what are the reasons for sticking low oil float switch?
I can't find any model from Frymaster with your numbers. But assuming it is a fryer, check the oil spec vs. Wellbuilts spec for the machine. It may be congealing from glycerine or other impurities. Optionally they may be running the oil to long or to high a temp.
I did find this in a CV manual; This is a weekly item.
I'm with @fixbear on this, the only thing that makes sense is it needs to be cleaned better, the float itself could be new but if the spot where it goes is dirty, it will stick. Think carburetor in small engines.
Think about where the float is. At the top of the oil with all the floaties the stick to everything. It's a item just asking for problems.
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