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The Motor THAT is located at the bottom of the exaust pipe continues to run when the furnace finishes to blow hot air . What is the cause? Thank-you Kirk

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  • kaadahewlett Dec 30, 2008

    INTERTHERM Gas Furnace Model # MGHB090AAPQ-1. The furnace has been working fine until recently. When the fan finishes blowing the hot air, the motor at the bottom of the exaust chimney stays running.

  • kaadahewlett Dec 30, 2008

    Thank-You. How do I go about replacing the thermal sensor switch.

  • kaadahewlett Dec 30, 2008

    Thank-you. It seems like my air filter may have been overdue to be replaced. This may have been causing wrong signals to go to the Thermal Sensor.
    Your solution was very helpful.
    Thank-You and a Happy New Year.

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Hello and welcome to FixYa!,

This problem is caused by a defective Heating Coil or ThermoStat Sensor, these may need to be replaced as they might have become defective or broken.

This might be the solution you are looking for - hope it is your FixYa!

--P3NGYJ03

Posted on Dec 30, 2008

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There should be a small thermal switch (heat sensing component) near the heating coil. If this switch is defective, the fan will stay running since it still "thinks" the coils are hot. Replace the thermal sensor, and it should be fine.

Posted on Dec 30, 2008

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Some connections are crossed up still supplying a small amount of power to the motor.

Posted on Dec 30, 2008

  • technodeal Dec 30, 2008

    check the internal connections and u can repair the faulty connections

  • technodeal Dec 30, 2008

    also check thermal sensor and if its faulty replace it

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