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 12-12-2012, 06:08 PM   #1
Newbie
 
Join Date: Sep 2012
Posts: 6
Share |
Default

Lennox Furnace - Primary or Secondary Limit Switch Open


My furnace stopped working today. It will turn on for a few seconds and then back off again, occasionally turning on for closer to a minute. The lights indicate that a limit switch is open. I've read enough where I think I can figure out if the limit switch is the problem by taking out the wires and bypassing the switch to see if it works and then just get a new limit switch. I don't know what the limit switches are, however. Can anyone tell if this is a good idea, and where in the attached pictures the limit switches are that I should be testing?
Attached Thumbnails
Lennox Furnace - Primary or Secondary Limit Switch Open-wp_20121212_019.jpg   Lennox Furnace - Primary or Secondary Limit Switch Open-wp_20121212_020.jpg  


Last edited by georgemeaders; 12-12-2012 at 07:19 PM.
georgemeaders is offline   Reply With Quote
Old 12-12-2012, 06:11 PM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,077
Default

Lennox Furnace - Primary or Secondary Limit Switch Open


Where is the picture. Go to (Go Advanced- manage attachments) to upload one. What is the complete model # of the furnace and serial #. Several Lennox techs here.

__________________
"Cut it twice and it is still too short".
yuri is offline   Reply With Quote
Old 12-12-2012, 06:28 PM   #3
Newbie
 
Join Date: Sep 2012
Posts: 6
Default

Lennox Furnace - Primary or Secondary Limit Switch Open


Sorry about that, one image is attached now. I will have to wait until I get back from work to check on the actual model # of the furnace in question, unless one of the pictures I took this morning has the model # included.
georgemeaders is offline   Reply With Quote
Old 12-12-2012, 07:02 PM   #4
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,077
Default

Lennox Furnace - Primary or Secondary Limit Switch Open


Looks like a counterflow/down flow G24 which is a VERY nasty furnace to work on. Limit controls are in the fan compartment and you need to remove the venting etc. I would HIGHLY advise you to call an experienced Lennox tech to deal with that problem. Not something I can walk you thru over the internet w/o other problems occuring. Sorry.
__________________
"Cut it twice and it is still too short".
yuri is offline   Reply With Quote
The Following User Says Thank You to yuri For This Useful Post:
ben's plumbing (12-12-2012)
Old 12-12-2012, 07:21 PM   #5
Newbie
 
Join Date: Sep 2012
Posts: 6
Default

Lennox Furnace - Primary or Secondary Limit Switch Open


Yikes, that sounds nasty. I added another picture of where I think you're referring to. I might go ahead and call the guy who comes out to service it every couple years and see if he can take a look at it. I was hoping to be able to save a few bucks on it, but don't want to risk screwing things up too badly.
georgemeaders is offline   Reply With Quote
The Following User Says Thank You to georgemeaders For This Useful Post:
ben's plumbing (12-12-2012)
Reply

Tags
furnace, lennox, lennox-no heat, limit switch


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
Furnace limit switch question (need answer ASAP) Lemkie HVAC 26 12-11-2012 05:58 PM
Where to buy a Lennox limit switch in Pa Blackbirdin HVAC 3 11-07-2012 03:10 PM
Furnace fan won't switch on--unpredictable intermittent problem arvonon HVAC 3 01-22-2012 04:46 PM
Changing A Double Switch to a single pole switch and a dimmer switch loydbrahn Electrical 0 11-08-2011 11:00 PM
Comfortmaker RPJII - 4 flashes - open high limit switch nisad HVAC 7 12-08-2006 11:33 AM




Top of Page | View New Posts

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