I have a Glowworm 50FF boiler. When the system is not calling for heat or hot water, ie. timer off and both motorised valves closed, the boiler will fire up and keep the water in the boiler/ bypass circiut hot. When the water in this circuit starts to cool the boiler will again fire up again thus the boiler never cools during the "timer off" periods.
Any ideas?

PGP, December 2008

HI, i think this sounds similar to a problem we had, we had 2 white boxes in our airing cupboard, sorry cant think of the name at the moment, the PCB had gone on one of them so it was costantly calling for heat, even though it didnt need it and the pipes were very very hot too.

Had a nice engineer look at it and he told us what we needed, and only cost about £25-00 to fix rathe rthan another callout, and he was spot on.

If this is simialr drop me an email Graham@Robertsweb.co.uk and i will try find which part it was we got.

Graham, December 2008