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Gas valve not shutting off completely?
Some manufacturers claim this as: Parasitic Gas Valve.
Gas valve continues to pass gas when appliance should be shut down, causing flame to continue.
The boiler thinks the gas valve is shut, but the burner keeps going because their is gas available.
See if you can see if the burner is still alight when you turn the hot water tap off
Some manufacturers claim this as: Parasitic Gas Valve.
Gas valve continues to pass gas when appliance should be shut down, causing flame to continue.
The boiler thinks the gas valve is shut, but the burner keeps going because their is gas available.
See if you can see if the burner is still alight when you turn the hot water tap off