Verify that you do have good dc and ac voltage feeding the control board. Check for ac voltage out to the heating element in the AC mode (Auto with power to coach). If you have power coming in but none going out then you have a bad control board it all connections are clean and tight.
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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
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