Don't know if there is one but AC CB good.  Anyone have LP good, AC bad condition for Atwood water heater?  No heater fuse in BCC or chassis fuse box.

My Atwood water heater operates on LP, doesn't on AC.  Replaced all exterior components, i.e. Thermostat, ECO, control board, etc.  Schematic shows a fuse but I haven't located it.  Heater model GC10A-4E.