Originally Posted by kaylorsan
The airstream manual does not mention it all all. The Atwood manual (very limited) has a wiring diagram and refers to one of the 'leads' on the light as a lockout. So, armed with the responses received and the wiring diagram, I'm going with the fact that a continued lit light is a problem. A briefly lit light is showing a gas ignition.
I'll search for a more detailed Atwood manual online.
My water heater came with a defective thermostat. I learned first-hand all about that little red light then. Depending on the cause of the lockout, the fix could be as simple as turning off the water heater for a minute, then restarting it. However, if the thermostat is defective as mine was, the problem will just keep coming back and the red light will come on again.
By the way, the only manual you'll find online is identical to the manual that's supposed to come with your Atwood water heater. My Interstate was missing the water heater and LP Gas detector manuals altogether, so I had to go to the Atwood web page and download my own.