Have had the boiler for 8 years now and its been nothing but hassel ,about 6 months ago when I used the hot water it would run hot then cold it would also make reving sounds called a plumber out who said it was the thermister gave him the money to get the part never to be seen again,since then it wont light just revs so I have no hot water or heating called another plumber who fitted a new thermister and it made no difference he scratched his head for a couple of hours and said he would contact glow worm took the manual with him that was 3 weeks ago if anyone has a idea what the problem could be as it's starting to get colder now thanks

Emma, October 2012

Hi emma you need a main pcb for a 38cxi. in the box is the pcb, a series of wiring diagram stickers, (you shouldnt need these ,unless the existing pcb is a very old type). not bad to change, be careful with the connections note where they go, which way around,fragile connections on the left of the board, it is a fit then switch on item, no problem.

oops, October 2012

hi thanks for replying this is exactly what its doing can you tell me how to fix it please

emma, October 2012

boiler fan (hunting) on off on off , no ignition. Main pcb 99%. Fan startup not ok . boiler wont work.

oops, October 2012