E18
Fairland
High Discharge Temperature Protection
Display shows E18; heater may not start after repeated short cycling.
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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
Blocked or dirty coil, Low water flow through titanium heat exchanger, Failing compressor, Faulty discharge temperature sensor
How to Fix / Troubleshooting
Safety: High refrigerant temperatures are involved; do not touch refrigerant lines immediately after shutdown.
User checks:
- Clean coil and ensure airflow: Remove debris and ensure at least the manufacturer’s recommended clearance around the Fairland unit.
- Verify water flow: Confirm strong flow through the heater by checking inlet/outlet valves and filter condition.
If E18 persists:
- A technician should measure discharge temperature, test the discharge sensor, and evaluate compressor and refrigerant circuit performance.
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Repair Difficulty
Hard
4/5
Required Part
Discharge Temperature Sensor
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