I have a Atwood 10 gallon electric/ propane water heater on the Hornet travel trailer I purchased used. There are two switches on the wall, one is an on/off switch that lights up and the oither is just an on/off switch. The switch that lights up goes on and off and the water heater does not seems to work. Could you advise ? thank you

The two switches control the water heater either in the gas or electric mode. The switch with the lights would be for the gas operation, and the switch without lights would be for the electric mode. Prior to operating either switch, make sure the water tank is full of water. Turn your hot water tap on, if water comes out, tank is full. Connect trailer to 110 Volt source, turn circuit breakers on, Place switch without lights to on position. If water does not heat in 45 minutes, Install new heat proble. The gas mode should be repaired by someone that is familiar with that system. Atwood can provide you with a local service center.