worcester combi. HW ok. CH clicks but no fire? Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[wrightyboy]

worcester 240 combi approx 10yrs old. hot water fine but ch clicks but does not fire up all the time. 1 day in 7 works. had eng round said could be pcb or gas valve or something, cant remember. said no garantee pcb will fix problem. cant afford new boiler pls help!