It sounds like you're describing a — a common issue in cold weather where water inside a pipe freezes, blocking flow and potentially causing cracks or backups.
: These "U" shaped pipes under sinks hold a small amount of water to block sewer gases. In uninsulated cabinets or crawlspaces, this standing water is the first to freeze. frozen drain
Allowing faucets connected to vulnerable pipes to drip slightly can help prevent water from freezing, as the flowing water is less likely to freeze. It sounds like you're describing a — a
The best way to deal with a frozen drain is to prevent it from happening in the first place. Allowing faucets connected to vulnerable pipes to drip
Once the water starts flowing, let it run for a few minutes. Check the area around the pipe for any cracks or leaks. If a pipe has burst, turn off your main water shut-off valve immediately and call a plumber.
⚠️ on any drain pipe – risk of fire, steam explosion, or melting.