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    Fairly sure my Drayton ZA5 is duff, does this sound right?

    Hi Guys, Got a problem with my heating at the moment in that the boiler is not switching off when the thermostat clicks off. I think I've pinned it down to the motorised valve, which is a Drayton two-port with a ZA5 actuator. If I move the manual lever then release it the burner clicks...
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