Do you have 30 amp or 50 amp service tot he coach. If 30 amp, you may have another selector switch for which air cond. will operate. Please include the year, make and model of your coach with as much information about the problem (what you have checked and found). Thank you.
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