How to Test a Chest Freezer Compressor How to Test a Chest Freezer Compressor

A chest freezer compressor is part of a system designed to freeze food to keep it fresh and prevent spoilage. The compressor presses together refrigerant gas to raise the pressure and temperature. Heat is taken outside the unit and released using the heat exchange coils attached to the freezer. The compressor is the component that actually "freezes" food and keeps it frozen. Because of the importance of this component, it is expensive both to buy and to repair. If your freezer is not working the way it should or food is not kept at the temperature you had set, the first thing you should do is to have your compressor checked out and tested. Follow the steps below to test your chest freezer compressor to determine whether or not it needs to be replaced.

Step 1 - Take Readings

Read the instruction manual of your chest freezer as not all appliances are the same. Consult the troubleshooting section to take the first steps in identifying the problem and solution.

Step 2 - Turn on Your Freezer

Plug in your freezer and check if its light functions or there is a sound coming from the fan or motor. If everything functions well, but your freezer is still having trouble, try to plug in any appliance that needs the use of electricity to function. If it works, examine your circuit breakers or fuse.

Step 3 - Check the Evaporator Coil

Remove the panel and take a look at the chest freezer’s evaporator coil to see if heavy frost has formed. If it has, this may be the reason why it is not cooling well. This is applicable for self-defrosting chest freezers. If your chest freezer is not of this kind and it’s not cooling well, then you must defrost it. Confirm if the temperature is in the right setting.

Step 4 - Identify the Noise Produce by your Chest Freezer

Activate your chest freezer, and listen carefully to the sound it is making. If there are noises coming from it, identify the source. If the sounds are coming from inside, it may be caused by a fan when the freezer door is opened and closed. If it’s noisier when open, then there is something wrong with your evaporator fan motor. This is an indication that it needs replacement.

If the noise is coming from the outside back of the appliance, then it’s either the compressor or the condenser fan. If it’s the compressor, you must change it. If it’s the condenser fan, a thorough cleaning may fix the problem

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