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bosch worsester 230 no fire up?

boiler will not fire up unless you turn the hot water on, then it fires up but no central heating. can anybody help, thanks.
lawrence from wigan., September 2010
check the thermostats or timers as if they have not been used they stick may need changing its the most common problem with this fault

kash, September 2010
link Click here to see other fixes for Bosch.