You may not be getting power through the board on the ref. or the heating element may be bad. If you are comfortable with electricity you can check to see if the heating element is getting 120 volts. The heater has two wires that come from above the burner area over to the board. If you do have power going to the element and it does not get hot, it is bad.
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