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worcester 24i rsf combi heating?

hi, when in demand mode my boiler fails to light. fan does not run or pump, but hot water system is fine and working, any ideas?????
dave, September 2010
i would check your external thermostat they always the first to go that cause these faults on boilers

kash, September 2010
link Click here to see other fixes for Worcester Bosch 24i RSF.