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Freezer not working, clicking sound

01 - Freezer Start Relay

The start relay provides power to the compressor. If the start relay isn’t working properly, the compressor may run intermittently or not at all. If the compressor won’t run, the freezer will not cool. To determine if the start relay is defective, unplug the freezer and remove the start relay from the compressor. Use a multimeter to test the start relay for continuity between the start and run terminals. If the start relay does not have continuity, or if it smells burnt, replace it.
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02 - Incoming Power Problem

If the power cord prongs are burnt, and not making a good connection in the wall outlet, the power cord and the wall outlet should be replaced. The wall outlet will need to be replaced by a licensed electrician. If the voltage to the freezer drops below 105 volts when the compressor is starting, call the electric utility. When this happens the compressor may struggle to start and possibly burn out the compressor windings. The voltage can be checked with a multimeter when the compresser is starting.
Top Solution

03 - Freezer Fan Blade

A damaged evaporator fan motor or condenser fan motor fan blade will greatly reduce the air circulation needed to allow the freezer to operate correctly. Inspect the fan blade for any visible damage and confirm it can rotate smoothly on the motor shaft. A damaged fan blade will need to be replaced. Be aware that if the blade does not rotate smoothly, the fan motor may need to be replaced as well.
Highly Likely

04 - Freezer Compressor

The compressor is a motor which compresses the refrigerant and circulates the refrigerant through the evaporator and condenser coils. Use a multimeter to test the continuity between the electrical pins on the side of the compressor. If there is an open circuit, the compressor is defective. If the compressor is defective, it must be replaced by a licensed technician. If the compressor does not appear to be defective, test the start relay and run capacitor. If the start relay or run capacitor are defective, they will prevent the compressor from running.
Highly Likely

05 - Freezer Run Capacitor

If the run capacitor is defective, the compressor will be unable to cycle on resulting in the freezer not working. You can test the capacitor with a multimeter to determine whether it's functioning correctly or not. If the run capacitor is bulging or leaking, replace it.
Less Common

06 - Freezer Control Board

If a freezer is not working, but you're hearing a clicking sound, you should confirm that power if getting to the compressor. If no power is reaching the compressor, it's likely the control board is defective. However, control boards are often misdiagnosed—before replacing the control board, first check more commonly defective parts. If you have determined that all of the other components are working properly, replace the control board.
Uncommon But Possible