I don't have a Truma, but the same thing happens when I use the electric heating element in my air conditioner. I think it is just dust and stuff burning off the heating elements. I bet it will go away after awhile
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Now: 2022 Fully-custom buildout (Ford Transit EcoBoost AWD)
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
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