Hi , what boiler do you have?
Ultracom 38Hxi glowworm
Just downloading the manual , will be a few mins , thanks
Hi , it may be either a fault in the boiler PCB or a fault with an external control. Do you have a room stat? And is it wireless?
Room stat is wired, I think. It's in hall.
Hi , the boiler has a frost stat built in could be faulty but . to confirm if it is an external control at fault , would be able to disconnect the switch livecwire in the boiler wiring centre. Its under the boiler attached by two screws.?
Make sure power to whole heating is off first . it will be number 1 sw/l in the wiring centre