The refrigerator’s compressor pumps refrigerant through the condenser coils and evaporator coils. Therefore, the test is best left to a trained professional. However, it can be a complicated procedure, which will depend on whether you have an adaptive defrost control board or a manual defrost timer. The defrost timer can be tested with a multimeter. Make sure to disconnect the refrigerator from the power source before accessing the defrost timer. Check the refrigerator’s manual for the location of the defrost timer for your specific model. On other models, it may be behind the control panel or require the bottom kick plate to be removed. On most refrigerators, you will need to access the temperature or thermostat control box inside the refrigerator. If the defrost timer is causing the rattling, it will need to be replaced to solve the issue.ĭepending on the model, the defrost timer can be located in several different locations. If the motor is failing, it may also make a scraping or ticking sound and cause a buildup of frost on the evaporator coils. Over time, the defrost motor that operates the timer may start making a rattling sound. It works by opening and closing internal contacts that control the electric current flowing to the compressor and the defrost heating elements. The defrost timer in your refrigerator shuts off the compressor and evaporator fan motors to rid the refrigerator of frost.
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