I have a 2013 Passport 3220bh with the same control panel. I asked my dealer the same question and he stated that you will only see the light glow when there is a problem with the water heater.
The only time I have had the light come on was when I ran out of LP. I probably could have switched to electric only but didn't. After filling up my propane tanks, the light went out as wh kicked back on.
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