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05-13-2025, 09:28 AM
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#1
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3 Rivet Member 
2002 25' Classic
Kalama
, Washington
Join Date: Feb 2003
Posts: 205
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Gas heated hot water
Our start cycle is normal, but it stops heating before reaching the set temperature. It then begins a restart, which also fails. Other than cleaning the orifice, are there some likely TS tips I can try to diagnose/Rx our heater?
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05-13-2025, 11:04 AM
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#2
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Rivet Master 
2010 30' Classic
Warren
, Manitoba
Join Date: Apr 2006
Posts: 1,505
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Good possibility that thermostats have failed. They are easy to replace.
__________________
ACI #7394
2012 GMC 2500 HD Duramax Denali
2010 Classic Limited 30' ,
1994 Excella 34' 1987 Limited 34', 1976 31' Sovereign, 1976 Argosy 22' Gone to new homes
Hensley Hitch
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05-13-2025, 03:59 PM
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#3
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Rivet Master 
1994 30' Excella
Mississauga
, Ontario
Join Date: Jun 2004
Posts: 1,314
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The orifice for the gas is a ruby so don’t use a pin to clean. It will ruin it. Soak in alcohol. That’s it. Like said probably a temp sensor on the tank.
__________________
Al and Jean
BRN 3845
TAC ON-3
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05-13-2025, 05:06 PM
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#4
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3 Rivet Member 
2002 25' Classic
Kalama
, Washington
Join Date: Feb 2003
Posts: 205
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CBWELL, Big Al - thanks for the assists. Five videos later, I found one that included gas dynamics. After disassembly and some housekeeping that really wasn't necessary, the culprit turned out to be a misadjusted airflow tube. Once I was taught its function and proper adjustment, we're back to nominal again.
Both of your suggestions were included, referenced in the videos and checked. Happy camping again!
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05-14-2025, 11:44 AM
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#5
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Rivet Master 

2015 27' Flying Cloud
Portland
, Oregon
Join Date: Nov 2009
Posts: 701
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Quote:
Originally Posted by nwclassic
CBWELL, Big Al - thanks for the assists. Five videos later, I found one that included gas dynamics. After disassembly and some housekeeping that really wasn't necessary, the culprit turned out to be a misadjusted airflow tube. Once I was taught its function and proper adjustment, we're back to nominal again.
Both of your suggestions were included, referenced in the videos and checked. Happy camping again!
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Can you post the link to the video?
__________________
The ability to follow instructions is highly underrated.
Always be wary of stupid people in large numbers.
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05-14-2025, 12:51 PM
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#6
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3 Rivet Member 
2002 25' Classic
Kalama
, Washington
Join Date: Feb 2003
Posts: 205
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w/in these
Browsing history showed these. Not sure which one ultimately educated me,
but they'll get you in the ballpark.
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05-14-2025, 02:51 PM
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#7
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3 Rivet Member 
2017 25' Flying Cloud
Woodway
, Texas
Join Date: Oct 2017
Posts: 184
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Also a good idea to check your airflow tube adjustment with the door to the unit closed. Somehow, ours would spit and sputter but when the door was opened, it 'settled down'.
Opened the tube up just a tad more, closed the door and it worked perfectly. Had this same problem with a Jayco we owned prior.
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05-14-2025, 10:27 PM
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#8
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3 Rivet Member 
2002 25' Classic
Kalama
, Washington
Join Date: Feb 2003
Posts: 205
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The takeaway
Good point - What's important, is that proper gas operation gives a quiet, blue flame... the result of the correct gas/oxygen ratio. Changing elevation, changes that ratio (as does opening/closing the access door. If it spits and coughs, or sounds like a jet engine, a tube adjustment is required.
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05-18-2025, 04:38 PM
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#9
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Rivet Master 
2016 30' International
redondo beach
, California
Join Date: Feb 2017
Posts: 848
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Since we go from sea level to 6,000 + feet we carry a thingy tool and adjust air flow a lot for that clean burn.
__________________
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