CTC
No Power / Dead Boiler
Boiler does not start at all; no display or lights on the control panel.
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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
Tripped circuit breaker or blown fuse, Faulty mains switch or spur, Loose mains wiring at boiler, Failed main PCB power supply
How to Fix / Troubleshooting
Safety: Only qualified persons should work on mains electrical circuits. Always isolate before removing covers.
- Check external power: Verify that the boiler's fused spur or circuit breaker is switched on and that the fuse has not blown.
- Test socket/spur: Plug in another appliance to confirm the supply is live.
- Inspect boiler terminals (technician): Remove the front cover and check that live, neutral, and earth are correctly connected and tight at the CTC boiler terminal block.
- Check internal fuses: Test and replace any blown internal fuses with the correct rating.
- Replace PCB (technician): If supply and fuses are OK but the boiler remains dead, the main PCB power section may have failed and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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