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    doyou4x4's Avatar
    doyou4x4 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jan 4, 2008, 11:58 AM
    Furnace/fan won't turn off
    I have a chronotherm 3 thermostat, Lennox ECB19 12.59 furnace and a Lennox HP19-651-6d heat pump. The heat pump stopped working and then the furnace won't turn off, fan runs on high, I pushed the reset button on the heat pump where the blue wire is attached and now the heat pump work fine. But the furnace still won't stop running I have to turn it off at the braker in the house. I got a new thermostat and that didn't fix the problem. I replaced the three heat relays and I believe to be the blower/fan relay part#90-340 by white-rodgers. And still the fan won't turn off I also removed the green wire at the therm and it won't turn off any help would be apperacated.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 4, 2008, 12:36 PM
    Find and replace the fan relay or timer or sequencer that controls the fan. The fan is being held on by one of these controls
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