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

    May 2, 2007, 10:40 AM
    Outside A/C compressor comes on when furnace turns on
    I have an older Rheem HVAC system and when in the AC mode, my system works just fine, however when in the Heat mode, the a/c compressor comes on outside when the furnace comes on. I tried replacing the thermostat and the problem persisted.

    I'm not sure when this problem started as we have only been living in the house for a little over a year and we just recently discovered the problem. As a temporary fix, I disconnected the 24v line to the compressor.

    I guess my question is: Do I need to replace the control center in the unit, is this a wiring problem or is something else going on?
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #2

    May 2, 2007, 02:48 PM
    Is it a heat pump? Reversing valve is bad or low voltage to it is not being supplied, maybe thermostat misswired?
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