Reduced hot water flow in Moen single push/pull knob tub & shower

Discussion in 'Shower & Bathtub Forum & Blog' started by Rebecca Huss, Jun 2, 2021.

  1. Rebecca Huss

    Rebecca Huss New Member

    Joined:
    Jun 2, 2021
    Location:
    Texas
    Hello,

    Hoping someone can lend some advice.

    We just bought an older house - built in 1975. There is a single handle push/pull Moen tub/shower combo in the master bath. The sink (which is close to the plumbing for the shower, runs beautifully).

    When the knob is turned to the hot water side, the hot water pressure reduces to almost a trickle. It is both the tub spout and the shower head. This has come and gone twice since we moved in.

    The valve for the shower is not on the faucet head. It is below the handle. I've never seen one like it before, but it is in both bathrooms of the house, so I assume it is normal.

    Before I begin... we have experience with this type of shower and the first thing we did was shut off the water, pull the cartridge, turned the water back on to blast out any sediment, and then subsequently replaced the cartridge with a brand new one. Things were a better after that - for about 2 weeks. Now, we are back to almost a trickle. To my knowledge, almost nothing came out when we blasted it out - unless it was something invisible.

    We are stumped and hoping we can fix it ourselves. I doubt it's anything to do with the hot water heater, since we have perfect hot water flow to every other faucet in the house.



    Appreciate the help!
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    What decade was the home built? Does it have galvanized pipes? Those can close up over time, especially on the hot side.
    Or it could be the cartridge again. Or I have also seen a small plastic ball on the hot inlet, a part of a heat trap for a water heater. Only once though.

    [​IMG]
     
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  4. nebojsa

    nebojsa New Member

    Joined:
    Sep 2, 2020
    Location:
    ontario
    "small plastic ball on the hot inlet" what is it and where is it
     
  5. nebojsa

    nebojsa New Member

    Joined:
    Sep 2, 2020
    Location:
    ontario
    Never mind, the answer is in front of me.
     
    Jeff H Young likes this.
  6. Jeff H Young

    Jeff H Young In the Trades

    Joined:
    Feb 27, 2020
    Location:
    92346
    glad answer was right in front of you. What was it ? plastic ball wedged in port of valve body? It could help others in similar situation
     
  7. Rebecca Huss

    Rebecca Huss New Member

    Joined:
    Jun 2, 2021
    Location:
    Texas
    The pipes attached the the shower valve are copper as far as I can see.

    The house was built in 1975. The assembly is like the one pictured above, except it is a push pin diverter to switch between the tub spout and the shower head.
     
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