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I have a main medway boiler?

when I turn on hot water tap the boiler makes a loud bang and the pilot light goes out.
alan mills, August 2009
You don't want to mess with this yourself as it sounds like a stuck gas valve, which means the gas is remaining on after the water differential valve shuts off. This will activate the overheat and shut down the pilot via the thermo-electric valve. My best advise would to turn it off, don't use it and contact a Gas Safe Registered engineer.

Sean, August 2009
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