Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
Old 01-03-2016, 06:25 PM   #1
Member
 
Join Date: Sep 2013
Posts: 63
Atwood Furnace AFMD30111 Issue

Looking for advice from you furnace experts. I had the trailer to the dealer 4 times and it's still happening. The problem - the furnace is cycling off of the limit switch. It runs for 10-12 mins and then the flame shuts off, but the fan remains on. After about 1 min and 30 seconds the flame will reignite. It will do this until it reaches the thermostat temp. The dealer replaced the control board. Still does it.

I decided to do a little troubleshooting. I confirmed it is limiting. With a volt meter across the limit switch, I get 0 volts until the switch opens. Upon which I get 24 volts. I replaced the limit switch just to rule it out and the problem persists. I then started to think maybe it's an air flow issue. Either with the ducting or blower motor. I get good flow from the three floor registers and the one below the shower. I loosened the screws on the external door cover and pulled it away about 1/2 inch. The furnace ran for 45 mins without interruption until it reached the thermostat temp. Tightening the screws causes the furnace to cycle in about 12 mins.

So, does this sound like the blower motor or something else?

Oh yea, the trailer is a 2016 Lacrosse 327RES.

Thx


Sent from my iPhone using Forest River Forums
__________________
2914 Tracer 2950BHS
Griswalds is offline   Reply With Quote
Old 01-10-2016, 01:55 PM   #2
Member
 
Join Date: Sep 2013
Posts: 63
I fixed it. The flexible ducting from the furnace to the bathroom only needed a length of 5 feet. There was over 12 feet of ducting installed. It was looked like a coiled snake. I removed over 6 feet of the flexible ducting and the furnace ran for over 50 mins continuously until it reached the thermostat temp.


Sent from my iPhone using Forest River Forums
__________________
2914 Tracer 2950BHS
Griswalds is offline   Reply With Quote
Old 01-10-2016, 03:32 PM   #3
Senior Member
 
Join Date: Mar 2014
Location: Mountain Foothills of Southern Alberta
Posts: 2,048
Thumbs up

Good to hear you got it fixed.
__________________

2007 Surveyor SV230
- 200 Watts Solar/MPPT Controller - 220 AH Battery Bank (Two-GC2) - 600 watt PSW Inverter - (2) 2000 watt Inverter Generators - LED Lighting
2009 F150 - 5.4 Litre with Tow Package

Boon Docking 99% of the time.
boondocking is offline   Reply With Quote
Old 01-10-2016, 03:57 PM   #4
Senior Member
 
PhoneDude 8289's Avatar
 
Join Date: Sep 2013
Location: Texas
Posts: 1,183
I also removed about 8' total of the flex duct in the storage area. Added hard aluminum 3" 90º ells to the furnace taps. Improved airflow considerably to the living area. I did not have the limit cycling problem that I was aware of, just poor to almost no airflow to the living area at the rear of the rv.
__________________
Joe & Beverly
2014 Ram 2500 CTD, CC, SB
2014 8289WS lifted
PhoneDude 8289 is offline   Reply With Quote
Old 01-19-2016, 07:21 PM   #5
Senior Member
 
MNtraveler's Avatar
 
Join Date: Oct 2015
Posts: 2,409
Wow, good find and good fix!
__________________
2016 FR Forester 2401R
Towing 2014 Honda CR-V
MNtraveler is offline   Reply With Quote
Reply

Tags
furnace

Thread Tools
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


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 02:18 PM.