Since the control panel seems to show you have an activated water heater circuit, I'd guess there is a pretty good chance it was turned on with an empty tank, which usually results in a burned out heating element.
A pic of the water heater would help, or a model number. It could be a relay or a couple of other issues, but the burned element is likely (assuming that it has electric, which I do based on the vintage and other upgrades present in the image of the panel).
2011 PrimeTime Tracer 2600rls
2001 GMC Yukon XL 2500, 6.0L 4.10:1 axle ratio
Nights camping 2014 - 17
2013 - 15