The central heating has stopped working without warning. The hot water works fine and the modulator light goes out when tap turned off. The pump works as it should after after drawing hot water and the fan is OK. However, the boiler does not ignite for CH. It is as if the timer has timed out, even if the system is on constant. I have replaced the CH thermostat but this made no difference. Any ideas?

Mark, February 2009

new divter fitted

mick, December 2012

heating passing down hotwater drawoff no taps dripping no leaks on system

mick, December 2012

sounds like divertor ,( bit of a swine to change)

steve, February 2009

does boiler fires and goes off after a while and pump continue to run than may be hot tap driping or diverter valve or if neither the pump run nor boiler fires than electricial fault either pcb or other wiring fault not calling for heat than you need expert to find fault.

Mr. K., February 2009

DIVERTER VALVE.

COMBIGUY, February 2009