E18
BWT
Defrost System Fault
Heater displays E18 and does not start compressor; fan may 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
Defective defrost sensor, Stuck defrost relay or valve (on reversible models), Control board defrost logic error, Ice buildup preventing proper sensing
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing internal components.
- Inspect for ice buildup: Check the evaporator coil for heavy ice. If present, allow the unit to thaw completely by turning it off for several hours.
- Check defrost sensor: Locate the defrost/coil sensor and ensure it is properly attached to the coil and wiring is intact.
- Clean coil: Remove debris and ensure good airflow to minimize icing.
- Power reset: After thawing and cleaning, restore power and test operation.
If E18 persists, the defrost sensor or control board defrost circuit may be faulty. A technician should test sensor resistance and board outputs.
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Repair Difficulty
Hard
4/5
Required Part
BWT Defrost / Coil Temperature Sensor
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