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The fan in the airhandler wont shut off.

I have a rheem heat pump system. The problem is the fan in the air handler never shuts off. Even if the thermostat is in the off position. The only way to turn it off is to take the thermostat of the wall(and it runs for about 30 to 60 seconds) or flip the brakers on the unit. Why wont the fan shut off?

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  • baldauf7 May 15, 2009

    Both, I have a honeywell thermostat also. this is a new unit! Could there be something wrong with the wiring?

  • baldauf7 May 15, 2009

    And the fan switch is on auto!

  • baldauf7 May 15, 2009

    It does it on both cool and hot settings!

  • baldauf7 May 18, 2009

    No the fan still hasnt shut of unless you take the thermostat off the wall! Could it be the thermostat?

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The fan is controlled by a blower timer board located inside the air handler, or on older units it has a relay called (of all things) a blower relay. If these items were at fault I doubt removing the thermostat would cause the blower to go off. if bad causing this problem the blower would continue to run even with thermostat removed.

But it is also controlled by the thermostat.

You mentioned that if you remove the thermostat it cuts off. There are 2 switches on most thermostats.
1 has Cool, Off, Heat, and Emergency Heat (on a heat pump stat)
2 The other switch has On and auto (it is for the fan motor only)

I believe because it stops when you remove the thermostat that the switch on the fan is set to on possibly. It should be on auto-matic. This way the fan motor only come on with cooling or heating. If in the on it stays on all the time. If this is the case just switch to AUTO.

Or the thermostat may be wired wrong. The G terminal is where the fan motor gets instructions from the thermostat. Make sure its on G at the stat and the correct wire at the blower coil is being used for the corresponding wire going from the stat to the blower for G. Don't confues G for green it could be any color. The terminals are not for color but it makes more sence to make them color - letter identified. On the other end soemtimes the wires are not colored the same so look carefully.

Also a whisker of a thermostat wire could be touching inside the thermostat and causeing the motor to run 100%. Look carefully at this and see if it has too long of thermostat wires stickinhg on out under the screws to where they may tough other things.

If neither things stop or show the problem and it deffinately stops when thermostat is removed the thermostat is most likely bad.

If this helps you 1 way to make the repairs your\self or helps you realize you need a technician please rate mne as high as you can.

Posted on May 14, 2009

  • Farley Redfield
    Farley Redfield May 16, 2009

    DID you get the fan to go off?

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Is this on heat or cool

Posted on May 14, 2009

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