E4
Della Marta
Defrost Sensor or High-Temperature Protection Fault
Display shows E4 and the compressor or Peltier module shuts down shortly after starting. Unit may beep.
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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
Defrost sensor NTC open/short, Overheat sensor on compressor or heat sink tripped, Sensor wiring harness damage, Main control PCB misreading sensor
How to Fix / Troubleshooting
Safety: Unplug the unit and allow any ice buildup to melt before working near the evaporator.
- Defrost sensor check: Access the evaporator area by removing the interior rear panel. Locate the defrost sensor clipped to the evaporator or defrost heater. Ensure it is firmly attached and not encased in heavy ice.
- Thaw ice: If the evaporator is heavily iced, leave the door open and unit unplugged for several hours or use a hair dryer on low, keeping it away from plastic parts and wiring.
- Inspect wiring: Follow the defrost/overheat sensor wires to the control board. Repair any damaged insulation and reseat connectors.
- Sensor replacement: If the sensor appears swollen, cracked, or tests open/short, replace it with the correct Della Marta defrost/overheat NTC sensor.
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Repair Difficulty
Hard
4/5
Required Part
Defrost / Overheat NTC Sensor
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