Thread Tools Search this Thread Display Modes
Old 01-23-2020, 05:05 PM   #1
2 Rivet Member
Join Date: Jan 2014
Posts: 58
2002 Classic furnace fan stays on?

Ok, furnace is acting up. Just changed the tstat and it worked fine for a while. Now, the fan will not turn off when I set the tstat to off. Even bypassed the tstat and separated the two control wires so the circuit was broken. Still, fan stays on. Hmmmm... thoughts?
I did notice a red light when I removed the cover but it no longer blinks. And I reset the heater via the switch a few times. Click image for larger version

Name:	IMG_4109.jpg
Views:	18
Size:	259.9 KB
ID:	359750 Click image for larger version

Name:	IMG_4113.jpg
Views:	19
Size:	282.6 KB
ID:	359751Click image for larger version

Name:	IMG_4107.jpg
Views:	16
Size:	335.7 KB
ID:	359752
umasslax is offline   Reply With Quote
Old 01-23-2020, 06:44 PM   #2
Rivet Master
Al and Missy's Avatar

2002 30' Classic S/O
Melbourne Beach , Florida
Join Date: Nov 2013
Posts: 4,149
My Atwood service manual says it is the relay. Assuming your furnace is original, the relay is a separate component and is replaceable. On the newer furnaces the relay is on the circuit board. The relay is supposed to turn power on to the fan when the thermostat closes and delay turning the fan off for a while to cool the heat exchanger when the thermostat opens. The relay is a block with 4 terminals on top. One of the thermostat wires should connect to it.

“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
Al and Missy is offline   Reply With Quote
Old 01-24-2020, 08:17 AM   #3
Rivet Master
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 2,301
Al is correct the fan control relay is stuck on. You can often get it working again for a while if you remove it, rap on it with a screwdriver handle or similar (big enough to knock it hard, but not enough to crack or break it) . If that works you can replace it when you can find one or have it delivered. The bang on it trick works when the contacts get welded together (happens when it ages and the contacts meet at a corner or point rather than across the flat surface) and usually can work for maybe 10-100 cycles. If it is a spring or a lever arm or mount that is broken then it will likely not temporarily fix the issue.
BayouBiker is online now   Reply With Quote
Old 01-24-2020, 05:58 PM   #4
2 Rivet Member
Join Date: Jan 2014
Posts: 58
Thanks. Looks like it was the sail switch. Just took it out, oiled it and the daggum think works. Just order a new one. There are three gates. Tstat , sail switch and limit switch. All pass the 12 volt along. Thanks everyone!!!
umasslax is offline   Reply With Quote
Old 01-25-2020, 01:21 PM   #5
Rivet Master
TBRich's Avatar

2006 19' Safari SE
Tucson , Arizona
Join Date: Jun 2007
Posts: 4,620
Images: 64
Just an FYI I discovered: When our furnace decides to get finicky, and that red light is on and blinking, if I turn the thermostat completely off, then on again, it resets and the red light goes off .. and the reset switch will be functional.
TB & Greg and Abbey Schnauzer
AirForums #21900 . Membership Chair & PastPrez, 4CU/WBCCI
Travel Log: AZBambi...On the Road Again
TBRich 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Overhead Locker Door Stays - Spring Cylinders dbj216 Cabinets, Counter Tops & Furnishings 6 06-22-2010 04:42 AM
Atwood Heater - Red light stays on! Moonstruck Furnaces, Heaters, Fireplaces & Air Conditioning 4 10-06-2009 03:29 PM
'76 Soveriegn Stays in the Family drdehaven Member Introductions 4 08-29-2009 12:24 PM
circuit breaker for 12v stays off airhaus Batteries, Univolts, Converters & Inverters 6 06-06-2009 10:38 AM
Stays lit-water heater pilot light doorgunner Water Heaters, Filters & Pumps 4 07-01-2008 06:15 PM

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

All times are GMT -6. The time now is 12:53 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.