Originally Posted by Jjdavidjr
On my 2014 Swift 248rbs, I flip the switches for hot water electric and hot water lpg, and nothing happens. The switches turn and stay red. The Atwood manual states "a red lockout lamp will illuminate" if there is no ignition. I don't know where that is, or what to try next. Gas, 120v electric are on.
This is a different issue than OP is trying to solve IMO.
OP's issue likely has something to do with the ignition not firing for one reason or another. It could be the board, it could simply be the distance between the contacts on the ignition itself, it could be a loose wire, could even be a 12V system problem....
Jjdavidjr's issue may not even be an issue. If the light for gas is illuminated, and the light for electric is illuminated, this would indicate "normal" operation. It takes a little time for hot water to present at the faucet unless you're talking about a tankless system. If both electric and gas are on and functioning, I think it takes about 10 minutes to heat the 6-gallons of water in that tank; a little longer for a 10 gallon tank.
If you're running it on gas and the gas function is not working for some reason, you will see a third little red light in the vicinity of the electric light and gas light on your panel often labeled "FLT". This means there was a "fault" when trying to ignite the propane, and the control board in the WH has stopped trying to ignite, and stopped the flow of gas. You need to cycle the switch and try again. This condition is often caused because there is no propane in the line leading up to the WH (the lines need to be "bled"). You need to make sure your tank valves are open (turn them slowly) and then try to ignite the stove. Once you ignite the stove, let it run for a minute, turn it off, then try to ignite the water heater on gas again.
It helps to have someone listen outside the water heater. After you flip the switch to call for gas heating (assuming the water is not already up to heat), you should hear the ignition clicking, then when the gas ignites, it will sound like a very small rocket engine. If there is no gas for some reason, the ignition will click for a second, stop, click again for a second, stop, click again. After three attempts with no ignition, the board will enter "FLT" (Fault) mode and you will need to cycle the switch to try again.