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help!! i have a ravenheat 820/20t combi boiler, when i turn the hot water tap on the burner fires up as normal and gives hot water as normal, but when i turn the tap off the burner cuts out as normal but 10 seconds or so after the pilot light goes out and the pilot light button pops out then i...

please can someone help!! i have a ravenheat 820/20t combi boiler, when i turn the hot water tap on the burner fires up as normal and gives hot water as normal, but when i turn the tap off the burner cuts out as normal but 10 seconds or so after the pilot light goes out and the pilot light...

HELP!!. My boiler is a ravenheat 820/20t fanned combi, when switching on both the CH and HW after 10 seconds or so the boiler makes like a boiling kettle kind of sound until the system is very hot then it seems to quieten down. If i turn the thermostat on the boiler down it also quietens down...