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-   -   I need to add a common wire to a 2 wire furnace (https://www.askmehelpdesk.com/showthread.php?t=807103)

  • Jan 16, 2015, 02:56 PM
    dfbunton
    I need to add a common wire to a 2 wire furnace
    My furnace is wired with a 2 wire thermostat. I need to add/run a common (c) wire to my new wifi thermostat (currently running off batteries).
  • Jan 16, 2015, 04:27 PM
    bitters
    The easy part is finding the common, the hard part is getting a wire to the stat. What is the make and model number on the furnace?
  • Jan 16, 2015, 09:14 PM
    ma0641
    See how many conductors are in the T'stat wire. If only 2, you will need to run a 3. If you are lucky, you may be able to tie the two together and pull back, lots of time the low voltage wires are not nailed onto the studs.
  • Jan 17, 2015, 09:53 AM
    Grady White
    Silly question but why not just run it on batteries. I have 4 thermostats & they all run on batteries which I need to change ever 2-3 years. Nearly all digital thermostats have built in freeze protection which, in case the batteries go dead, will hold the heat at 40-45*.

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