Need help. I have just fitted a new Honeywell mid position valve and now I get a loud bang coming from it when hot water or heating comes on. B is going to the hot water tank A to the rads. what can be causing this and can it be fixed
And if you do the above ,now , what's the result ?Unclip the actuator from the valve body ,momentarily turn on the boiler and see if banging is still happening.
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