Some propane appliances will operate with less pressure. I had a propane range that would not operate correctly. Everything else in the RV on propane worked great. I took out the range and took it to the RV shop. It worked great. I put it back in and it wouldn't work. When I took the range back to the RV shop and asked for my money back he took me back and showed me there was nothing wrong With it. Turned out be be a bad regulator on the propane tanks. Dirty propane can destroy a regulator. Once I took the regulator into the shop I saw the problem. Low pressure and not adjustable. I was baffled because everything else on propane worked fine. Any RV dealer should be able to measure the pressure coming out of the regulator and make sure it is correct.