Baxi Combi 80e Dead No Lights

Was called by a customer today as their Baxi Combi 80e was not working for either central heating or hot water. I expected to find that there was not enough water pressure in the boiler, but this was not the case. There was no lights lit on the front of the boiler so I checked that the fused spur was switched on and that the fuse was ok. The fuse was ok but a 13 amp fuse, so I swapped it for a 3 amp fuse.

I removed the cover on the boiler for the electrical connection and tested for power there. There was 240v across live-neutral and live-earth, and nothing untoward between earth-neutral. There was no power on the boiler side of the 2 amp fuse so this had obviously blown. Removing the PCB cover completely I could smell that the PCB had burnt out, and there was some black staining in the cover. Removing the PCB there was considerable damage to the underside of the PCB as can be seen below.

After replacing the internal fuse and PCB the boiler was working fine again

Disclaimer:

The works described in this blog are a record of work undertaken and should not be taken as guaranteed to solve your problem.

Work should only be carried out by persons qualified and competent to do so.