Shower Faucet: Leaking-M-Core Valve
The most common reason for a leaking shower is the cartridge. The full M-Core line includes two series of valve assemblies, each using a different flow cartridge. See the chart below for troubleshooting help.
Continuous Leaking with the Handle in the Off Position
Water Leaks From HandleWater Leaks Around the Escutcheon/Back Plate
|Water Leaks Behind the Wall||Call us at 1-800-289-6636 or Contact Us|
Showerhead Leaks When Running the Tub Spout Only
This symptom is called Stacking, see article What is a Stacking Leak?
Identify the Valve Series and Cartridge:
2 SERIES- A 2 Series M-Core valve handle rotates only to adjust the water temperature, the system only provides one level of water pressure. The 2 Series uses the 1212 flow cartridge.
- For 2 Series Shower Only, see article 1212 M-Core Cartridge 2 Series: 3 Port Valve
- For 2 Series Tub and Shower, see article 1212 M-Core Cartridge 2 Series: 4 Port Valve
3 SERIES-A 3 Series M-Core valve handle rotates to adjust the water temperature and pushes in and out to adjust the force or volume exiting the showerhead or tub spout. The 3 Series uses the 1213 flow cartridge.
- For 3 Series Shower Only, see article 1213 M-Core Cartridge 3 Series: 3 Port Valve
- For 3 Series Tub and Shower, see article 1213 M-Core Cartridge 3 Series: 4 Port Valve
For additional information on M-Core Shower products, visit Single Handle Shower: M-Core at Solutions.moen.com.
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