anybody? just descaled my heat exchanger on worcester24i rsf combi boiler flow rate now is 8 ltrs /min but when hot tap is turn on after 10secs it shuts down then tries firing up which it does then again shuts gas off ,thought flow switch changed that still same problem can any solve this mystery

keith, January 2010

central heating works fine, fan ok .no loose wire or c.h wouldnt work ? dhw over rides the ch until the taps turn off

keith, January 2010

may be blocked fan venturi

Ian, January 2010

is there a wire at the back of the burner going to a probe
that may have come off

b, January 2010