BAXI 105e Please Help..getting very cold

nigeng

My baxi 105e Combi which has worked faullessly for 4 and a half years has stopped dead. and developed a leak to boot. Having looked at it the fuse in the wall switch and the fuse in the boiler have blown. Replaced the boiler fires up and they blow again... there is an obvious burning under the PCB so its fair to say the Board is shot.... I have ordered another and am braving the cold when I have found also a leak ... this is at the joint between the DHW pressure differential valve and the diverter manifold...the point where the two are held together by two grub screws.....I am quite capable of removing and replacing these or parts of these but could do with an idea of what is likely to be wrong to allow water to leak at this point and if it is possibly the cause of the pcb melt down. I see each of these items has a diaphram in them ??? Please please help me if you can...I am skint and couldnt face xmas in the cold

Dandirt

If you look in your owner manual "Installation and Servicing" it'll show you how to dissassemble that part on page 36. If you haven't got a manual you can download it free on the Baxi website.

I think it's an 'o' ring in there but if you go to your local spares place, Plumb Center or w.h.y. they will have an exploded spares diagram on screen so you can identify what you need - be sure to pick up a tub of silicone grease at the same time and lubricate the 'o' ring with that prior to reassembly.

The circuit board will be shot - they are a common replacement part and the newer ones are upgraded. I've installed about three or four hundred Baxi 105e and HE boilers and probably changed about fifteen circuit boards.

I pay about seventy quid plus vat for a board but that's trade account, the seal kit - probably another tenner.

cheers