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Customer Questions and Answers for Defrost Bimetal by Whirlpool

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Manufacturer Part
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)

1 Answer

Hello Arkabee. No, there is no heater by the icemaker. Make sure the door is sealing properly and the gasket is good. if not, it can cause the ice to build up. You will need to replace the gasket 2188461A if it is bad. Hope this helps.

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1 Answer

Arkabee, There is no heater for the inlet tube. You need to consider repalcing the icemaker fill valve WP2315576 and check and seal the water inlet grommet(on the back of the refrigerator)with a caulking compound or sealant. Thanks and Good Luck

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Long for Model Number ET1MTEXLQ02

Hi I seem to have a problem with a defrost system because ice collects around the heater and blocks all the vent. First I check the heater with ohm meter ,it does show I have a continuity. Then I check the bimetal defrost and it does show I have a open circut. I order new bimetal defrost replace it. I still have a same problem with ice after 2 weeks ice will collected around the vent. *How many ohm for the heater? . The timer where it is located?

1 Answer

Hi Long. The timer is actually called a Adaptive Defrost Control Board that monitors much more than defrost. They have upgraded these boards lately so they are better. This part # is WP2304099. It is located in the controls on the left side of the cabinet. The defrost element ohms out to 11-28 ohms as long it is not open. If you tested the bimetal while it was room temperature and found it closed you need to replace it with part # WP4387503. Thank you.

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1 Answer

Hello Freezer. You will need to cut the wires of the old bimetal and splice in the new bimetal WP4387503. Then the bimetal clips onto the copper line on the top of the evaporator assembly. Hope this helps.

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1 Answer

Lebron, Based on your information, and the information I have here, you're orderring the incorrect part. The defrost bi-metal has the brown and pink wires, but the yellow/red and gray wire attach to the liner heater bimetal 2253200 . Which one do you need ? Thanks.

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1 Answer

Hello Vern. The defrost thermostat clips onto the large copper tube at the top of the evaporator. Hope this helps.

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1 Answer

Hello Francis. What is the model number for your refrigerator so we can help you with this? Thanks.

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1 Answer

Hello E. Davis. You will need to test the heater WP2315530 and the bimetal WP4387503 and make sure they are good. They should read closed for continuity when cold. If one of these are open, they are bad. If they both are good, then you will need to replace the defrost timer WP2183400. It is located inside the control assembly. You will need to remove the screws holding the control assembly in place to access the timer. You can test the heater and bimetal with a multi-meter MA-DM1. Here is a link on how to use a multi-meter. Hope this helps. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

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1 Answer

You will need to check the drain assembly under the evaporator coils to see if it is stopped up. This can cause the problem your having.

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