Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 10-18-2021, 12:47 PM   #1
Junior Member
 
Join Date: Oct 2021
Posts: 9
Atwood furnace - clunking noise after shutting off

I have an Atwood furnace in my unit which is a 2019 Keystone Cougar and the furnace will run and once the temperature is right, it shuts off the heat and then the fan runs for a period of time. After the fan shuts off, within 15 seconds I hear a relatively loud clunking noise. Is this normal?

I was searching online and all I have been able to find is information about normal household furnaces and when that happens it's due to a filter needing to be cleaned. From my understanding, which is limited, the furnaces in an RV don't have a filter, so I am not sure what is causing the noise.

Any information would be greatly appreciated.
mermald is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 10-18-2021, 01:01 PM   #2
Senior Member
 
Join Date: Nov 2015
Posts: 18,864
Sounds like a loose air or combustion wheel
Motor is dual shaft with room air wheel on one shaft and combustion air wheel on other side shaft

Both held on shaft via hex screw...if loose wheel could clunk as fan winds down

Nothing else is rotating in furnace
__________________
Is it time for YOUR Medication or Mine?
Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
Old-Biscuit is offline   Reply With Quote
Old 10-18-2021, 01:05 PM   #3
Junior Member
 
Join Date: Oct 2021
Posts: 9
Quote:
Originally Posted by Old-Biscuit View Post
Sounds like a loose air or combustion wheel
Motor is dual shaft with room air wheel on one shaft and combustion air wheel on other side shaft

Both held on shaft via hex screw...if loose wheel could clunk as fan winds down

Nothing else is rotating in furnace
How difficult is that to fix?
mermald is offline   Reply With Quote
Old 10-18-2021, 01:24 PM   #4
Senior Member
 
Join Date: Nov 2015
Posts: 18,864
Remove exterior access panel
Remove cover over motor to expose air wheel
Long-handled Allen Wrenches (9/64" and 1/8" for the air wheel and the combustion wheel)


What is the Model Number?
AFM, 85/89 etc
__________________
Is it time for YOUR Medication or Mine?
Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
Old-Biscuit is offline   Reply With Quote
Old 10-18-2021, 01:54 PM   #5
Junior Member
 
Join Date: Oct 2021
Posts: 9
Quote:
Originally Posted by Old-Biscuit View Post
Remove exterior access panel
Remove cover over motor to expose air wheel
Long-handled Allen Wrenches (9/64" and 1/8" for the air wheel and the combustion wheel)


What is the Model Number?
AFM, 85/89 etc
DFMD36131 is what is listed on the unit
mermald is offline   Reply With Quote
Old 10-18-2021, 05:16 PM   #6
Senior Member
 
Join Date: Nov 2015
Posts: 18,864
DFM35131......
Dometic Furnace
Medium size
35K btu rated
131....Denotes fuel/access/valve type
**Documentation uses AF (Atwood Furnace....Dometic acquired Atwood)

Here is an installation manual ....EXPLODED View on pg 9
http://techsupport.pdxrvwholesale.co...m-Furnaces.pdf
__________________
Is it time for YOUR Medication or Mine?
Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
Old-Biscuit is offline   Reply With Quote
Old 10-18-2021, 06:35 PM   #7
Junior Member
 
Join Date: Oct 2021
Posts: 9
Quote:
Originally Posted by Old-Biscuit View Post
DFM35131......
Dometic Furnace
Medium size
35K btu rated
131....Denotes fuel/access/valve type
**Documentation uses AF (Atwood Furnace....Dometic acquired Atwood)

Here is an installation manual ....EXPLODED View on pg 9
http://techsupport.pdxrvwholesale.co...m-Furnaces.pdf
Looks like I may need to call a professional....
mermald is offline   Reply With Quote
Reply

Tags
ace, atwood, furnace, noise



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
Atwood water heater not shutting off automatically budh9534 RV Systems & Appliances 5 03-29-2021 10:30 PM
Water pump run time after shutting faucet off? baam5774 Class A Motorhome Discussions 9 09-05-2020 01:30 PM
Aqua hot shutting off after ~1 HR buddy110 Entegra Owner's Forum 14 11-21-2019 02:15 PM
On-off on off on off off off rear view camera Bahcml Newmar Owner's Forum 5 08-12-2019 11:44 PM
Intervac shutting off after only a few minutes of use Burly Tiffin Owner's Forum 6 12-04-2013 08:42 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 11:59 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.