If you have a dual power (Gas/AC) water heater you must make sure the AC power switch (or breaker) is off before applying power to your camper.
The AC heating element will burn up immediately should power be applied without water in the tank. If you are unsure, briefly open the pressure relief valve behind the outside metal grill. Water should come out under pressure.
Be careful because if the water heater has been running the water will be hot!
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