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.
Intermittent "leaks" are usually caused by the relief valve opening.
Does the pipe from the relief valve empty into the pan? If so,
put a cup under the pipe so you will know if the water came from there.
Relief valve opening is most often caused by over-pressure due to
thermal expansion. Here is one explanation:
The drain pan should have its own drain pipe to dump the water
"somewhere". See if it does and it's not clogged.
That larger pipe on the right goes up into the kitchen area so it must
be a pipe to the sink/dishwasher.
How can I get this water heater to drain out from the pan correctly
though? I've looked briefly on the outside of the house for some type
of PVC cleanout but no go so far. I'm not sure where the builders
would have put that. What should I do?
Just shut off power to the heater and open a hot water spigot somewhere to
cool off the tank a little, then shut off the cold water supply to the tank,
just in case the relief valve decides to open while you're working there.
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