next, a defective control board may prevent that signal from reaching the condensing unit or blower motor. If the thermostat display is blank, replace its batteries, when applicable. Then check for an incoming power problem, including a tripped circuit breaker, blown fuse, or power switch on the side of the furnace or air handler that is turned off. Less commonly, the wall thermostat or thermostat wiring may not be sending the cooling signal through the thermostat wire. A multimeter can help confirm 24 volts between the C and Y terminals, but work around the 240-volt circuit, disconnect box, fuse, and contactor is not a safe first-time DIY repair. Turn off power before inspecting anything, and have a qualified HVAC technician handle line-voltage testing or repairs. Enter your Frigidaire central air conditioner model number to find the exact replacement transformer, control board, thermostat, or other part for your unit.
01 - Frigidaire Central Air Conditioner Transformer
The furnace control board sends a low voltage signal of 24 volts to the thermostat. When the themostat cooling contacts close, a 24 volt signal is sent to the contactor coil, closing the high voltage circuit and sending power to the condensing unit components. Some furnaces have a separate transformer for the 24 volt circuit, so if the contactor is not receiving the proper voltage when the thermostat cooling contacts are closed, it's likely this transformer has failed and the component will need to be replaced.
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Highly Likely
02 - Frigidaire Central Air Conditioner Control Board
If the central air condensing unit contactor is not receiving 24 volts or power is not getting to the furnace blower motor, a possible cause is a defective furnace control board. While this is not a common problem, if all other potentially faulty components are working properly, the control board should be replaced.
Highly Likely
03 - Wall Thermostat Batteries
Most wall thermostats are either powered by an enclosed battery or by the furnace or air handler transformer. If the thermostat display is dead, you can remove the thermostat cover and look for replaceable batteries. Replace the batteries if needed and check operation.
Common
04 - Incoming Power Problem
Check to see if there is power to the furnace or air handler. One or more indicator lights on the control board should be illuminated. If there is no power to the furnace or air handler, check to see if a circuit breaker has tripped or a fuse has blown. Confirm the power switch on the side of the unit is turned on.
Common
05 - Frigidaire Central Air Conditioner Wall Thermostat
The furnace control board sends a low voltage signal of 24 volts to the contactor through the wall thermostat. When the contactor receives the signal from the wall thermostat, it closes the circuit, sending voltage to the condensing unit components. There should be 24 volts between the common (“C”) and yellow (“Y”) thermostat wire terminals on the furnace control board when the wall thermostat is in the cooling mode. You can check for this voltage with a multimeter. If voltage is not reaching the contactor, it's likely the wall thermostat is defective and will need to be replaced.
Less Common
06 - Frigidaire Central Air Conditioner Wifi Thermostat
The furnace control board sends a low voltage signal of 24 volts to the contactor through the WiFi thermostat. When the contactor receives the signal from the WiFi thermostat, it closes the circuit, sending voltage to the condensing unit components. There should be 24 volts between the common (“C”) and yellow (“Y”) thermostat wire terminals on the furnace control board when the WiFi thermostat is in the cooling mode. You can check for this voltage with a multimeter. If voltage is not reaching the contactor, it's likely the WiFi thermostat is defective and will need to be replaced.
Less Common
Frequently Asked Questions
Why is my Frigidaire central air conditioner not turning on?
How do I know if the thermostat or transformer is keeping my AC from turning on?
What should I check if my outside AC unit is not turning on but the furnace or air handler has power?
Can a tripped breaker, blown fuse, or dead thermostat cause an air conditioner not to start?
How do I find the correct Frigidaire central air conditioner replacement part?
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