So, FYI, I have been using the Dometic diagnostic manual to conduct my test. I read it again today and this is what it states for the AC mode:
Test upper control board and harness between upper and lower before testing lower for proper AC operation. Check that incoming AC voltage is present at terminals J5 (black) and J6 (white) on the circuit board. With unit on
AC operation, check for voltage at the heating element connection terminals J7 and J8 on the circuit board. If no voltage is present, check the 5 amp AC, 3 amp DC fuses, wiring harness and upper control. If AC volts are present at J5 and J6 and no voltage on J7 and J8 the AC voltage detection circuit is damaged and the control board will need to be changed.
J5 and J6 had the correct voltage but nothing on J7 and J8 when the unit is on AUTO. I cannot get the control board to be on AC only since I only have AUTO and LP. How do I force the unit to be in AC mode only?
Again, this occurs with a refurbished board that I changed after I suspected the original board was faulty.
Additionally, it just occurred to me that I forgot to mentioned that I replaced the board with a slightly different board: Dometic (3316348.900) Power Module Board which only has a 5amp fuse instead of 3amp and 5amp fuses on my original board. I was told by the vendor on amazon that this was the correct replacement board for my model.
Could this be the issue?
