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

    Dec 11, 2009, 02:35 PM
    Blower Fan on Carrier Heating/AC Unit will not shutoff
    I have a Carrier Heating/AC Unit that the blower fan will not shutoff. The unit was running, then the heat turned off but the blower fan did not. Now the blower fan is on all the time and the heat or A/C will not come on. In order to get the blower fan off I have to cut the power to the unit at the main house breaker. This unit is the type that mounts on the roof. I have replaced the thermostat and this changed nothing.
    The model number is: 48NMT036---301BE

    Here is a link to the circuit board diagram:
    http://www.xpedio.carrier.com/idc/gr...d584a.18.1.pdf

    The Circuit board number is: 316457-401
    laynerd's Avatar
    laynerd Posts: 22, Reputation: 1
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    #2

    Dec 12, 2009, 08:19 AM
    Quote Originally Posted by Forestry View Post
    I have a Carrier Heating/AC Unit that the blower fan will not shutoff. The unit was running, then the heat turned off but the blower fan did not. Now the blower fan is on all the time and the heat or A/C will not come on. In order to get the blower fan off I have to cut the power to the unit at the main house breaker. This unit is the type that mounts on the roof. I have replaced the thermostat and this changed nothing.
    The model number is: 48NMT036---301BE

    Here is a link to the circuit board diagram:
    http://www.xpedio.carrier.com/idc/gr...d584a.18.1.pdf

    The Circuit board number is: 316457-401
    If you have replaced the thermostat, the only thing remaining is the air handler/inside unit fan timer circuit board. It will usually cost about $50. I recently had the same problem with a carrier Heat Pump/Air Handler. Mine would not cut on. Replacement of it solved the problem. Good luck!
    laynerd's Avatar
    laynerd Posts: 22, Reputation: 1
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    #3

    Dec 12, 2009, 08:20 AM

    If you have replaced the thermostat, the only thing remaining is the air handler/inside unit fan timer circuit board. It will usually cost about $50. I recently had the same problem with a carrier Heat Pump/Air Handler. Mine would not cut on. Replacement of it solved the problem. Good luck!
    Forestry's Avatar
    Forestry Posts: 2, Reputation: 1
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    #4

    Dec 13, 2009, 09:10 PM

    Thanks for the reply. I called a local place about the circuit board and was quoted $180 for the circuit board and another $100 for the piggy back board. Is there more than one circuit board? The only one that I have seen is the one that the thermostat wires go to.
    peakslayer's Avatar
    peakslayer Posts: 1, Reputation: 1
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    #5

    Jan 11, 2011, 08:42 AM
    Hi

    I had the same problem and haven't been able to solve mine either. What did you do to solve this problem?
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