Originally Posted by Flybob
12V is required to control the WH so also check the DC voltage. If it is too low, it will not operate ( safety feature)
My apologies; just when you think you have it all figured out, they come out with a model that changes everything.
IF the OP has a Suburban Model SW6DEL (it has a panel inside the camper that has switches for AC and Gas Water Heater), there is a need for solid 12 volt DC power to make the AC side work. The AC Switch actually is 12 volt DC that closes a relay to route 120 Volt AC to the AC side of the water heater.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW