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Old 08-23-2012, 11:50 AM   #1
Join Date: Aug 2012
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Furnace Motor Runs Slow

I have a 5 year old Armstrong Hiboy direct drive oil furnace that also provides A/C from an outdoor Trane unit. A few nights ago with the A/C on, there was barely any air coming from the registers. Opening the furnace access panel, the blower was running but very slow. I shut the unit off and then turned it back on and the blower did not turn but made a humming sound. I turned off the unit again, gave the blower a spin, turned it on and it was now running at a normal high speed. After running about an hour, I cycled the power again and the blower was back to running slow.
I havenít pulled out a meter yet to test, but reviewing the wiring (black, blue and white to the motor) and schematic, there is a relay switch (with low voltage violet wires) and a fan limit switch. Just wondering if these components could be the issue or if itís the motor itself? Bad starter cap or winding?
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Old 08-23-2012, 12:42 PM   #2
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Location: Nebraska
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Furnace Motor Runs Slow

Probably a capacitor for now. Keep runnig it like that and you'll need a motor too.
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Old 08-27-2012, 12:04 PM   #3
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Furnace Motor Runs Slow

Bingo! Replaced the 7.5 mfd 370v cap on the blower motor and all good! $6 at Graingers.
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