E4
SPT
Evaporator Temperature Sensor Fault
Unit displays E4 and stops; ice production halts and compressor may not run.
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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 or shorted evaporator thermistor, Thermistor dislodged from evaporator surface, Damaged sensor wiring harness, Faulty main control board thermistor circuit
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing internal components.
- Visual inspection: Remove the cover to access the evaporator (the cold metal grid where ice forms). Locate the small sensor (thermistor) clipped or taped to the evaporator tubing.
- Check placement: Ensure the sensor is firmly attached to the evaporator surface and not hanging loose. Reattach with aluminum tape or the original clip if necessary.
- Inspect wiring: Follow the sensor wires back to the control board. Look for cuts, pinches, or loose connectors. Reseat the plug on the control board.
- Test operation: Restore power and run a cycle. If E4 reappears quickly, the thermistor is likely defective.
- Replace thermistor: Order an OEM SPT evaporator temperature sensor. Unplug the unit, remove the old sensor, route the new sensor along the same path, secure it to the evaporator, and reconnect to the board.
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Repair Difficulty
Medium
3/5
Required Part
Evaporator Thermistor
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