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Old 01-01-2016, 02:56 PM   #1
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1975 31' Sovereign
White Rock , British Columbia
Join Date: Nov 2013
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Furnace and hot water heater work individually but one goes out if the other is opera

Hi there, I have a 75 31' excella. Both the Furnace and the hot water heater have been recently serviced and both work great one at a time, but if the Furnace is running the hot water heater appears to be running out of propane and goes out. If the hot water heater is running, the Furnace wont light. The tanks are new and full. The valve is fully open. What should I check next?
Thanks, Darrell
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Old 01-01-2016, 03:17 PM   #2
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2006 23' Safari SE
Biloxi , Mississippi
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Have the flow pressure tested. Your regulator may need adjusted.
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Old 01-01-2016, 03:22 PM   #3
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I think AWCHIEF has nailed it. Simple and inexpensive to fix. With a little reading and using the SEARCH function this could be a "do it yourself" job too.

Paula
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Old 01-01-2016, 06:06 PM   #4
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You might also want to inspect the copper gas line between which ever is nearest the regulator and that device (furnace or HWH).
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Old 01-01-2016, 07:03 PM   #5
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Morrill , Nebraska
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Check the gas line under the tongue. It may be crushed, restricting the flow.
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Old 01-02-2016, 12:07 PM   #6
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1988 25' Excella
Montrose , Colorado
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Furnace/water heater problem

Suggest you borrow a test instrument called manometer (source: plumbers, or purchase at Home Depot). Attach it to any propane outlet that is located after the propane regulator. The pressure should be between 14 and 11. Adjust the regulator if it is adjustable.
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Old 01-02-2016, 03:09 PM   #7
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1996 25' Excella
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Quote:
Originally Posted by coloradopete View Post
Suggest you borrow a test instrument called manometer (source: plumbers, or purchase at Home Depot). Attach it to any propane outlet that is located after the propane regulator. The pressure should be between 14 and 11. Adjust the regulator if it is adjustable.

The pressure should be tested when the gas is flowing to the other appliance. The pressure will always read "full inches of water" if there is no flow. It drops when the flow through the (probable) restriction limits the down stream pressure. The restriction could also be a plugged or faulty regulator or diverter valve at the Tanks.
JCW
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Old 01-04-2016, 09:08 AM   #8
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1976 31' Sovereign
Bowling Green , Ohio
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Furnace or WH, but not both.

I just had the same issue on my 1976 31 Sovereign. I have owned this trailer for 20 years and never had the problem. But all of a sudden I had weak gas at the stove, the furnace cycled a lot and the air it produced was lukewarm at best. The pilot for the WH only stayed on if nothing else was drawing gas.

My first thought was to replaced the 10 year old regulator. Even though my trailer lives inside I thought that it may have gone bad.

I was wrong, and the symptoms remained. The copper was all fine, and the appliances had worked find just a few weeks earlier!

The only thing it could be was the 24" rubber line between the regulator and the copper. It was original, but who knew? I know from experience that rubber brake lines swell over time on the inside, and eventually become so occluded that the brakes work very little and can even lock on because of the trapped pressure.

I cut the old line off of the copper ( the flared fitting was so old it was seized) and cut the hose into sections. At the flared end things were fine, but by the time I got to the crimped ( regulator end) of the hose, the opening had swollen down to 1/8". I ordered a new hose from Vintage Trailer, and when it arrived it looked like a pipeline by comparison. New flared ends on the copper, a quick installation, and I can now bake bread, make popcorn, run the WH, the fridge, the catalytic heater, and the propane lantern AND the furnace and all runs well!

Good luck
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