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11-02-2018, 01:09 PM
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#1
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Furnace propane supply
We're on our 3rd Montana and have a problem I've never experienced with the propane supply to the furnace.
Sometimes, more often than not, the furnace will not ignite and run when being fed from the ODS propane cylinder. Usually try it 2-3 times and still won't but if I manually switch it to the DS cylinder it will ignite and run as it's supposed to. Both cylinders have plenty of propane and I have even switched sides with them and get the same results so that should rule them out as the problem.
I have also replaced the pigtail on the ODS with a new one so that should also be ruled out. My only other thought is maybe bad regulator/auto switchover. The cooktop, oven, and water heater all work just fine. Neither cylinder has recently been filled.
We are full-timers and really need this thing to work as it should this winter! 
Any ideas from the experts?
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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11-02-2018, 01:32 PM
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#2
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Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
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When the furnace doesn't work will the W\H, stove, cooktop still work? Try closing the tank valves bleed off the lines then open the tank valves very slowly.
__________________
Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails 
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11-02-2018, 01:49 PM
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#3
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by BuilderBob
When the furnace doesn't work will the W\H, stove, cooktop still work? Try closing the tank valves bleed off the lines then open the tank valves very slowly.
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Yes, all other appliances work fine and I always open valves at a snail's pace. Was very careful about that when switching tanks to other side.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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11-02-2018, 02:06 PM
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#4
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Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
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Do you leave both tanks open all the time so the auto switch can do it job. I know some other that like to leave one off till it runs out and then go open the other tank witch does not make much sense that is what the auto switch over is for! It mite be the auto switch over! but that should affect all the gas not just one thing but I have seen strange thing before!
__________________
Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails
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11-02-2018, 02:18 PM
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#5
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,690
M.O.C. #12947
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Just to eliminate a tank problem, try swapping the tanks, left to right and the right to left, just to see if there is a problem with one of the tanks. Then try the furnace again. Otherwise, you might be better off getting a mobile tech to come out and check things.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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11-02-2018, 02:20 PM
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#6
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by BuilderBob
Do you leave both tanks open all the time so the auto switch can do it job. I know some other that like to leave one off till it runs out and then go open the other tank witch does not make much sense that is what the auto switch over is for! It mite be the auto switch over! but that should affect all the gas not just one thing but I have seen strange thing before!
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Both tanks are always open except when I remove an empty to take and have filled. Have you ever heard of a regulator input port being partially clogged/defective not allowing proper flow?
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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11-02-2018, 02:23 PM
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#7
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by rohrmann
Just to eliminate a tank problem, try swapping the tanks, left to right and the right to left, just to see if there is a problem with one of the tanks. Then try the furnace again. Otherwise, you might be better off getting a mobile tech to come out and check things.
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I already did the side to side switch of the tanks and get the same result. That should have ruled out tank(s). I think replacing the regulator/switchover would be more cost effective than tech labor.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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11-02-2018, 03:06 PM
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#8
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,359
M.O.C. #4831
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Montana keeps moving the location of the Changeover Regulator from side to side. So I have to ask, is the Changeover Regulator on the ODS side and the small red Regulator on the DS?? Also, is the side where gas is *NOT* flowing from the same as the red Regulator?
Those red regulators are notorious for causing problems. The Changeover Regulator is less so. But I believe you have a regulator problem and changing it is the next thing to try.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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11-02-2018, 03:23 PM
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#9
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by carl n susan
Montana keeps moving the location of the Changeover Regulator from side to side. So I have to ask, is the Changeover Regulator on the ODS side and the small red Regulator on the DS?? Also, is the side where gas is *NOT* flowing from the same as the red Regulator?
Those red regulators are notorious for causing problems. The Changeover Regulator is less so. But I believe you have a regulator problem and changing it is the next thing to try.
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The ODS is where the main regulator/switchover is and is the problematic side. The DS is where the small red regulator is and it works fine.
Yes, unless someone has a better idea in a couple of days I think new regulator is in order. I don't see that it could be much else. If I get a new one I think I will get a 350,000 BTU High Capacity instead of the standard 225,000 BTU. Your ideas on that?
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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11-02-2018, 03:35 PM
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#10
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,923
M.O.C. #20477
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Life would be simpler if we said port or starboard or even right or left.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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11-02-2018, 04:11 PM
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#11
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by AZ Traveler
Life would be simpler if we said port or starboard or even right or left.
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Yes it would. Or how about Gee or Hah? 
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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11-02-2018, 04:56 PM
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#12
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,690
M.O.C. #12947
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What about the rigs that have doors on both sides? Then what do you do, maybe curb side and road side?
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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11-02-2018, 07:04 PM
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#13
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,923
M.O.C. #20477
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When I did a lot of offloading we had spotters use driver and passenger so as not to confuse folks depending on which way they looked at a rig.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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11-02-2018, 08:36 PM
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#14
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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To get back to your original problem, you need to get someone to check the propane output from that regulator. Since the furnace probably uses a lot more than the other things you may have a pressure problem.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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11-03-2018, 05:27 AM
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#15
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by DQDick
To get back to your original problem, you need to get someone to check the propane output from that regulator. Since the furnace probably uses a lot more than the other things you may have a pressure problem.
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The regulator output should be fine because the furnace works great when fed by the DS LP tank. Maybe the ODS regulator INPUT port is bad.
As stated before, I think I will replace the regulator/switchover with a high capacity one (350,000 BTU vs 225,000 BTU).
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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11-07-2018, 02:29 PM
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#16
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Montana Fan
Join Date: Nov 2011
Location: Albany
Posts: 407
M.O.C. #11972
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Just a passing thought on auto switchover. I don't ever want to be 100% out of propane so I leave the switchover set to one side. When that tank is empty it only takes a minute to go outside and switch to the other tank. That same day, I refill the empty tank.
__________________
2012 3150RL. G614 tires. Hardwired surge protector. Level-Up Hydraulic leveling.
2013 F-350 Lariat 6.7 PSD SRW SC LB 4X4 OEM hitch, air self-leveling on rear. 57-gallon replacement fuel tank. DieselSite water separator/fuel filter.
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11-07-2018, 02:45 PM
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#17
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Montana Fan
Join Date: Sep 2018
Location: Reno
Posts: 291
M.O.C. #22620
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Had a similar problem. Dealer found and fixed crimped gas line under one of the tanks. Hopefully, my last warranty issue.
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