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Old 11-12-2011, 05:30 PM   #1
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2 speed motor continues to run on slow speed


Hi,
I am new to this forum. I was hoping you folks might be able to help me with an electrical problem Im having with my Intertherm electric furnace that has a 2 speed motor. One day I noticed that the furnace was running on a slow speed and wasnt heating. The thermostat wasn't calling for heat. After a lot of fussing around and doing internet searches for answers I thought I had the answer. I thought it was the sequencer so I oredered a new sequencer and received and installed it today. The furnace still does the same thing. I started looking closer and I find that the wire to the motor for the low speed isnt even hooked up. If I am reading things right the Black wire powers the high speed and the Red wire powers the low speed, and the red wire isnt hooked up and never was. But somehow the motor continues to run at slow speed after the furnace shuts down. It runs on high speed and heats just fine when the thermostat is calling for heat. It seems to me it must be a problem in the motor itself. Has anyone out there ever seen this before? Thanks for any help you can give. Rob

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Old 11-12-2011, 09:03 PM   #2
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2 speed motor continues to run on slow speed


Seems to me as if there is a ground fault in the motor, one cause is the enamel insulation on coil wiring somehow deteriorated and the wire coming into contact with grounded metal parts.

Is the motor 120 volts or 240 volts? A 240 volt motor with a ground fault could well be energized all of the time, including when it should be "switched off" and the switch controls just one of the two power leads.

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Last edited by AllanJ; 11-12-2011 at 09:05 PM.
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Old 11-13-2011, 06:34 PM   #3
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2 speed motor continues to run on slow speed


Hi again,
I found out what was happening to cause the blower motor to run at slow speed. I found that one of the heating coils what shorting out to the frame that it is mounted on. This was causing this coil to stay partially heated up and also it was allowing a partial voltage to be applied to the high speed feed to the motor. Part of the heating coil that shorted had become distorted enough to touch the frame its mounted on. All I did was bend the coil a little where it was distorted. I could feel it stick a little to the frame when I bent it like it was welded there a little. I put it all back together and now the furnace works fine.
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