Service mode shows F3; defrost operation is erratic.

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.

Possible Causes

Open or shorted evaporator thermistor, Thermistor not properly attached to evaporator, Wiring damage from ice or vibration, Control board sensor input failure

How to Fix / Troubleshooting

Safety first: Disconnect power and be cautious of sharp evaporator fins.

Locate evaporator thermistor: It is usually clipped to the evaporator tubing in the freezer compartment.
Check attachment: Ensure the thermistor is firmly clipped and making good thermal contact with the tubing.
Test sensor: Remove the thermistor connector and measure resistance at a known temperature. Replace if out of spec.
Inspect harness: Look for brittle or cracked insulation and repair or replace as needed.

Repair Difficulty

Medium 3/5

Required Part

Evaporator Thermistor

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