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Type: Posts; User: jond

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    Thermostat -- What is the "X" wire?

    On my old Rheem thermostat there's 7 wires:
    Green - G
    Red - R
    Blue - B
    Yellow - Y
    Brown - X
    White - w2
    White(looks like its just jumped from e to w2).
  2. I have the same question. Did anyone ever figure...

    I have the same question. Did anyone ever figure it out?
    I have a brown "X" connection on my old system, and it doesn't seem to map to anything on my honeywell unit.

    What would a brown wire going...
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