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how can i fix?

when i turn hot water on the boiler is not igniting to heat the water when i turn the heating on the gas ignites any ideas why
jason, October 2008
You should have stated the make and model of boiler before some one can can think............ but it seems a flow switch or hot water sensor.

universal heating ltd, October 2008
if your heating is working fine and you`ve got a combi boiler then its probably either a hot water micro switch or hot water diaphragm.............

kitch, October 2008
since you've provided very few technical details like make and model................some sort of flow switch problem

iain, October 2008