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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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Hello, a limit switch will open for the following reasons, dirty plugged filter, blower motor not operating on correct speed or weak, too high gas pressure to burners. If you have a thermometer you can check the temp rise of the furnace by measuring the return air temp and the supply air temp and then the differance between the two numbers will give you your temp rise, compare it to the temp rise that is stated on the furncae data plate. if you are not in the range of what the data plate states then start with the filter and check the blower motor to make sure it is operating correctly.

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1 Answer

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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1 Answer

Blower motor stopped, there is a medium-loud ''electric buzz'' sound every minute or so as if trying to start the blower motor. Could be relay switch. Last week, I extracted the entire motor and fan...


you have a bad "starting capacitor" .. the capacitor is used to get the motor to start in the correct direction .. when its bad the motor doesnt know which way to turn so it just sits there buzzing until it gets hot .. that trips a thermal breaker in the motor and shuts it off ... when it cools it tries again .. dont let it do that for a long time since you could damage the moter eventually ... the starting cap is a round cyclinder probably mounted close to or on the motor (wires come from it to the motor) .. they are not expensive .. you can take the old one with you to a motor parts place so they can match it up with a new one ..

while the motor is buzzing .. if you spin the blower it will start in whatever direction you spin it ... it will run until its shut off but then wont start on its own again ... changing the starting cap will fix that ..

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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.
Set the wall T-stat for ON fan and see if it works.

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1 Answer

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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

Adding a Condensing unit to an Intertherm electric furnace


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

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the blower on my furnace keeps going on and off when i turn the furnace on .ichanged the snapdiscs no change changed thermocoupler and therostat still no change whats my problem

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