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    abo321's Avatar
    abo321 Posts: 2, Reputation: 1
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    #1

    Nov 22, 2010, 04:40 PM
    Air Conditioner Fan runs when Heater is On
    Hello All
    I have two separate air conditioning units and two thermostats for 2 zones. The Air conditioner is from Trane and about 10yrs old. I have a problem on one of the units/zone.

    When the thermostat is set to heat mode - and the heater turns on - The outside air conditioner unit fan also turns ON. Don't notice any issues inside. Hot air is blowing from the vents just fine. I don't experience this with the other zone and air conditioner unit. I also replaced the thermostat unit inside the house. The wiring to the thermostat is Red, Yellow, White, Green Wires.

    No issues in summer - both air conditioners work just fine...

    Any experts may know what the cause may be?

    Thanks for all your help
    abo321's Avatar
    abo321 Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Nov 30, 2010, 10:34 AM
    Update - Had a Heater Annual service completed and the technician identified that the Yellow and White wire had a short somewhere that was causing the A/C compressor to switch on when the Heater is switched on too. Used some other wire and issue got fixed.
    hvac1960's Avatar
    hvac1960 Posts: 5, Reputation: 1
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    #3

    Dec 16, 2010, 06:51 PM
    Check zone control operating only one room while in heat mode.
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