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namsag hi thanks for that i will check it when i return to the boiler,is it visable from underneath the boiler or do i need to remove the alli cover from the front(switchbox cover)? also by the way it seems to be working fine in hw mode,its just the c h thats giving probs,could well be somthing...

DP hi thanks for reply,yes i am a rgi mate although a fairly new 1,so my experiance is limited,anyway i did isolate the clock/timer but the boiler still fired up,vaillant told me yesterday that if the microswitches are ok then it can only be the board? but this morning they are saying it could...

ok vaillant are saying that the main switchboard has prob packed up,however they say its not conclusive and it could be other things,my concern is that this old couple have thrown £200 at this boiler already and a new board is close on £100 plus fitting and if that does'nt cure it then thats...

help and advice needed please,changed the flow switch assembly(complete)on this boiler yesterday all ok on leaving,however customer rang back today boiler wont switch off even when the clock/programmer is off,went back to it and indeed it would'nt shut down.got the burner to shut off briefly by...

hi, could anyone tell me please what is the largest permitted domestic boiler in terms of kw before it changes to commercial sized boilers? ? thanks.

namsag,thanks for info,i will check if there is a valve and replace,many thanks.

hi-spec thanks for reply,yes it is gravity hw pumped htng.

hi all,advice and help needed please.a few weeks ago i moved a hot water cylinder from the airing cupboard to another cupboard next to the bathroom in total about six feet,i marked all the pipes and reconnected them to the same ones after extending,now my problem is that when i put the...