Luxaire Furnace Inducer Fan Will Not Start. - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 12-24-2015, 04:58 PM   #1
Join Date: Dec 2015
Posts: 3
Rewards Points: 6

Luxaire Furnace Inducer fan will not start.

This summer I had flooding in my basement. The furnace was damaged. The inducer fan and control board were replaced. It worked fine for several months.

It recently stopped working again. The error code is 3 flashing lights indicating pressure switch stuck open. When disconnecting the pressure switch hoses, water drained out. I removed the pressure switch and drained it. I also removed the inducer fan to check for problems.

While the pressure switch and inducer were removed, I took them to my father's house where he has better electrical tools. We were able to start and run the inducer by powering it directly. The pressure switch appears to be working properly.

I reassembled the parts, and no luck. I can get the error message to change from stuck open to stuck closed by applying suction. The inducer will still not start. I am unable to check if power is being sent to the inducer, but since I know the fan works, I am assuming it is not.

I've decided it must be the relay in the control board, but the entire board was recently replaced. I suppose it is still possible. I keep wanting to return to the pressure switch, since I know it had water in it... but I am told that the inducer should still fire first.

Can a bad pressure switch prevent the inducer from firing, or am I just getting that code because the inducer won't start?

I am new to the forum. Any advice would be appreciated. Thank you in advance.


briarrantilla is offline   Reply With Quote
Old 01-06-2016, 05:32 PM   #2
Join Date: Jan 2016
Posts: 2

If installed correctly pressure switch should be in relay with the fan, so replacing that may be the answer


Bobplumb is offline   Reply With Quote
Old 01-06-2016, 06:23 PM   #3
An old Tradesmen
Join Date: Oct 2008
Location: Somewhere
Posts: 34,402
Rewards Points: 7,794

Thr inducer must run in order for the pressure switch to close. So the pressure switch has nothing to do with the inducer not running.
When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
beenthere is offline   Reply With Quote
The Following User Says Thank You to beenthere For This Useful Post:
ben's plumbing (01-06-2016)
Old 01-06-2016, 06:27 PM   #4
Join Date: Mar 2014
Posts: 259
Rewards Points: 469

Post picture of wiring diagram
Jnaas2 is offline   Reply With Quote
Old 01-06-2016, 09:11 PM   #5
Join Date: Oct 2015
Posts: 138
Rewards Points: 276

Our Lennox furnace has safety switches wired in series. All have to make contact for the thing to run. If you saw water damage, I suspect your safety switches are slowly giving up the ghost. I suggest you look at all before digging at a new control board that in my experience is often the last to fail. The safety that went on mine is on the back side of the blower and was a bugger to get at. I replaced all in that series for another twenty bucks just to take them out of the equation.
throrope is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Brand New Concord Furnace Doesn't Work In Cold Weather LeighC HVAC 21 01-07-2013 08:48 PM
Payne 90 plus furnace no start montoyaclan HVAC 5 12-20-2012 05:15 PM
Comfort maker furnace won't start inducer motor. Jperez5 HVAC 6 10-28-2012 10:05 PM
Furnace blower forgets to start when temp drops. stanulet HVAC 3 03-06-2012 03:09 PM
payne furnace inducer motor minime_moomey HVAC 13 02-20-2010 12:52 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1