Main No Power to Boiler Electronics

Boiler display is blank but fused spur is on

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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

Blown internal fuse on PCB, Faulty main PCB, Loose live/neutral connection, Faulty fused spur or wiring

How to Fix / Troubleshooting

Safety: Electrical work must be carried out by a competent person. Isolate power before removing covers.

  • Check fused spur: Verify the switch is on and the fuse is intact; replace with the correct rating if blown.
  • Test another appliance: Plug a lamp or tester into the same supply to confirm power is present.
  • Engineer tasks:
    • Check incoming voltage at the boiler terminals.
    • Inspect and replace any blown internal fuses on the Main PCB (using identical type and rating).
    • Replace the Main control PCB if it does not power up with correct supply.
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Repair Difficulty

Medium 3/5

Required Part

Main Control PCB
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