E18
Termet
External Control / Communication Fault
Display shows E18, heater may not respond to external control signals (e.g., remote controller or BMS).
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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
Incorrect wiring of Termet remote controller, Broken communication cable, Incompatible external control signal, Faulty communication interface on PCB
How to Fix / Troubleshooting
Safety: Disconnect power before altering control wiring.
- Check wiring diagram: Refer to the Termet installation manual and verify that external controls are wired to the correct terminals with correct polarity.
- Inspect cable: Look for damage to the remote controller cable. Replace if cut or crushed.
- Isolate external controls: Temporarily disconnect external controllers and reset the heater. If E18 clears, the issue is with the external device or wiring.
- Interface test: If E18 remains with all external controls disconnected, the PCB communication interface may be faulty and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Remote Controller / Communication Module
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