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can any one help. :cry: the boiler runs ok on c/heating no problem. when i run the hot water tap the boiler switches over runs for one seconed then cuts out with the power light flashing. i have checked both diaphrams and the heat exchanger for sludge all ok pump runs ok as well...

can any one help. :cry: the boiler runs ok on c/heating no problem. when i run the hot water tap the boiler switches over runs for one seconed then cuts out with the power light flashing. i have checked both diaphrams and the heat exchanger for sludge all ok pump runs ok as well. could...