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-   -   How do I replace a 3-wire thermostat with a 4-wire thermostat? (https://www.askmehelpdesk.com/showthread.php?t=426487)

  • Dec 19, 2009, 02:23 PM
    sammi1294
    How do I replace a 3-wire thermostat with a 4-wire thermostat?
    We bought a Honeywell thermostat with four wires and our current Mears model has 3 wires colored black, red, and white. The wires on the Honeywell model are 2 red and 2 black. How, if possible, can we use this thermostat with the current wiring?
  • Dec 19, 2009, 02:39 PM
    ballengerb1

    Do you have AC? Its common to jumper the two reds together. This may help Thermostat wiring colors and furnace terminal designations repair.

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