I came home from doing a double and find my tank 5mm away from flooding my rented room. Looking to see what was causing it I noticed the u-tube on my overflow had a lot of air in it. (See below).
I work a lot and don't always come home. I'm afraid to come home to a wet floor. Again, I'm only renting a room and it would be embarrassing and expensive if I did! Please help! I have the next two days off and need this to be resolved.