I forget who told me to take the cover off for a bit every day or longer if going for more days without the cover off .

Something about gas lock , anyone join in and correct me . But it seems if the pool doesn't breath a bit from time to time , the gases lockup and it won't let your FC work like it should .

Sooo even if it's cold out I try and get the cover off for a 2 hours or so every other day .

Hope this helps ya and gl .