E12
Nibe Internal Communication Fault

Boiler shows communication error between main PCB and user interface or between boiler and Nibe accessory module

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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 low-voltage communication cable, Faulty Nibe control panel, Defective main control PCB, Incorrectly wired Nibe accessory (e.g., mixing module)

How to Fix / Troubleshooting

Safety first: Isolate power before touching any internal wiring.

  • Power cycle: Turn off the boiler at the isolator for 30 seconds, then restore power to clear transient communication glitches.
  • Check display connections: If accessible, ensure the ribbon cable or plug between the display panel and main PCB is firmly seated.
  • Inspect accessory bus: For systems with Nibe mixing modules or additional circuits, verify that bus cables are correctly connected and not damaged.
  • Professional diagnosis: If the error persists, a technician should test the Nibe control panel and main PCB and replace the faulty module.
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Repair Difficulty

Hard 4/5

Required Part

Nibe Main Control PCB
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