Also verify the propane pigtail(s) aren't defective. They have a high flow shut off valve in them also and I had to replace both of mine a month or so ago. They must have a time clock in them because they both died at almost exactly the same time. They would not allow propane to flow. Two replacements were installed and all is back to normal.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof