I’m having issues with a blower motor at my own house. I noticed a slight burning smell almost like a curling iron that has been left on if anyone is familiar with that smell. So I popped open the Air Handler access panel and noticed the motor seemed to be running slower than usual. I went ahead and replaced the run capacitor, however, that didn’t help even though the other one was slightly under tolerance.

So I pulled the 1/6 HP blower motor out. It is a 3 spd single phase, 1060 RPM, 230V. There was one red wire coming to the B terminal on the motor, which I have to believe is the power source. The motor was rated at 1.15 AMPS and when I put a clampon meter across the line I was getting that. It is 14 years old. It only has 1 yellow wire coming from it and 1 black wire. Then there is the ground that was screwed to one of the mounting bolts. I checked the resistance across all the terminals and this is what I found:

Yel to Blk = 88.3 ohms

Blk to Term A = 52.5 ohms

Blk to Term B = 37.9 ohms

Blk to Term C = 33.0 ohms

Yel to Term A = 74.7 ohms

Yel to Term B = 60.1 ohms

Yel to Term C = 55.2 ohms

A to B = 14.6

B to C = 4.9

C to A = 19.4

Problem is I’m not totally certain on what these measurements mean, other than the sum of the terminals A to B and B to C equal the measurment between the terminals C to A.

I just need to know if this is a bad motor because of the smell that we were smelling from the vents directly below where the Air Handler sits in the attic. Can someone please explain how much of this is relevant and what it should or should not read. The only examples I could find on line had a lot more wires coming from the motor, whereas mine only had the Yellow and Black. Any assistance would be greatly appreciated.

Regards,

Steve