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Topic: Atwood furnace  (Read 836 times) previous topic - next topic

Atwood furnace

Front furnace works great , rear furnace starts with cool air , warms up ( but not to temp of front , then back to cool air then shuts off . This cycle keeps repeating at thermostat calls for heat .
Since airflow is good , does it indicate thermocouple ??
Jimmy
2003 U295 3620

Re: Atwood furnace

Reply #1 –
Exhaust from rear furnace does not feel as strong as front unit , not scientific , just a cold hand against it
Jimmy
2003 U295 3620

Re: Atwood furnace

Reply #2 –
Lower air flow could be due to a number of causes, but can easily cause your symptom.

First check if for voltage at the furnace (lower outside furnace cover to access).
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Atwood furnace

Reply #3 –
Does your manual indicate size/output of your furnaces? Usually the rear furnace is smaller. I think it may be because the bedroom area is usually not kept as warm as front of coach, and has fewer windows.
Nitehawk,  Demolition Lady, & our NEW master, Zippy the speeding BB cat.
1989 Grand Villa 36' ORED
Oshkosh chassis, 8.2 DD V8
2006 Saturn Vue AWD

Re: Atwood furnace

Reply #4 –
Just stopped for quick break and cranked rear furnace to check symptoms , fan sounded rough and slow on start up .
Moves me toward Brett's idea , voltage or bad fan .
Does the list of repairs ever get shorter ???
Jimmy
2003 U295 3620

Re: Atwood furnace

Reply #5 –
Brett
When I check for voltage should furnace be switched on and thermostat calling for heat . ??
Jimmy
2003 U295 3620

Re: Atwood furnace

Reply #6 –
Quote from: Jimmyjnr –
Brett
When I check for voltage should furnace be switched on and thermostat calling for heat . ??

Yes, I would check it under load.  A bad or corroded connection "upstream" or on the ground side (just as likely) could read good voltage under no load, but drop like a pet rock under load.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Atwood furnace

Reply #7 –
Quote from: Jimmyjnr –

Does the list of repairs ever get shorter ???
In a word no, ya just have to learn to live with some not so important small things until you can get to them.
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: Atwood furnace

Reply #8 –
Quote from: bbeane –
In a word no, ya just have to learn to live with some not so important small things until you can get to them.

 ^.^d  Truer words were never spoken.
Robert
Build # 5304
1998 34' U270 Cummins 6CTA8.3

Re: Atwood furnace

Reply #9 –
One also has to learn which small items can turn into major problems that will bite you hard if not addressed quickly.
Nitehawk,  Demolition Lady, & our NEW master, Zippy the speeding BB cat.
1989 Grand Villa 36' ORED
Oshkosh chassis, 8.2 DD V8
2006 Saturn Vue AWD

Re: Atwood furnace

Reply #10 –
Checked the furnaces and front is double the output of the rear , consumes twice the current which must relate to motor size and air flow ??
Jimmy
2003 U295 3620

Re: Atwood furnace

Reply #11 –
It appears that the rear furnace is 16,000 BTU's and the front is 35'000. See the specs on Barry B's page.
The selected media item is not currently available.Bill&Doris 97 U270 36'
University of Parris Island Class of 66
Semper Fi  Build# 5174 MC#17094

Re: Atwood furnace

Reply #12 –
Seems crazy since the rear also heats the wet bay and tanks ?
Would it be possible to fit larger furnace or would electrical / propane feed need to be upgraded
Jimmy
2003 U295 3620

Re: Atwood furnace

Reply #13 –
Quote from: Jimmyjnr –
Seems crazy since the rear also heats the wet bay and tanks ?
Would it be possible to fit larger furnace or would electrical / propane feed need to be upgraded

Bigger rear furnace would add to the short cycling it already has.

"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4