Thread Tools Search this Thread Display Modes
Old 09-28-2012, 08:13 AM   #1
1 Rivet Member
1974 27' Overlander
Woodruff , Wisconsin
Join Date: Apr 2012
Posts: 5
Suburban NT-32A furnace help needed

Our NT-32A Suburban furnace is having issues. Here are the symtoms...We can light the pilot light and it stays lit. Everything seems like it works well through the first cycle. The fan goes on, the burner unit starts up, we feel heat, the burner unit goes off, the fan continues to run for a while and then turns off. When the temp goes below what the thermostat is set at you'd expect the process to start all over again, it doesn't! The fan might turn on for 20 or 30 seconds, but then it tuns right off. No heat! We have found if we push in the reset button it will kick off the burner and we have heat. I have looked in our owners manual, but not being too mechanical I have yet to find this issue in the troubleshooting guide. So far we have replaced the thermostat (didn't know if we needed it, but it was cheap!) We purchased a thermocouple (we didn't install it) but since the pilot light stays on we aren't convinced that is the issue either. Any suggestions out there? Much appreciated!

new owner is offline   Reply With Quote
Old 09-28-2012, 10:09 AM   #2
Rivet Master
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,592
There are a couple of possibilities, both hard to find to be sure. There is an over limit Klixon thermostat like device inside the heating section of the furnace. When the air temp goes over the pre set limit of it, it turns the burner gas off. They are somewhat unreliable, especially on older units. They cool down and should re establish contact, but don't, and the furnace will not fire properly on the next start up. The second possibility that comes to mind is the relay inside which controls various functions. They can get old and tired too.

I don't think you have any thermocouple issue, as your pilot light remains lit. Your sail switch is working, or you would not have heat at any time. What I don't understand, because I have never seen or heard of the problem is that "The fan might turn on for 20 or 30 seconds, but then it tuns right off". I can think of no reason for that on the old non electronic ignition furnace you have. (oops, on re reading prior to posting, I thought of a reason, could be the anticipator in the thermostat is set too "fast" and all you are getting is a relatively quick heat demand then the thermostat turns off from the anticipator)

I know I can sound like a broken record on this issue when I post, but any 38 year old furnace can have so many issues, some safety related, that you might consider replacing it with a new one. Often you fix one thing and another crops up. If you are not big on taking the furnace out, working on it, putting it back in, having it work (maybe) and repeat, think about replacement. On those years and models of Suburban Furnaces there was a long standing recall for a defective crossover tube which was fixed in a recall. However, if yours was not fixed, it is still a safety issue, and Suburban no longer has the recall parts available, nor do they support any parts for those furnaces.

A new furnace will have electronic ignition, so no more pilot lighting. It also will probably have a somewhat lower current draw from the fan motor, good if you camp without power available.

idroba is offline   Reply With Quote
Old 09-28-2012, 10:21 AM   #3
1 Rivet Member
1974 27' Overlander
Woodruff , Wisconsin
Join Date: Apr 2012
Posts: 5
Thank you very much! The decision to fix or replace just got a whole lot easier. Believe it or not, the previous owners kept a 3 ring binder with everything in it - including the recall letter. I read it, but didn't understand it. Thank you for the explaination. I'm thinking a new furnace is in my future
new owner is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
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

Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:41 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.