Assume you're talking Truma, not Truman?
I have the Aquago Comfort Plus unit and during normal operation just stay on the 1 o'clock, 2 o'clock, 3 o'clock positions, and you'll be fine. They are ECO (ON), Comfort (ON), and OFF respectively.
No need for flashlights and glasses.
We usually just leave ours on "ECO" mode when traveling. Don't forget the 3-way rocker power switch "on" on the unit itself. And the propane "on".
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2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)
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