If you have the electric hot water heater switch on too, that is a lot of amps. And yes, I ran in to this on my old coach that when the converter detected low DC power from the batteries and switched that on to charge them, that like 13A for that, plus the A/C, plus the Elec. hot water, was too much.
Otherwise, if that isn't your problem, of course look to taking it in to the dealer then, that's why you have the warranty.
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TH : 2016 Stealth WA2916
TV : 2012 Ford F-250 PSD
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