Got it, thanks! My Aqua-Hot model doesn't have that board therefore I didn't think about a control board versus the control box.
I have the 431/12 model which replaced my older failed AHE-100-02S unit.
Dr4Film ----- Richard
2002 Monaco Windsor PBT 40Ft. (R HOME) - 30Ft. 2006 Pace Trailer (R JUNK). Trailer Has 06 VUE (R TOWD) 04 Victory Alen Ness Edition (R RYDE). Full-Timer for 14 Yr's BUT now a Part-Timer. Cummins ISC-350 With Banks Power Pack and Upgraded PRXB PacBrake.
We are at our Winter Home in Flagler Beach FL