Worcester Bosch
No Power / Electrical Supply Fault
Boiler will not start at all, no display or lights on Worcester Bosch appliance.
Advertisements
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.
Advertisements
Possible Causes
Blown 3A fuse in fused spur, Tripped circuit breaker, Faulty boiler on/off switch, Internal fuse on PCB blown
How to Fix / Troubleshooting
Safety first: Do not open the boiler casing unless competent. Isolate power before checking fuses.
User checks:
- Confirm that the fused spur supplying the boiler is switched on and the fuse (typically 3A) is intact; replace only with the same rating.
- Check your consumer unit for tripped breakers or RCDs and reset if safe to do so.
Engineer actions:
- Test for 230V at the boiler terminals; if present but no display, check the internal fuses on the PCB.
- Inspect the on/off switch and wiring for continuity.
- Replace the main PCB if internal fuses blow repeatedly and no external fault is found.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Main Control PCB
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements