15
Immergas
Communication Bus Fault
Error 15; unit indicates communication error between main control board and user interface/display.
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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
Loose display cable, Damaged communication harness, Faulty user interface board, Faulty main PCB
How to Fix / Troubleshooting
Safety: Disconnect power before accessing electronic components.
- Check display cable: Remove the front panel and verify that the low‑voltage cable between the display board and main PCB is firmly connected at both ends.
- Inspect cable for damage: Look for pinched, cut, or burnt sections. Replace the harness if damaged.
- Reseat connectors: Unplug and replug the connectors to clean contacts.
- Test: Restore power and see if the display initializes correctly. If error 15 remains, either the display board or main PCB may need replacement.
Note: Board replacement and configuration should be done by an authorized technician to ensure correct parameters.
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Repair Difficulty
Medium
3/5
Required Part
User Interface Board
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