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Mend Heating Pressure Blockage

No hot water, heating ok?

boiler does not fire up when tap turned on and water flows. Fitted new pressure manifold but cannot get the diaphram plunger to move and operate the flow switch. All small bore pressure pipes clear and water flowing to manifold at mains pressure, suspect a blockage in the Non return valve, is this a possible fault?

Den
August 2011
Heating, Home Heating SystemsHeating Pressure Blockage

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Boiler No Hot Water - Flow Switch Issue