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my boiler is heating the radiators but not water?

my boiler is heating the radiators but wen the hot water taps are turned on the boiler ignition goes on and off so the temp of the water goes hot and cold constantly, no long run of hot water.
helen lishman, January 2009
depends which nodel of boiler but it could be a diaphrage or a thermistor

www.gascentalheatinguk.info, January 2009