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Thermostat change, now furnace won't work

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lhalstead
lhalstead Member Posts: 2
Hello, We attempted to change the thermostat to a Nest, learned it was not compatible. Put old thermostat back, appears to be working, clicks as if heating, but thermostat will not kick on.

Comments

  • lhalstead
    lhalstead Member Posts: 2
    correction....furnace will not kick on.
  • ethicalpaul
    ethicalpaul Member Posts: 8,870
    How many wires are going into the thermostat? Are you sure they are hooked up the same as before? (taking a before picture is very very helpful but it might be too late)

    NJ Steam Homeowner.
    See my sight glass boiler videos: https://bit.ly/3sZW1el

  • HVACNUT
    HVACNUT Member Posts: 7,470
    This is a hot air furnace, or a water boiler?
    Post pics.

  • pecmsg
    pecmsg Member Posts: 7,088
    Did you disconnect the power at the furnace / boiler?