Mu unit is 8 yrs old this month. First problem with W/H. Atwood Gas Elec w/Elec Start. No trouble shooting info with instruction manual. Wall switches light up for gas and elec but no hot water. Breaker is engaged. Couldn't isolate a fuse in fuse panel. Had wife engaged switch for gas while I was at the heater, no clicking and no gas smell. Tried it more than once. Any help/advice will be greatly appreciated.