The answer to 'supply line overflowing' is that a supply line overflow is typically caused by a blockage or clog in the water supply line. Symptoms may include water spilling out of the supply line, a sudden increase in water pressure, or a dripping or leaking sound. Common solutions include shutting off the water supply, clearing the clog, and potentially replacing the supply line if it is damaged.
If the supply line overflow is a minor issue, it may be possible to resolve it through DIY troubleshooting and repairs. However, if the problem is more complex or you are not comfortable working with plumbing systems, it is best to call a professional plumber to diagnose and fix the issue.