Blower Motor or Controller
#1
11-01-19, 11:55 AM
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.
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.
#2
11-01-19, 01:23 PM
Group Moderator
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.
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.
#5
11-02-19, 12:47 PM
Member
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
Geo
#6
11-07-19, 07:20 PM
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?
#7
11-07-19, 07:50 PM
Group Moderator
Since you've measured the proper voltage...... the board is ok.
Yes.... it could be a capacitor or worn out bearings.
Yes.... it could be a capacitor or worn out bearings.
#8
11-07-19, 10:37 PM
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.
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.
#10
11-08-19, 03:43 PM
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.
Many thanks to you and Pjmax for your help.
#11
11-08-19, 09:11 PM
Group Moderator
Thanks for letting us know how you made out.
