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Worcester bosch highflow 400 - the green demand light never works when i select it, there's no hot water or heating. The green demand light does not comes on but there is noise from the boiler . .

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Sounds like a control panel.Detatch the block connector that serves the gas valve,see if you have power on the bare pins.both left and right pins should measure mains voltage.If you have no power at the pins its the pcb control board.Replace the board.

Posted on Nov 24, 2008

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