Freezer Defrost Timer
- Defrost Timer Operation
- What does a Defrost Timer do?
- Defrost Timer Clicking
- Where are defrost timers used or located?
- Is there a separate defrost timer for the refrigerator and freezer?
- Freezer not defrosting
- Bad defrost timer causing clicking to be heard with grille in place.
The Defrost Timer advances the freezer system into and out of the defrost cycle.
- Defrost Timers are not used on refrigerators, only freezers.
- Depending on unit configuration the timer advances into the defrost cycle after the compressor accumulates a specified amount of run time.
- Example: After the compressor runs for 6 hours the unit enters defrost for 21 minutes.
- As the timer advances through different cycles it may make clicking noises.
- These noises should not be heard when the grille is in place.
- If the timer can be heard with the grill in place service should inspect the timer.
- The Defrost Timer is usually located near the condenser.
- Units with electric controls (600, 700, BI, 648PRO, NGI, UC) do not use a defrost timer, instead defrost cycles are controlled by the control board.
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