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    Re: help to wire programmable room thermostat

    The CM67 is battery powered it is only used to switch the boiler, I would be pretty certain that you only connect the red & the yellow.
    Red = Live
    Yellow = Switched live to boiler
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    Re: Newbie Heating Problems - Help!!

    I would be more or less certain that the wiring has been incorrectly connected if this was a replacement valve. If they added a new valve then it could be the plumbing connections.

    I would contact...
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