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    walter57's Avatar
    walter57 Posts: 1, Reputation: 1
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    #1

    Mar 11, 2013, 03:15 PM
    York electric furnace
    My furnace will not shut off by the thermostat.I installed a new thermostat and still will not shut off or change from emergence heat to heat pump.is there a relay switch at the furnace I can replace.
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
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    #2

    Mar 15, 2013, 06:36 AM
    Yes, there is a fan switch attached to the plenum that needs to be replaced or adjusted. Some units have a small "button" type and others have the type that is adjustable. Look here: How to Adjust and Test Your Furnace Fan Limit Switch
    Alternatively, it could be that you have a stuck fan relay. If it's running on high speed it could be the fan relay. You will have to use an ohm meter to know, but a quick adjustment of the fan/limit switch on plenum will rule that out. I have seen wires melted together in t-stat wires, too, but it's rare.
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