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The high limit thermostat has not done it job in opening the circuit to the control board and ceasing the operation of the burner. I suggest you have a qualified technician diagnose as to why it is allowed to get so hot and not only replace the bad high limit thermostat (switch) but correct the cause.
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