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Tell us what it is doing.
If water is running right now, call — do not fill in a form. If it can wait until business hours, the form is fine and you will get a real answer.
Happening right now?
Turn the water off first, then ring.
There are four things worth doing in the next minute — they decide how much damage this does.
Send us the details
The more you can tell us, the better the first answer is. What it is doing, when it started, and whether you have turned anything off.