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    4trojan Posts: 1, Reputation: 1
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    Dec 17, 2016, 05:52 PM
    Hello, I have a Goodman furnace model number gmp125-4 rev b.
    How or where can I look for the letter C, I am trying to install a new thermostat and this one requires the wire C as it has no batteries.
    I have look trough the entire board and I found the letters Y,G,W but no C.
    Please help!

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