Immergas No Power / Electrical Supply Fault

Boiler does not start at all, no display or lights, completely dead.

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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, No mains supply to boiler, Faulty main switch, Failed PCB power supply section

How to Fix / Troubleshooting

Safety: Electrical work must comply with local regulations. Isolate the circuit before testing.

  • Check external supply: Verify that the boiler's fused spur or plug is switched on and that the fuse has not blown. Replace the fuse with the correct rating if necessary.
  • Test socket/spur: Use another appliance to confirm that the socket or spur has power.
  • Internal fuse (engineer): A technician should check and replace any blown internal fuses on the PCB after identifying the cause.
  • PCB replacement: If power is present but the boiler remains dead, the PCB power supply may have failed and require replacement.
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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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