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If both switches (inside and out) are on and the tank is not empty you could have a bad shut off valve. Check the Battery Control Center usually in the power cord compartment for fuse. If it is not blown you will have to access the tank in-between the frame rails and check for voltage and valve condition. Use extreme care if you feel you are qualified to service the LP system itself. Let us know what you find.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7