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

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 12-13-2010, 09:01 PM   #1
Newbie
 
Join Date: Dec 2010
Posts: 2
Rewards Points: 10
Default

Lennox G43UF Burners Failed to Ignite


I have a furnace that periodically slow-alternating flashes "Watchguard - Burners Failed to Ignite". It attempts to ignite four times then goes back to the watchguard. The burners glow orange and I hear a "click", but it does not light.

It did this about a half dozen times last year and I finally paid a guy $150 to look at it, and he said he didn't think it would be covered under warranty because he couldn't figure out what the problem was. (Thanks!) He recommended I just keep turning it on and off.

It happened on Nov 21 and I cycled through it about 11 times before it fired back on and ran fine for almost a month. It did it again tonight and I've been turning it on and off for an hour now. What the heck is wrong with this thing?

joshmaurer is offline   Reply With Quote
Old 12-13-2010, 09:06 PM   #2
Newbie
 
Join Date: Dec 2010
Posts: 2
Rewards Points: 10
Default

Lennox G43UF Burners Failed to Ignite


It's probably the ignitor that glows orange; the burners never light ( no blue flame or anything)

I'd like to try and clean the flame sensor and ignitor, but the thing is too tight to get my hands in there. Any suggestions?

joshmaurer is offline   Reply With Quote
Old 12-13-2010, 09:21 PM   #3
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 1,000
Default

Lennox G43UF Burners Failed to Ignite


Put a meter on the two wires going to the gas valve and see if there's 24 volts. Ignitor glows and the gas valve doesn't get 24 volts then you're looking at a new circuit board. If the gas valve gets 24 volts check if there's gas going to the valve and going out of the valve.

Ignitor should be around 55 ohms.

Last edited by Marty S.; 12-13-2010 at 10:22 PM. Reason: added info
Marty S. is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Lennox Furnace 80UHG3 Won't Ignite KeithGP HVAC 8 03-22-2014 12:22 PM
Trane XE80 Burners Won't Ignite BFR HVAC 11 12-12-2010 07:33 PM
Lennox 80MGF3-75A-3 Won't ignite SAMUEL58 HVAC 7 12-10-2010 10:58 PM
Our Lennox G24M4/5X fails to ignite Ucla61 HVAC 1 11-29-2010 11:21 PM
Furnance won't work...question about Lennox G43UF mandirenee HVAC 4 10-09-2009 09:21 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.