1 Prepare safe work
Close the main or local valve, open the lowest faucet to relieve the pressure, and protect the floor with a bucket and cloths. If there is electricity nearby, switch off the appropriate breaker.
⚠ Warning: Do not work on a pipe under pressure or on a water heater connected to electricity. Hidden leaks, a damaged main line, or repeated wetting of the wall require a plumber.
2 Determine the condition and cause
Close the valves under the faucet, remove the decorative cap, and mark the position of the handle before carefully loosening the retaining screw.
3 Carry out the key check
Check whether there is limescale around the handle and cartridge. Do not lubricate the inside with universal oil because it can damage the seals and contaminate the drinking water.
4 Do the repair or maintenance
Clean the accessible deposits or replace the cartridge with an identical size, refit the handle, and check the mixing of hot and cold water.
? Tip: Photograph the initial state and change only one thing at a time. That way you’ll more easily figure out what actually solved the problem.
5 Test the result
Slowly open the water and watch every joint for at least a few minutes, first without load and then at full flow. A damp trace, pressure drop, or sewage smell means the joint needs to be inspected again.