Blower Motor or Controller

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Old 11-01-19, 12:55 PM
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Blower Motor or Controller

I have a Consolidated Industries Model HDA100HN5R AC/Furnace. My problem is with the blower motor. I don't use the AC function, just the furnace.
When I started the system this season, the blower motor worked normally. The second cycle the motor ran at half speed. The next few cycles the motor continued to run a half speed. Now the motor won't run at all.
I'm not sure if the problem is with the motor or the controller. I would appreciate any thoughts on how to determine where the problem lies.
Thanks.
 
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Old 11-01-19, 02:23 PM
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Welcome to the forums.

Sorry.... I can find any unit by that model number.
See if you can find a wiring diagram on the wiring access cover. We'll probably need to see that.

You're going to need a meter to check for supply voltage to the motor. That will determine if it's a board problem or a motor problem.
 
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Old 11-01-19, 04:05 PM
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Blower Motor or Controller

Here is the wiring diagram.
 
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Old 11-01-19, 04:08 PM
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Once I got the cover off, I did notice that the Diagnostic Light was flashing 4 times. I'm assuming there is no circulation airflow.
 
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Old 11-02-19, 01:47 PM
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Hi, do you have a multi meter? Locate the Speed select relay, trace the wiring back from the motor, with one lead of the meter to ground and the furnace calling for heat place the other lead of the meter to each of the terminals on the relay and determine which one has 120 volts, it should be either Red or Blue.

Geo
 
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Old 11-07-19, 08:20 PM
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Thanks for the reply. I did check the blue lead and it fluctuated between 118.5 and 119.1 volts. When I was checking and the fan received power, it hummed and didn't start turning until I gave it a "nudge". Then it started to run at the correct speed, with no noise or other issues. Could it be the capacitor?
 
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Old 11-07-19, 08:50 PM
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Since you've measured the proper voltage...... the board is ok.
Yes.... it could be a capacitor or worn out bearings.
 
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Old 11-07-19, 11:37 PM
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Blower Motor or Controller

Attachment 110790Thank you, Pjmax. I'm going to start with the less expensive option and change the capacitor first.
As my luck would have it, the uf and model numbers are illegible on the capacitor that I removed, see photo. It looks like it could be 10uf. I've read that the wrong uf number can mess up my motor.
 
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Old 11-08-19, 05:39 AM
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Hi, looks like 10 UF, is there anything on the motor nameplate as to Cap size?
Geo
 
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Old 11-08-19, 04:43 PM
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Geochurchi, there was a plate on the motor. As my luck would have it, it was under the strap holding the motor. I was able to move the strap enough to see that it was 10uF. One quick to Grainger and $5.96 later, I now have a working heater again. Especially since the weatherman is saying we might be breaking record lows here in Birmingham Alabama.
Many thanks to you and Pjmax for your help.
 
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Old 11-08-19, 10:11 PM
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Good job. Name:  thumb.jpg
Views: 8
Size:  1.6 KB Thanks for letting us know how you made out.
 
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