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paulwil
have recently encountered a problem with my halstead boiler where the central heating works fine but when running hot water tap/shower boiler fires but stops after a short period of time so giving fluctuating water temp ,upon a plumbers advice i have changed the diverter valve complete but still getting same problem .i have disconnected thermistors and boiler wont ignite at all so figured it was not those but when i have a command for central heating and shut heating output valve and then run hot water problem goes away but obviously no heating so am clutching at straws now can anyone help?