Question about Moen Posi-Temp Single HandleTub And Shower Faucet

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I installed a moen posi temp faucet, but it never had good hot water flow. If I remove the cartridge and turn on the hot water then I have plenty of hot water shooting out. The cold water comes out fine. I replaced the cartridge with a new one and nothing has changed. Any solution?

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In most cases, the knob has been installed upside down. To correct this simply:

  1. Remove handle cap and the Phillips screw under the cap.
  2. Pull the handle off the faucet.
  3. Now replace the handle, only this time, make sure the point of the waterdrop handle is pointing downward to the six o'clock position.
  4. Replace the Phillips head screw and handle cap.
The next reason could be' It is possible that the balancing spool is stuck due to non-use. Replace the cartridge to correct this situation. To prevent future issues, use the faucet at least once a week.

You could try gently tapping the valve and run in under hot water in a sink and see if any deposits come out. It could be from hard water, rust, minerals etc.

I had a problem with one before and contacted Moen and they sent me a new valve for free
Call: 1-800-Buy-Moen (1-800-289-6636)
Or you can email them at the link below.
http://www.moen.com/consumer-support/contact-us

I believe this should answer your question, Thanks for using FixYa

Posted on May 22, 2011

  • Carl W May 22, 2011

    If you just installed it recently there could have been debris in the pipes when you connected it. Did you flush out the lines before putting in the cartridge, if not a small piece of deris could be keeping the positemp valve from working properly. Hope all this information helped you with the problem.Thanks again for using FixYa

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1 Answer

Moen single lever shower handle gives only hot water


A bit more information is needed; is this a Moentrol or a Posi-temp valve? You will need to shut water down to the shower. If it is a Moentrol, it could be an issue with either the cartridge or the pressure balancing spool. If you are at least getting water, I am going to assume that it is a Moentrol.
You will need to turn water off to the valve. Pull the cartridge and examine as to whether or not debris is blocking the supply holes of the cartridge. If your valve has built in shut off screws, you can slowly turn water on to clear any debris that may be inside the inlet port. I typically use a piece of PVC to go over the valve body so that water does not leak between the wall and the shower. Again, just turn water on enough to start it flowing.
If you do not notice anything amiss with the cartridge, it could also be the pressure balancing spool. If that is on your valve, it will be a flat head screw about the size of a nickel. Water will need to be off for the removal of the spool as well. Again, you will be looking for debris that is blocking water flow.
If this is an older Moen faucet, you may just want to replace the cartridge while you have it removed. If it is a push/pull, it is a Moentrol. If you have to turn the handle for water to come out, it is a Posi-temp. In my area, the cartridges run from $20-$40. However, Moen does offer lifetime on their cartridges. Lately, I have had a few more hoops to jump through to get the replacement cartridges from Moen, but they are still very pleasant to deal with.

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1 Answer

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no one ever really figured out why this happens, but you can purchase a "hammer arrestor" to solve this problem. they work good and believe it or not they are best installed at shower valve. good luck

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