I thought, I better put the fan heater in the van, first time with a fan heater, had tube heater before that.
So I turned the thermostat down all the way to the frost setting, but turned it too far down, which apparently means that it's just off. Checked this morning and found out. I had a blanket on my 4040, but saw a little bit of ice in the prefilters, and hosereel and everything is frozen.
I hope this isn't a costly mistake and the 4040 isn't frozen. I think it was -4c here.
I put it on now, hopefully it will thaw the ice. Worst of all, only had a tiny bit of water in the tank, which is probably frozen now. Although saying that, the backpack wasn't frozen, so it might not be too bad. I think I might have just gotten away with it. Phew.