Lennox ML180UH not blowing hot air

Reply

  #1  
Old 10-25-17, 04:33 AM
Member
Thread Starter
Join Date: Oct 2009
Location: Woodstock
Posts: 122
Received 0 Votes on 0 Posts
Lennox ML180UH not blowing hot air

Flipped to heat this morning. First time this year so was waiting for that lovely here's the gas smell. Didn't happen. Checked vents and no air flow. Turned off at thermostat and waited 5 minutes. Nothing. Turned off power at furnace and waited 5 minutes. Nothing. Opened panel and flipped gas to off, waited 5 minutes. Still nothing. Looked through the little window at the bottom and there's a blinking red light. Blinks 3 times, pauses, blinks three times. Checked the manual and, as far as I can tell from the table of blink codes, the red in fast flash without a corresponding green doesn't really mean anything unless there's also a green light (page 7 of this manual. I may be reading that wrong.

Furnace has been fine for 3 years and blows cold air no problem, so I don't think it's the dirty filter. Any thoughts?

Edit: I took the bottom panel off and there's only 1 LED. So now I really have no idea about the blink codes from the manual...

I also made sure all the connections on the circuit boards were secure.

I've got HVAC guy coming out this afternoon, but if it's something easy that I can fix before that, I'd rather save the money.
 

Last edited by hmhill17; 10-25-17 at 06:57 AM. Reason: Additional information.
Sponsored Links
  #2  
Old 10-25-17, 06:35 AM
Member
Join Date: Feb 2014
Location: USA
Posts: 2,104
Received 0 Votes on 0 Posts
The way I read it you have a problem with the flame sensor. Try cleaning it and make sure the wire is tightly connected.
 
  #3  
Old 10-25-17, 09:05 AM
Member
Thread Starter
Join Date: Oct 2009
Location: Woodstock
Posts: 122
Received 0 Votes on 0 Posts
Thumbs up

Originally Posted by skaggsje View Post
The way I read it you have a problem with the flame sensor. Try cleaning it and make sure the wire is tightly connected.
That seems to have been the problem. I Googled flame sensor, found a video on how to remove it, cleaned it wish a rough dish sponge, put it back and I have heat. Just saved me a $100+ visit from the HVAC guy.
 
Reply

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


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: