If all else fails, call the propane expert, call
www.christianrepair.com for a propane-911 service call .... what you should have done in the first place.
Plumbing & cHeating; what happens when you call the plumber to fix a heating problem. You get cHeated. What you want is a heating technician. The plumbers don't call it 'Plumbing and cHeating' for nothing.