Lennox O23Q5-140 Blower Motor Speed

[molinsky]

I have a Lennox O23Q5-140 Furnace. Last year the control board burned out and was replaced. I think the fan is running at low speed on heat. It should be on high speed. I see three wires - Black Red and White that go to the control board. Black goes to H, Red to A and white to neutral. How do I change the fan speed to high?
Thanks

[molinsky]

Thanks for the reply. I don't see a blue wire. Is it located on the motor side? I only see the red, white and black going to the control board.
I do have a/c so medium high would be fine for heat.

[beenthere]

rickwm228.

This is the Ask Our Pro's forum. In order to post advice here, you must have verified qualifications and have been approved by the AOP Committee.

You can find the rules for posting and qualifications here (http://hvac-talk.com/vbb/showthread.php?t=957002).

[t527ed]

if everything else is stock from Lennox you are running high speed for heat.

won't tell you any more due to rules, if you think its not coming up to speed you should have it checked.

[wahoo]

Call a pro. This is not a DIY site and you could easily burn up this motor. Call the company back and have them check it. Sorry.

[catmanacman]

call the company that replaced the board to come out and check it if less than a yr might be courtesy