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    Viessmann 100 UTA Room Thermostat and boiler not synced

    My Viessmann 100 UTA Room Thermostat ran out of battery recently and began flashing red. I change the battery after noticing the heating was on constantly. After switching on and off the boiler (30 kw combi boiler) in attempt to reset the sync the timer does not appear to be communicating...
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