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    Neophema's Avatar
    Neophema Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 29, 2010, 07:26 PM
    Phone support had me disconnect "C"
    My White Rodgers 1F95-1271 thermostat screen was blank, and I noticed it came back on when removed, blanked again when installed. Batteries are good.

    Their phone support had me disconnect "C" and reinstall. It works and the tech said not to worry about it.

    What is terminal "C"? Should I have an AC tech take a look?

    Can I use it until the tech arrives?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member
    		  
    #2

    Jun 29, 2010, 07:52 PM
    C = common
    is used so that your tstat draws it main power to work from the transformer in your airhandler, its not necessary but nice that you don`t have to worrie about changing the batteries once a year, use it without the c hooked up, from now on if you like
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #3

    Jun 29, 2010, 09:19 PM

    C may have shorted to another terminal. Without C your batteries won't last as long. C is optional. Another possibility is a bad thermostat.
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