Shower Faucet: Low Flow-M-Core 4 Series Valve
The most common reason for low flow in a shower the cartridge. See the chart below for troubleshooting help.
What type of Shower System do you have? |
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Standard Shower or Tub/Shower
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Vertical Spa using a Transfer Valve
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Mixing Valve: The 4 series is a unique shower system in that it has two handles that are stacked in front of each. 1 Flow Handle: This handle turns the water on and off and controls the volume of water. 2. Temperature Handle: Operating this handle allows you to set your desired water temperature.
Transfer Valve: The M-Core series transfer valve numbers are U231 or U361. 3-Transfer Valve Handle: Rotating this handle activates the individual showering device. Example: Showerhead 4-Shower Device: Example: Showerhead, Handheld Shower |
Which part of my system is causing the problem? |
If you have a Vertical Spa (Multiple Device System) and one of the showering devices is not operating a full flow of water. Confirm all of the other devices are working properly. If they are, see Vertical Spa: Independent Transfer Valves, for additional information, this indicates an issue with the Transfer Valve.
For all other situations and symptoms continue below:
| Symptom | Solution |
|---|---|
Low Flow: Temperature SpecificA reduction in flow when operating one specific temperature. (Ex: Only when using hot water) |
Replace the Thermostatic valve cartridge, see article: 1214 M-Core Cartridge. |
Low Flow: Hot and ColdA overall reduction in flow from a showering device.
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1. Check for blockage in the shower device. The low flow symptom can occur if debris has come through the line and became trapped causing a reduction of flow. Remove the device and turn the water flow on. Is the flow of water normal with the shower device removed?
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No FlowThere is no hot or cold water from the shower system. |
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All Hot or All Cold Water
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The M-Core 4 series utilizes a Thermostatic cartridge. If the system is only providing extreme hot or extreme cold (no mixed water-warm), there are two common causes. New Installation: 1. Cartridge is backwards (hot and cold are on wrong sides). Try flipping cartridge 180* 2. Replace the mixing valve cartridge, see article: 1214 M-Core Cartridge. Existing Installation: Replace the mixing valve cartridge, see article: 1214 M-Core Cartridge. |
For additional information on M-Core Shower products, visit Two Handle Shower: M-Core 4 Series at Solutions.moen.com.
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