E18
Kospel
External Control / BUS Communication Fault
Heater shows E18; may be linked to external control or communication bus.
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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
Disconnected external control wiring, Shorted BUS lines, Incorrect polarity on communication terminals, Faulty external controller
How to Fix / Troubleshooting
Safety: Turn off power before working on control wiring.
- 1. Check external connections: Inspect any connected external controllers (e.g., room thermostats, BMS interfaces). Ensure wires are correctly landed on the Kospel BUS or control terminals.
- 2. Polarity and wiring: Verify polarity and wiring order according to the Kospel wiring diagram. Correct any reversed or crossed wires.
- 3. Isolate external devices: Temporarily disconnect external control wiring and restart the heater. If E18 clears, the issue is with the external device or cabling.
- 4. Cable integrity: Check for damaged or crushed control cables and repair or replace as needed.
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Repair Difficulty
Medium
3/5
Required Part
External Control Interface / BUS Terminals
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