Lennox Elite Series Furnace Problem - HVAC - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 01-24-2010, 03:26 PM   #1
Newbie
 
Join Date: Jan 2010
Location: Kansas
Posts: 2
Rewards Points: 10
Question

Lennox Elite Series Furnace Problem


I have a Lennox Elite Series furnace that is giving me an error code according to the diagram on the front. The left green light is slow flashing and the right green light is solid which according to the diagram means the primary/seconday limit switch is open. The furnace will run for a while after I turn the power to the furnace off and back on but then when the thermostat calls for the heat to kick on a second time the furnace will not ignite again withouy cycling the power once again.

I was having this same problem a few weeks ago and went to a much cheaper grade filter and the problem went away. I also cleaned the sensor in front of the flame with some light grit sand paper but the problem is now back.

Does anyone have any suggestions?

Thanks

Advertisement

steges is offline   Reply With Quote
Old 01-24-2010, 03:31 PM   #2
Member
 
Join Date: Dec 2008
Location: West Michigan
Posts: 440
Rewards Points: 250
Default

Lennox Elite Series Furnace Problem


If you have an a/c evaporator you will want to check both sides to make sure it is not plugged with dust and debris. Also make sure all registers and grills are unobstructed and open.

Advertisement

SKIP4661 is offline   Reply With Quote
Old 01-24-2010, 06:46 PM   #3
HVAC Tech/ Browns Fan
 
Join Date: Dec 2009
Location: Dayton, ohio
Posts: 541
Rewards Points: 500
Default

Lennox Elite Series Furnace Problem


You need to check Fan limit switch. It maybe bad I had replace some on that unit.
Tator1076 is offline   Reply With Quote
Old 01-24-2010, 08:36 PM   #4
Member
 
Join Date: Dec 2009
Posts: 636
Rewards Points: 500
Default

Lennox Elite Series Furnace Problem


When you cleaned the flame sensor a few weeks ago you probably put small grooves in it that will trap the dirt and not be able to be cleaned out. Never use sand paper, use fine steel wool or even a dollar bill.
hvac benny is offline   Reply With Quote
Old 01-25-2010, 11:29 AM   #5
Newbie
 
Join Date: Jan 2010
Location: Kansas
Posts: 2
Rewards Points: 10
Default

Lennox Elite Series Furnace Problem


Thanks for all of the feed back. The one thing I did do to just test was to pull the furnace filter out and the furnace ran all day and night without a problem. I have used the same furnace filter for 9 years now until I just changed to a cheaper less dense filter when I first started having this problem. As stated earlier once I changed to the cheaper filter the problem went away for a few weeks and then came back again yesterday and is now gone when I pulled the furnace filter out.

Could the flame sensor be going bad? The whole reason I changed filters was b/c we had a cold snap and the furnace was running more than normal and I was told that with a dense filter it is not allowing the heat exchanger(I believe that is what I was told) to cool down properly.

Does this make sense? Am I on the right track or was I given miss information?

Last edited by steges; 01-25-2010 at 11:30 AM. Reason: spelling
steges is offline   Reply With Quote
Old 01-25-2010, 06:55 PM   #6
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 1,000
Default

Lennox Elite Series Furnace Problem


Check the blower motor capacitor. They get weak over time and need to be replaced. Most new ones have a rating +/- 6% so it doesn't take much loss to have a low mfd capacitor out of specs.
Too restrictive of a filter is hard on motors and heat exchangers.
Marty S. is offline   Reply With Quote
Old 11-06-2010, 02:54 PM   #7
Newbie
 
Join Date: Nov 2010
Posts: 1
Rewards Points: 10
Default

Lennox Elite Series Furnace Problem


lennox furnace g26 flame will not lite
pruibb is offline   Reply With Quote
Old 11-06-2010, 03:49 PM   #8
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,041
Rewards Points: 720
Default

Lennox Elite Series Furnace Problem


Any error codes from the flashing led lights in the viewing window on the lower door? Does the exhaust ventor fan inside the unit behind top door run when you turn it on and turn up the thermostat?

Advertisement

__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Reply


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
HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5 baironhorse HVAC 41 10-22-2014 04:59 PM
Lennox Whisper Heat G20 series occasionally pops when igniting CubsWin HVAC 16 01-31-2011 09:59 PM
Problem with Trane gas furnace quovadis HVAC 17 12-22-2008 02:12 PM
Lennox furnace problem devgill08 HVAC 5 12-11-2008 08:38 PM
Furnace problem...solution per contractor...please take a look gone_fishing HVAC 5 12-01-2008 06:40 PM




Top of Page | View New Posts