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  • This seems to be a three way valve. The box itself is moving an making knocking sound. The heating is on but the radiators are cool.

    I've moved the switch underneath a bit and it seems to have stopped moving.

    What is this mysteriousness?


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  • Do you have a hot water tank? If so it’s probably the valve that decides if hot water goes to central heating or to water. Believe they can be set manually using the lever.

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