Boiler shows power supply or mains frequency error, intermittent resets

Safety first: Isolate power before tightening any electrical terminals. Only work on electrics if you are competent and local regulations allow.

• Check other appliances: If lights flicker or other devices reset, contact an electrician or your power provider.
• Inspect isolator and plug: Ensure the boiler’s fused spur or plug is secure and not overheating or discoloured.
• Dedicated circuit: Where possible, the boiler should be on a dedicated circuit to avoid interference from large motors or heaters.
• Technician diagnosis: A Nibe technician can test the internal power supply board and replace the Nibe power module if it is unstable.