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  1. #14
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    Does the heatpump cut out completly when the furnace comes on? It is definetly not recommended to run furnace and heatpump at the same time. That is the purpose of a fossil fuel kit or outdoor temp stat on Vision Pro tstat. The Hpump MUST be turned off before the furnace comes on. You can set any differential you want but I would turn the gas off to the furnace until this situation is rectified. Other wise you may find yourself shopping for a new heat pump.
    "Go big or Go Home"

  2. #15
    Join Date
    Jun 2005
    Posts
    44
    Yes--thermostat is set for add-on heat, locks out compressor when calling for aux heat/second stage.

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