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I need to see how to wire it from thermostat to blower motor.

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  • gussie doucet Oct 08, 2009

    Thanks, the system is at my fishing camp and is 112 miles away so I can only tell you what inforation that I have here. Its An Intertherm electric air and heat. On the blower it has mocel number 901282 Intertherm-multispeed `air circulator. Central electric furnace model no. FEH-015HA. The unit was working fine when we turned it off. With back 2 monts later and it would not come on automatically thru the thermostat. If I pushed the switch at the unit it worked, but didn't come on or off on its on. Called a service person and he broke it completely. Touched some wires together at the thermostat, they sparked and that was the end of it working. Had another person come out and he got it to running but not automatically. I am in the same place that I started. What I need to know is the wiring diagram to the blower. There is a blue wire not connected. I have purchased a new thermostat and Sat I will try to connect it. Thanks again



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First we need to know what type of system you have. Gas furnace, heat pump, etc. Then we need to know what color wires you have, then exactly what terminals you have on the back of the thermostat, and if it is battery operated.

Please understand this is obviously not your solution, but a request for more information so I can provide your solution. So if you could refrain from rating until we have answered your question it would be appreciated.

Posted on Oct 08, 2009

  • Danny Clark
    Danny Clark Oct 08, 2009

    OK With an electric furnace you probably have the following wires.






    The following color codes are industry typical but the rare unit can be wired differntly in the field.

    Yellow = AC condensor

    Blue = common

    Green = blower fan

    red = hot24V

    white = furnace

    The thermostat should have terminals similar to the following, but please nmot certain brands/models may vary.






    You would wire the thermostat like this

    R = red wire (24V)

    W1 = white wire (furnace)

    G = green wire (blower motor)

    Y = Yellow wire (AC condensor)

    C = Blue wire (common)

    From what you stated above it sounds like the transformer was blown when the "sparks flew".

    The system will have to have 24V coming out of that transformer to work.

    If any of your situation is different or you require further assistance please let me know. Thank you for choosing FIXYA!



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You mentioned that if you remove the thermostat it cuts off. There are 2 switches on most thermostats.
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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.

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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.

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