E12
Remeha
Communication Error Between Display and Main PCB
Boiler displays E12 and stops.
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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 communication cable between the user interface and PCB, Faulty display board, Faulty main control PCB, Electrical interference or power supply issues.
How to Fix / Troubleshooting
Safety first: Isolate the boiler from the mains before accessing the control panel.
- Power cycle: Turn off the boiler at the fused spur for 30 seconds, then turn it back on. If E12 persists, proceed with further checks.
- Check display connections: Remove the front panel and carefully inspect the ribbon cable or plug connecting the display and main PCB for loose or damaged connectors.
- Check mains supply: Ensure the boiler has a stable 230V supply and that there are no obvious signs of water ingress in the control area.
- Engineer tasks: Test the continuity of the communication cable, replace the display PCB or main PCB as required, and verify correct earthing and polarity.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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