
I think it was last friday when it happened, it was the coldest night, and I think it went down to -5.
I just put my new fan heater in the van, and didn't realise that the minimum frost setting is either way too low, or off. I had a thick blanket on my 4040, but saw the next morning the prefilters were frozen.
Yesterday I started to fill the tank, saw that the TDS out of the membrane was 69ppm (in ~235ppm), I thought, lets hope it's the prefilters, but it wasn't. I changed the prefilters and the actual TDS started slowly creeping up, it's around 73ppm now.
So there you have it. I can't stress enough how important it is to keep it frost free. One mistake and it could set you back £200 or more.
