How to repair a leaking shower mixer valve
If following the steps above hasn’t fixed your leaking showerhead and you have a mixer shower, the flow cartridge could be the issue. Follow these steps to find out how to replace it.
What you’ll need
- A Philipps screwdriver
- An adjustable wrench
- A replacement flow cartridge
1. Turn off the water
Before starting any repairs, find the stop tap or isolation valve and switch off the water supply.
2. Remove the cap
Take off the decorative cover (usually where the hot and cold symbols are), then use the screwdriver to remove the cap from the flow cartridge. Use the adjustable spanner to remove the outer ring, and the cartridge can be unscrewed.
3. Fit the new cartridge
After removing the old cartridge, replace it with a new one, ensuring the three holes are lined up correctly. Hand-tighten the cartridge, then use an adjustable spanner to secure it. Don’t over-tighten the cartridge, as it could damage the thread, causing further leaks.
4. Replace the cap
Screw the cap back into place and replace the cover. Turn the water on to test the showerhead and check for any signs of leaking, including the areas where parts have been replaced.