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Blower motor for electric furnace

It is a intertherm electric furnace from 1989 i put a new blower moter 3 speed it is only ran for one speed at the unit it does not have any kind of board on the corner its old the wires plug in to it and i looked at it is is only running on one speed med low i just wanted to see if i could hook it up to med hi instead because in the summer the central air does not blow hard anough out of the vents in the floor i think when it was built it only had heat and someone hooked up the air but did not change the fan speed for the air thanks

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Yes you can as long as the temperature rise is whithin the proper range in heating on you unit data plate there should be the information the you need to have.

Posted on Mar 21, 2009

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Nordyne furnace FEH017HA-04 the fan runs full force when the ac is on but half speed when the furnace kicks in


That is probably normal if it is electric heat to slow the air over the heating elements. Even some gas units do this. Check to see if the unit blower motor has wires for multiple speeds.

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My intertherm furnace (old model) has recently getting quite loud and clunky during its heating cycles, sound like the blower maybe??


Your blower motor has several speeds to it and by the problem you are having it sounds as though the blower motor may be going out. The motor has a slower speed for the heating cycle and since you have the noise in the heating mode I suggest having the blower motor changed as soon as possible since it could cause other problems in the heating section of the furnace( possibly burning out the high limit switches). Good Luck on your repairs hope this helped

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The furnace send signal to the fan in about 30 seconds, now this fan is set in auto from my termostat, my problem is the fan is starting slowly and some time it don't start, but if I use the option manual...


Depending on the model of the furnace, the blower is either a 2 or 3 speed. When the furnace operates in heating mode with the thermostat in the auto position, the furnace starts the fan when the furnace reaches a specific temperature or after a set time delay, but it operates the fan in low or med low speed on heat mode, when you put the thermostat fan switch in the "ON" position, the furnace operates the fan in "HI" speed, the same speed used for cooling mode. You may have a blower moter that is starting to short. I would recommend having a professional replace the motor before now before it becomes an emergency in the middle of the night during a cold spell.

Oct 10, 2009 | Heating & Cooling

1 Answer

I HAVE AN INTERTHERM FEB-017HAC-04 ELECTRIC FURNACE THAT IS PRODUCING HEAT,BUT THE FAN DOESN'T SEEM TO WANT TO KICK IN. THE BLOWER IS SET TO AUTO.


Probably a time delay relay fan switch not working.
Could be a bad low speed winding in the fan motor.
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You already diagnosed it yourself. The motor may have been the same physical size but it operates at a higher speed and doesn't remove enough heat from the furnace. You need to have the right motor installed period.

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1 Answer

Blower speed


Yes usually the black is high speed, the blue is low and red medium speed. plug the black wire from the fan motor to where the blue wire is, then put the blue where the black wire was

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1 Answer

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you have the motor connected on more than one speed in heat mode. make sure inly one mode is connected

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