And check all breakers on the converter, and make sure all the GFCI outlets aren't tripped.
Our pod is in the shop right now due to fridge issues. Gas and DC modes won't maintain temp - it gets almost as warm as ambient. Have had occasional issues with the AC mode too. Of course all of this happened on day 2 of our big trip last year. I cleaned the flue, and since it will work on AC mode I don't think there is any physical problem. My bet is a bad control board, the last few years we've occasionally heard it cycling a relay in there which didn't sound right. Of course it wouldn't do it while it was at the dealer last year.