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Old 06-22-2019, 02:06 PM   #1
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1976 Argosy 26
Pullman , Washington
Join Date: Jun 2012
Posts: 10
LP - the smoking gun?

Prepping my 28 ft. 1976 Argosy for our first trip of the year on Memorial Day, my new Dometic fridge started flashing ĎLPí while it was on shore power (I donít remember it doing that before). When I tried disconnecting shore power, it tried to light the pilot, couldnít, then stopped trying. Wondering if my LP was out, I tried the stove, which lit up just fine. Not too worried as the fridge has been the most non-functional thing in the whole trailer since I got it 3 years ago, we headed out.

With the temperature plummeting, I decided to turn on the furnace, but I could not light a pilot light even after many attempts and some tricks Iíve learned over the years. Later, the tankless hot water heater also would not light, although I did see it light once briefly when we returned from the trip (additional tries were fruitless).

Getting under the trailer, it looks like the propane line Tís off at the furnace, the fridge, the tankless hot water heater, and finally the stove/oven. If the stove still works, why donít the rest of them?? So, I decided I must not have enough pressure in the LP tanks so went and got them filled. But, full tanks still had the same result.

Now, I am assuming that I have some clog in the line that just happens to affect the furnace, TL hot water, and furnace and not the stove, and am planning on taking off the fitting in each of the non-functional pieces to see whatís going on.

I would LOVE any advice anyone had about what to look for and how to go about troubleshooting. I am trying to do the simplest things first, but would love to have all of those functions back.
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Old 06-22-2019, 02:24 PM   #2
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2007 22' International CCD
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Possibly check for low pressure on the propane regulator first off.

Google for Ďhome made manometerí to find out how to easily make one and check your propane pressure, or have a propane technician check your regulator. Then troubleshoot from there. If you donít have enough (11 inches of water or so) pressure things get very weird...
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Old 06-22-2019, 04:13 PM   #3
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2002 30' Classic S/O
Melbourne Beach , Florida
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In 5 years of Airstreaming with 2001, 2002 trailers I have had three regulators go bad. One was a replacement less than a year old. The furnace and water heater take a lot of gas, the fridge not so much.


Another thing I have noted is liquid in the lines. It smelled awful. I suspect a combination of water delivered in many refills absorbed some of the odorant that is required by law. Disconnect your lines wherever you can and blow them out. 11" WC ia only about 1 psi and may not be enough to get past liquid in a low spot.


Al
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Old 06-22-2019, 04:43 PM   #4
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1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
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On my 1988 model the service tech finally found the line past the regulator collapsed internally. Apparently there is a rubber line past the regulator. Metal lines can crimp and corrode and collect water. He thought it was the regulator and changed that first. He then used a flow meter to diagnose and fix the problem. The furnace starts reliably now.
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Old 06-22-2019, 05:20 PM   #5
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2007 22' International CCD
Corona , California
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On my rig there is a three foot flex hose between the regulator and copper tubing run to the appliances. If itís getting old itís worth replacing it. 12 years of sun exposure made mine very stif and cracked externally. Itís a new one now, along with tank pigtails. If yours are original, Iíd strongly consider replacing all that stuff.
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Old 06-22-2019, 05:22 PM   #6
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1972 31' Sovereign
1975 31' Excella 500
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Benton , Arkansas
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I say it's 99% a failed regulator.

IMHO modern RV regulators are crap, and if the regulator you have is old,,,, well it's old....

The furnace and the water heater require a lot of gas, the stove not so much, the fridge not working part I don't have an answer for.
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Old 06-22-2019, 06:14 PM   #7
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2018 30' Classic
Thousand Oaks , California
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Iíve got a newer model but on our fridge, when it flashed LP it means there is no LP going to the fridge. In our case, it was just because I switched from one tank to another.

Turning it off then back on is how I reset it, never came back on. For some reason, we have to manually reset fridge if propane is cut off from it? Have you tried that before breaking everything apart?
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Old 06-22-2019, 06:40 PM   #8
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Virginia Beach , Virginia
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Quote:
Originally Posted by BigSxyWhtGuy View Post
Iíve got a newer model but on our fridge, when it flashed LP it means there is no LP going to the fridge. In our case, it was just because I switched from one tank to another.

Turning it off then back on is how I reset it, never came back on. For some reason, we have to manually reset fridge if propane is cut off from it? Have you tried that before breaking everything apart?
100% same experience here with 2012 Airstream.
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