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thermostat or relay?

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happydave
happydave Member Posts: 79
in THE MAIN WALL
Finished install, multiple zones, Taco zvc control and Sentry valves. Have one zone with t871007k that won't pull in, dip switches are set right, if I jump at wall plate it pulls in, tried four thermostats. Changed wall plate......confused, done this multiple times, same set up in my own home. Feel like Charlie Brown, ugh

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  • Zman
    Zman Member Posts: 7,569
    edited June 2015
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    It sounds like the T-stat is not playing nice with the relay. Which T-stat are you using? Have you tried using different terminals on the ZVC?
    You could also try wiring the t-stat directly to the ZVC in the mechanical room to determine if the wiring is compromised.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • happydave
    happydave Member Posts: 79
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    Non-merc t87, wires good, omhed out, jump ok, going back tomorrow with different thermostat
  • wogpa67
    wogpa67 Member Posts: 238
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    You probably have the old style with ice cube replaceable relays. Not the new made in China Zvc lesser product. That was hard to be nice about toward Taco.
  • happydave
    happydave Member Posts: 79
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    Brandy New Taco relay, all circuits no ice cube relays

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