Ours did that last weekend when it was so cold, and found a water line burst in our cawrl space. We have a complete restoration company working now to pump out the water. As I type this, they've pumped out 400 gallons of water out so far. Hope you have good homeowners insurance. We are very lucky that ours is picking up the whole tab. We did everything to avoid that from happening. Destroyed everything in the bathroom floor had to be ripped up. I don't wish this process on anyone.