I am sure you have checked the circuit breakers. Do you have 120 vac at the roof unit junction box? Have you checked connections at both ends. I have seen an electrical circuit push a volt meter but break down under a load. Will you be able to troubleshoot a control board with some direction?
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