E4
Fagor
Defrost Heater Control Error
Display shows E4; freezer may run continuously or not reach set temperature.
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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
Shorted defrost heater, Stuck defrost relay, Control board triac failure, Wiring short to chassis
How to Fix / Troubleshooting
Safety first: Unplug the freezer. Be cautious of sharp metal edges and residual ice.
- Visual inspection: Access the evaporator area and inspect the Fagor defrost heater for burn marks or broken sections.
- Measure heater resistance: Disconnect heater leads and test with a multimeter. A very low resistance or visible short to ground indicates a problem.
- Check wiring: Inspect heater wiring for insulation damage where it passes through metal panels. Repair or replace damaged harnesses.
- Control board: If the heater and wiring are good, the defrost relay or triac on the control board may be shorted, causing improper defrost control. Replace the control board as an assembly.
- Professional help: Because this involves mains voltage and heating elements, consider using a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater
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