The Norcold N641 instructions state than the frig may not operate on propane above 4,000 ft. Norcold recommends starting the generator and operating the frig on electricity if you need to keep the frig cold. The problem is not the propane pressure but the lack of oxygen in the atmosphere for fixed orifice devices and the relative increase in propane pressure as compared to sea level air pressure. Adding more propane will make the problem worse.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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