Looks like I joined the CE error club too ..... oddly the CE code has been on for some time and still worked fine(iaqualink controls heater), but now nothing after not using for a while and getting propane tank filled.
Took side panel off, everything looks fine visually, verified power coming from 2 wires off iaqualink. Any other new tricks? not looking forward to $400-$500 for both of the boards.
but based on the manual page 33.... replacing the boards is the fix.