E4
GE
Evaporator Defrost Sensor / Thermistor Fault
Display shows E4 and the wine cooler may not defrost properly or may ice up around the evaporator.
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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
Failed evaporator thermistor, loose or corroded evaporator sensor connector, damaged wiring at evaporator area, defective control board defrost sensor circuit
How to Fix / Troubleshooting
Safety: Unplug the wine cooler and be prepared for water from melting ice.
- Access evaporator: Remove interior shelves and the rear panel inside the cooled compartment to expose the evaporator coil and attached thermistor.
- Defrost manually: If the coil is heavily iced, allow it to thaw completely using towels to catch water. Do not chip ice with sharp tools.
- Inspect sensor: Locate the evaporator thermistor clipped to the coil or nearby tubing. Check for broken casing, loose clip, or damaged wires. Reseat the connector.
- Test thermistor: Disconnect and measure resistance with a multimeter. Compare to GE’s thermistor chart at the measured temperature. Replace if readings are not within spec.
- Control board check: If the thermistor is good, inspect the control board for burnt components in the defrost circuit. Replace the board if necessary.
Reassemble, restore power, and monitor for proper defrosting and absence of the E4 code.
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Repair Difficulty
Hard
4/5
Required Part
Evaporator Thermistor
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