⚠ 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 Prepare for safe work
Close the main or local valve, open the lowest faucet to release the pressure, and protect the floor with a bucket and cloths. If electricity is nearby, turn off the corresponding fuse.
⚠ Warning: Do not work on a pipe under pressure or on a boiler connected to electricity. A hidden leak, a damaged main line, and repeated wetting of the wall require a plumber.
2 Determine the condition and the cause
Close the main valve and confirm that water no longer flows. Disconnect the flexible hose and counter-hold the installation with another wrench.
3 Perform the key check
Unscrew the old valve without twisting the pipe, clean the thread, and check for cracks or corrosion at the wall connection.
4 Perform the repair or maintenance
Apply sealing material suitable for the thread, screw the valve into the correct position without turning it back, and test under pressure.
? Tip: Photograph the initial state and change only one thing at a time. This will make it easier to determine what really solved the problem.
5 Test the result
Slowly turn on the water and observe each joint for at least a few minutes, first without load and then at full flow. A wet trace, a drop in pressure, or a sewer smell means that the joint needs to be inspected again.