when i switch boiler on, central heating works fine, but as soon as i use hot water from tap, central heating light goes off and powers down completely. Rads go cold and central heating will not fire up at all. if i switch boiler off completely, leave for a period of time, it resets and back to square one. So it only lets me use one or the other basically. Any ideas? Please help!!??

Terry, March 2009

replace the pcb. i have have a few of them do that.

boiler bill, March 2009