My hot water heater's drain pan (overflow pan?) has filled up with water. This is not the first time. It has happened before and the water went away after a few days...now it's back. What could be causing this pan to fill up with water and overflow onto the floor in my basement. It's a minor overflow .. meaning.. I throw a few towels down and most of the water is soaked up off the floor. The pan is still holding water as I type.
HELP! ;)