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 01-20-2011, 07:39 AM   #1
Newbie
 
Join Date: Jan 2011
Posts: 6
Rewards Points: 0
Share |
Default

Lennox Conservator II Won't Stay Lit


I have a Lennox Conservator II. Last year it started having problems with the ignition. This was exacerbated by the fact that the flame will only burn for a couple minutes and then shut off. Even when you are nowhere near the desired temperature. Then it has to try to re-light itself. You could hear it trying to light but the arc of electricity would not jump across. I replaced the ignition assembly and it seemed to help for a short period of time.

Now it really struggles to light itself.

What I don't understand is why after it lights itself does it shut the flame off after only a few minutes of running and then try to re-light itself. It seems to me that until the thermostat reads the desired temperature that the flame should stay on.

Please Help!!

Brad

bkrinke is offline   Reply With Quote
Old 01-20-2011, 07:46 AM   #2
Member
 
Join Date: Sep 2010
Posts: 449
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


Besides checking flame sensor 'connection', try cleaning sensor by one of the burners with emery cloth, fine steel wool or sandpaper.

For expert techs post model # of unit, not just brochure model.

diyorpay is offline   Reply With Quote
Old 01-20-2011, 07:59 AM   #3
Newbie
 
Join Date: Jan 2011
Posts: 6
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


I don't intend on sounding ignorant but since I simply don't know I guess that cannot be avoided.

I assume any kind of sensor would have to have a wire back to the control box. The only wire that runs anywhere near the flames is the ignition wire.

I don't see any sensors that could be a flame sensor. There are a number of wires that run down into a lower box where the fan is located but they cannot possibly check for flames down there.

I opened the fan box and all of the wires running from the upper area down to the fan area are going into another module. Nothing goes back up.

I did find a small black box that has temperatures listed on it. They start at 80 and go up. The temp is set at 100. Could this be the issue?

Brad

Last edited by bkrinke; 01-20-2011 at 08:18 AM.
bkrinke is offline   Reply With Quote
Old 01-20-2011, 09:04 AM   #4
Newbie
 
Join Date: Jan 2011
Location: Ironwood, Michigan
Posts: 17
Rewards Points: 0
Send a message via MSN to terrylueders
Default

Lennox Conservator II Won't Stay Lit


The flame sensor wire is hiding somewhere. The ignitor is usually on one side and the senor on the other side. If you look into the flame camber you should see a long metal rod that is about 1/8 inch thick. This rod will be in the flame to sense it. And, should have a wire to it. Easy to clean or replace. Keep looking.
terrylueders is offline   Reply With Quote
Old 01-20-2011, 09:16 AM   #5
Newbie
 
Join Date: Jan 2011
Posts: 6
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


Found it. It's on the same assembly as the ignition. They are both discolored. I will remove and sand them both!!
bkrinke is offline   Reply With Quote
Old 01-20-2011, 09:31 AM   #6
Newbie
 
Join Date: Jan 2011
Location: Ironwood, Michigan
Posts: 17
Rewards Points: 0
Send a message via MSN to terrylueders
Default

Lennox Conservator II Won't Stay Lit


Do not touch the ignitor or sand it or even look at it too hard. It is very touchy. That is if you have a Hot Surface Ignitor. Good Luck.
terrylueders is offline   Reply With Quote
Old 01-20-2011, 10:11 AM   #7
Newbie
 
Join Date: Jan 2011
Posts: 6
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


Ok. Sanded the parts. For now it is lighting itself. I still wonder, is the flame supposed to stop before the temperature reaches the desired level? This causes it to re-light numerous times during the heating process. Perhaps it is designed to do this to prevent the unit from over heating?
bkrinke is offline   Reply With Quote
Old 01-20-2011, 11:36 AM   #8
Newbie
 
Join Date: Jan 2011
Location: Ironwood, Michigan
Posts: 17
Rewards Points: 0
Send a message via MSN to terrylueders
Default

Lennox Conservator II Won't Stay Lit


Yes! It is working properly. Good luck.
terrylueders is offline   Reply With Quote
Old 01-20-2011, 05:57 PM   #9
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


Quote:
Originally Posted by bkrinke View Post
Ok. Sanded the parts. For now it is lighting itself. I still wonder, is the flame supposed to stop before the temperature reaches the desired level? This causes it to re-light numerous times during the heating process. Perhaps it is designed to do this to prevent the unit from over heating?
It does that BECAUSE the unit is over heating. Just a WAG but are you dealing with an old G12? If so you need to have that thing inspected by good tech.
Marty S. is offline   Reply With Quote
Old 01-20-2011, 06:04 PM   #10
Newbie
 
Join Date: Jan 2011
Posts: 6
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


Quote:
Originally Posted by Marty S.
It does that BECAUSE the unit is over heating. Just a WAG but are you dealing with an old G12? If so you need to have that thing inspected by good tech.
How do I know if it is a G12? And can I stop it from over heating?
bkrinke is offline   Reply With Quote
Old 01-20-2011, 06:17 PM   #11
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,411
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


Should have a sticker inside beside the burners usually on the left side that has a model # like G12 or G16. Get us the complete model #. Need to do a temp rise test while it is running and compare it to the specs on that sticker. AC coil may be dirty and reducing airflow etc.
__________________
"Cut it twice and it is still too short".
yuri is offline   Reply With Quote
Old 01-21-2011, 12:09 AM   #12
Newbie
 
Join Date: Jan 2011
Posts: 6
Rewards Points: 0
Default

Lennox Conservator II Won't Stay Lit


Quote:
Originally Posted by yuri
Should have a sticker inside beside the burners usually on the left side that has a model # like G12 or G16. Get us the complete model #. Need to do a temp rise test while it is running and compare it to the specs on that sticker. AC coil may be dirty and reducing airflow etc.
Ok. There is a short at the base of the ignition. I have adjusted the cord into an optimal location where it sparks continuously!! Yeah!!

But wait there's more. When I run the ignition w/o natural gas it works perfectly. As soon as even a small amount of natural gas is introduced the sparks stop. When I stop and gas and blow the residual away the sparks start right back up. Go figure.

Any ideas??!!??

G12E by the way. The part number is partially damaged and I cannot read it.

bkrinke is offline   Reply With Quote
Reply

Tags
conservator ii, ignition, lennox


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 burner won't stay on stevea7777 HVAC 47 03-14-2014 08:00 AM
Lennox 80UHG3 lites up but wont stay on. Cajuntiny Site Feedback and Suggestions 0 01-14-2011 10:43 PM
Lennox 80UHG will not stay lit Williamlane HVAC 5 01-11-2011 10:50 PM
Lennox Whisper Heat burners won't stay lit Gaff519 HVAC 2 12-09-2010 11:32 AM
Help with lennox furnace will not stay on. slowhand HVAC 4 12-06-2009 08:10 PM




Top of Page | View New Posts

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