Question about Moen & Posi-Temp Single Handle Shower Or Tub Valve

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Replaced a moen cartidge and now the water is not hot in shower

I pulled the old moen cartridge from the shower because I had a water leak. The new cartridge fixed that problem but now the water will not get hot enough for a shower and the water preasure is down. I checked the water stop to make sure it goes all the way to Hot and it does.

Any Ideas

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  • heatguy May 11, 2010

    is the water pressure low throughtout house or bath or just shower fitting.if just shower you may have some debri in line that is clogging hot side you may have cartridge in wrong way and have to turn it 180* or you may have valve not open 100%

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Make sure when you turn on the hot and cold shut off valves all the way and turn the moen on after that. Some times I would get that problem if I turned one(either hot or cold) off then tried the shower.

Posted on Feb 26, 2009

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When i turn it on it is only warm at best. when i turn it all the way hot the water comes out in a trickle. all our other showers and sinks get hot water just fine. this is a single handle shower and does...


You will need to remove the old cartridge from inside the shower valve body and either refurbish it with new rubber seals and O rings or replace the cartridge altogether (preferable). It's not a complicated fix but the Posi Temp cartridge can be a bear to remove. Moen and Danco make special 'pullers' to make the cartridge removal go a little easier (sold at Lowes/HD and plumbing supply for anywhere between $15 and $35 but well worth it, IMO).

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Once you have removed the U shaped cotter pin whis is brass in colour. Use a pair of plyers and hold on to the brass stem. you will need to pull fairly hard to remove. If you have the white or black stem loosening knob which comes with the replacement cartridge you can insert that into the brass cartridge where the plastic sides of the cartridge are showing. Turn your plastic konb clockwise to loosen the cartridge and then pull out.

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The moen began to leak over time now i cant turn the water for


Call moen and give them your model no. they will send you a new cartridge free of charge. if you can't wait local stores like lowes will have them. Turn off your main water shut off valve and take off handle, then with some pliers take off brass ring, the cartridge will pull out. First notice the notch it rests in and notice where the hot water adjustment disc is. Assemble the new one the same way, put some vasolene on orings and reassemble. hope this helps.

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My Mo's shower is about 6 years old. I think the


Sure - there is always help at FixYa!

This sounds like a bad cartridge. They can be replaced. To replace the cartridge:

Turn off the water to the tub/shower.
Remove the handle cover (it should pop off)
Remove the center screw (usually phillips head)
Remove the retaining clip holding cartridge in - you can use a pair of long nose piers or a small screwdriver
Grab the cartridge with a pair of pliers and pull straight out. It may require a little force - there are O-rings around the cartridge to keep it from leaking.
Check the cartridge bore (the hole where the cartridge was removed)
Clean any debris or scale - lime away or CLR will work
Apply a little bit of soap around the new cartridge to help it slide in easier. Push it all the way in and make sure it is seated. Re-install the clip (you should have received a new clip with the replacement cartridge)
Turn the water back on a check for leaks
If OK, reinstall the knob screw, and cap.

Let Mom take her warm shower...:)

Dec 13, 2009 | Moen & Posi-Temp Single Handle Shower Or...

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Try replacing the cartridge first.That's your best bit . Next would be the whole valve. Hopefully, it's just the cartridge.

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1 Answer

Moen shower/tub faucet


hi... yes that's a very common issue with moen "cartridges" -- it's very simple to fix..... grasp the handle and give it a gentle tug upwards when the water is on... if it retracts again, pull the handle out again and tug again but this time a bit harder. Not sure what causes this on new cartridges but it will fix your issue.

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