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Are you talking about the regulator in the propane tank bay or some other regulator in line to the furnace?
Good info to know if and when we run into the same problem.
Not sure if this will help but had a similar problem recently during our stay in MI over the Thanksgiving holiday. Temps got down into the teens overnight. The furnace stopped working so I figured the propane tank was empty. Went out to check, gauge was still showing green. Switched over to the second tank and furnace fired up. The tank I switched from had a frost line about 14" up which surprised me. Had the tank filled and it took 7.5 gallons which also surprised me.
I figured cold temps lowered the pressure in the tank and gas would not flow out. Funny things happen when your on the road in cold temps.
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