I had a similar issue with my Webasto shutting down in the TX cold snap once the temps got below 15°. Just on a hunch put a gallon of diesel conditioner in the tank which was full at 200 gallons and ran the main engine for two hours. It appeared to heat up the fuel, if that was the issue, and when I fired back up the Webasto worked like a charm since. It ran a full week after the shutting down episodes. Didn’t think it was cold enough to cause a gelling issue but the conditioner seemed to work and maybe that fuel line to the Webasto is so thin it was struggling to get enough fuel? I also notice now it appears the Webasto is smoking less now and burning cleaner? Will get in for service now it’s warmer either way.
Kirk & Donna
2006 Country Coach
2022 Ford Bronco