Flooded basement due to frozen evaporator coil? We had the annual service call on our central air unit today and the subcool charge registered at '1' which, even to my completely ignorant homeowner ears seems like a low level.

He told me if we continue to run the A/C this year at all there is a chance the coil will freeze and, if that happens, thawing the coil would flood our entire basement. Seriously, that's what he said, the entire basement. 

Looking for confirmation on that last point there. I mean, if the coil freezes and then thaws, it's going to thaw into the utility room and we can expect some water so couldn't we, like, plan for a way to ensure the water makes it into the sump pit that's 3' away? Would there really be enough water from the thawing coil to flood the basement? 

Ideally, we won't have to worry about this but flooding the basement would be a very, very expensive mistake. 

TL:DR - Will thawing a frozen coil result in a flooded basement? 