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Customer Questions and Answers for Defrost Bimetal by Whirlpool

4.89 (64)
By: Whirlpool
Part Number: OEM18027960
Manufacturer Part Number: WP4387503

The Defrost Bimetal is an OEM part for Whirlpool refrigerators. It acts as a safety thermostat that monitors and controls the temperature during the defrost cycle. This component ensures that the defrost heater turns off when the evaporator coil reaches a specific temperature, preventing overheating and potential damage.

Causes of failure may include a malfunction due to wear and tear over time, electrical failure, or damage from moisture and ice.  

Symptoms of a bad Defrost Bimetal include:

  • The refrigerator is constantly running without cycling off
  • Frost buildup on the evaporator coils, leading to reduced cooling efficiency
  • The refrigerator or freezer compartment is too warm
  • Unusual fluctuations in refrigerator temperature

This OEM Whirlpool part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper and some Kenmore models.

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Questions & Answers

For Whirlpool Defrost Bimetal (Part Number: OEM18027960)

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Sam L. for Model Number WSF26C2EXY02

I have this side by side. One day it stopped cooling. The compressor and the fan don't start. Check the fan separately and was running well. I thought it's the relay and capacitor so I bought a 3in1. Relay combo kit. Looks like does the same as before with the old relay, makes a short kick, and doesn't want to start. I did the service diagnostic mode and the only one looked different was the defrost heater/by-metal was on bimetal open. Is there something I should check other than the relay? Can it be something about the thermostat? Thanks

Answer

Hello Sam, The compressor, condenser fan, and the evaporator fan should all come on at the same time. The start relay has nothing to do with either fan motor. The only time I use a 3 in 1 device to see if a compressor that is not starting, will start and run with the extra kick of amperage. If anything is not running you should eliminate the wiring as a cause first then verify voltage from the board.

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Answered by AppliancePartsPros.com   |   Tuesday, September 1, 2020

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