Could sks please advise me on the following:-
The above boiler will not provide constant C.H. It's fine on the H.W. side but on the C.H. side it will ignite and stay alight for about 25 secs then it turns off for some 30 secs and re-ignites for 25 secs again in a continuing cycle. would it be a themostat ? The pump and extractor fan seem to be performing ok and the pressure is alright. Any suggestions would be very welcome
Thanks
Bill