Worcester No Power / Dead Appliance

Boiler will not start at all, no lights or display, appears 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 3A fuse at fused spur, tripped circuit breaker, faulty Worcester main PCB, loose mains connection block

How to Fix / Troubleshooting

Safety first: Do not open the boiler casing unless you are competent. Mains voltage is present inside.

Homeowner checks:

  • Verify that the fused spur is switched on and the fuse (typically 3A) is intact; replace only with the same rating.
  • Check the consumer unit for tripped breakers or RCDs and reset if safe to do so.
  • Confirm that any external controls (room thermostat, programmer) have power and are calling for heat.

Engineer actions:

  • Check mains voltage at the boiler terminal block.
  • Inspect internal fuses on the Worcester PCB and replace if blown, investigating the cause.
  • Test the main PCB for signs of failure (burn marks, swollen components) and replace if necessary.

If fuses blow repeatedly, there is likely a short circuit that must be professionally diagnosed.

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Repair Difficulty

Medium 3/5

Required Part

Main Control PCB
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