Plugged into 120V receptacle........
Is the ON/OFF switch on backside of water heater ON? IF ON is the water HOT?
IF HOT the propane will not fire until water temp cools to below 110*F
The switch by sink with red light is for propane operation.
IS the RED light ON?
IF ON...'fault' has occurred during propane operation. Turn switch OFF then back ON to reset.
You have to have good 12V DC power for propane to fire.
ECO (high temp t-stat) and normal t-stat in outside compartment (180*F/140*F 12V DC)
You only need 120V AC for electric to operate....no 12V DC needed for the electric on your vintage of Atwood.
AC circuit breaker........ON/OFF switch....element if element isn't bad.
ECO (high temp t-stat) and normal t-stat for electric on backside of WH tank by element (180*F/140*F 120V AC)
Water pump has to be ON for water to flow (or connected to a water hose via connection on RV) Switch in bathroom..'pump'
'Heater' switch probably for waste tank heater pads.....they could be 12V DC or 120V AC
