Zanussi
Defrost Control Failure
Freezer cools but never goes into automatic defrost; ice builds up behind rear panel on no-frost model.
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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
Defective main control PCB not initiating defrost, Faulty defrost sensor misreading temperature, Open defrost heater or thermostat
How to Fix / Troubleshooting
Safety: Unplug before accessing internal panels and electrical components.
- Confirm model type: Ensure your Zanussi freezer is a no-frost model with an automatic defrost system.
- Test heater and thermostat: As described in earlier entries, check continuity of the defrost heater and defrost thermostat/thermal fuse.
- Check defrost sensor: Measure the evaporator NTC resistance and compare to spec.
- Evaluate control board: If all defrost components are good, the main control PCB may not be triggering defrost cycles and should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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