A18
De Dietrich
Internal Communication Error (PCB to Display/Module)
Boiler shows A18, no operation, sometimes after power surge
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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
Faulty main PCB, faulty display board, damaged communication cable, electrical surge damage
How to Fix / Troubleshooting
Safety: Disconnect power before touching any electronic components.
- Power reset: Turn off the boiler for several minutes and then restore power to clear transient faults.
- Inspect communication cable: Check the low-voltage cable between the main PCB and the display or interface module. Reseat both ends.
- Check for moisture: Look for signs of water ingress on the electronics. If present, the cause of the leak must be fixed and boards may need replacement.
- Technician tasks: A De Dietrich technician should diagnose and replace the main control PCB or display board as required.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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