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W
c1
Moderate
Whirlpool · Refrigerators
Defrost Thermostat Open Circuit
Quick Answer
Error code C1 on your Whirlpool Refrigerators means: Defrost Thermostat Open Circuit. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
WRF555SDFZWRQA59CNKZWRS325SDHZWRS588FIHZWRT518SZFMWRX735SDHZ
Likely Causes
  1. Defrost thermostat (bimetal) has failed in the open position
  2. Wiring fault between the defrost thermostat and the main control board
  3. Excessive frost buildup on the evaporator indicating a previous defrost system failure
  4. Defrost heater burned out causing thermostat to remain cold and open
How to Fix It
1
Unplug the refrigerator and access the evaporator compartment behind the rear freezer panel
2
Check for excessive frost buildup on the evaporator coils, which indicates a defrost problem
3
Disconnect the defrost thermostat and test it with a multimeter; it should have continuity when cold (below 30 degrees F)
4
Inspect the wiring from the thermostat to the control board for breaks or loose connections
5
Replace the defrost thermostat if it does not show continuity when sufficiently cold
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Defrost thermostat (WPW10225581)
Defrost heater (WPW10292572)
Wire connectors
Related Error Codes
C2C3CFEFCC
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