⚠ Safety note: This guide involves working with plumbing. If you're not completely sure about every step, stop and call a licensed professional. Before you start, always switch off the power at the breaker or close the main water/gas valve.
1 Set up safe working conditions
Close the main or local valve, open the lowest faucet to relieve pressure, and protect the floor with a bucket and towels. If there’s electricity nearby, switch off the appropriate breaker.
⚠ Warning: Don’t work on pressurized pipes or a boiler connected to electricity. Hidden leaks, a damaged main line, and repeated wall seepage require a plumber.
2 Determine the condition and cause
Dry the cabinet and wrap each joint separately with a piece of dry paper. Turn on the faucet, fill the sink, and drain it.
3 Perform the key inspection
Wet paper shows whether water is coming from the supply hose, drain, overflow, or sink edge. Check one area at a time.
4 Perform the repair or maintenance
Tighten a loose nut slightly or replace a warped seal. A cracked trap, hose, or corroded valve needs replacement.
? Tip: Take a photo of the initial condition and change only one thing at a time. That way you’ll find it easier to figure out what actually fixed the problem.
5 Test the result
Slowly turn on the water and watch each joint for at least several minutes, first without load and then at full flow. A damp spot, pressure drop, or sewer smell means that joint needs to be checked again.