I have a Ferroli Sigma boiler and a British Gas programmer for the heating and the water. Everything works fine but occasionally when everything is in the off position the boiler fires up. This does not start the heating and does not appear to heat the water. It does not do it all the time but its disconcerting when it suddenly kicks in in the middle of the night. The only way to get it off is to turn the knob on the boiler to the "off" position.
Any help would be appreciated (not too technical please)
Cheers
Any help would be appreciated (not too technical please)
Cheers