F4
KitchenAid
Defrost Sensor or Heater Circuit Error
Display shows F4; defrost performance is poor and frost may accumulate.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open defrost heater, Failed defrost thermostat, Open defrost sensor, Wiring harness issue in defrost circuit
How to Fix / Troubleshooting
Safety first: Unplug the freezer before accessing the evaporator or defrost components.
- Step 1 – Inspect evaporator: Remove the rear interior panel and check for heavy frost buildup.
- Step 2 – Manual defrost: As a temporary measure, unplug the unit and allow all ice to melt. Protect floors with towels.
- Step 3 – Visual inspection: Examine the defrost heater and thermostat for obvious damage or disconnected wires.
Further testing of the heater and thermostat with a multimeter is required to identify the failed part. This is typically a technician-level repair.
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Repair Difficulty
Professional Required
5/5
Required Part
Defrost Heater
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