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Thermostat/Taco Zone does not fire off the bioler (gas boiler)

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  • Thermostat/Taco Zone does not fire off the bioler (gas boiler)

    Hello
    Ground floor Theromostat does not fire the boiler. Changed the ZoneHead, did not make a difference. On the Taco Zone head there is 24V to 1 and 3, but does not change to 1 and 2. the Thermostat (mercury based) starts the circulator but not the boiler. 1st Floor Theromostat on another Zone fires off the boiler

    Any insite would help. I figure it could be the relay or the Thermostat? The wire from the thermostat goes to a relay and then to 1 on the Zone Valve,

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