The answer to 'drain trap not working' is that a clogged or malfunctioning drain trap is a common plumbing issue that can cause water to back up or drain slowly. The drain trap is the curved pipe section under a sink, tub, or floor drain that is designed to hold water and prevent sewer gases from entering the home.
Common causes include debris buildup, a dried-out trap, or a broken or improperly installed trap. Symptoms include water not draining properly, foul odors, or gurgling sounds. Solutions may involve clearing the trap, replacing a dried-out trap seal, or adjusting or replacing the trap itself. While some basic drain trap issues can be DIY-fixed, more complex problems may require a professional plumber to diagnose and repair the issue.