20 Most Recent Moen 1 Handle Lever Shower Faucet With POSI Valve NI Questions & Answers


You can cap the lines at the tub faucet to rule out tub faucet. It maybe mixing there.

Faucet may be bad also the safety stop will alow you to change water temp it can be tricky to adjust water temp.

Moen 1 Handle... | Answered on Aug 09, 2015


I'm slightly in the dark on this because I have no idea which model moen shower valve do you have? Here's a shot in the dark....single lever anti-scald tub and shower valves, moen brand in fact, prevent scalding by a means of a cog or two, (a cog is a flat metal piece, with an arm sticking out on a 90 degree angle, and has a star shaped cut out in it's center. That star shaped cut out fits perfectly over and on to the center stem of the valve. These cogs are located under the handle. These two cogs are what limit the handle from opening completely counter clockwise. When the handle is at it's most open counter clockwise position....the port that allows hot water to enter the valve and come out of the shower head is at it most open position. Those two cogs are what prevents the hot port from being fully open by means of the 90 degree arms sticking out and under the handle. The handle has two flat surfaced walls that catch on those arms sticking out from those cogs under the handle. You have to position the cogs on the spindle, (valve stem), in a position that will stop the handle short of full counter clockwise to prevent the shower valve from opening enough to allow enough hot water to pass through the port to possibly scald a person while showering. It's a real tricky process setting those cogs to a position so that when your valve stops it's counter clockwise rotation, (which is how the valve it turned on), it stops in a position that only allows enough hot water to flow that mixes to be a nice warm shower water temperature. You see, with the hot water flow limited, there is little chance you will ever be burned by your shower water (thus...anti scald mode is in operation).....
Now here's the kicker.....When soldering the connections on your shower valve, (during the installation process), the installer must remove the cartridge from the valve body to prevent melting it with his torch while soldering the joints. When that cartridge is removed, those two cogs hang loose and slide off the spline. And when they are removed, it is quite a chore to place them back into the position they are intended to be placed in. and..WHEN THE COGS ARE RE-PLACED IN A CERTAIN (WRONG)POSITION, IT FORCES THE HANDLE IN A POSITION THAT IS WRONG, AND WON'T ALLOW THE HANDLE TO REST IN THE OFF POSITION. The cog arms are preventing the handle from rotating to a completely closed position. Which causes exactly what I think you are experiencing. When the main water valve is turned back on....you can't stop the water from flowing through your newly installed shower valve. Those cogs...in the wrong position on the spline....will not allow the handle to spin to the correct point of the off position.
You have to remove your handle, slide the two cogs off of the spline, then re-place the handle on the spline and turn it until the water stops flowing out of the shower head....now pull the handle back off....look at the underside of the handle....you will see a couple of walls within the open underside. those walls are what the arms on the cogs hit to stop the rotation of the handle....Now hold your handle in front of yourself and face the shower valve....now position the lever on the handle straight down....now lean the handle back to view the positions of those two walls on the underside of the handle.....now imagine those two arms on the cogs sticking out in the area between those to walls ....with one arm positioned to stop the handle in the position with the lever straight down....then imagine the other arm sticking out in a position somewhere around 11 o'clock, (if you look at it like a clock), .....so now the first arm is around 6 o'clock and the other at 11.....now slide the handle onto the spline, with the lever down .....then test the valve by turning counter clockwise to turn it on. ....turn it until it is stopped by the cog arm....now feel your water temperature....if it's good...then turn the handle clockwise to the off position....is it all the way off? if not, pull the handle off...adjust the 6 o'clock cog arm back toward the 7 o'clock position, just one spline ....replace the handle and try again.....that should fix the off position....if you need the water a little warmer, move the 11 o'clock cog arm toward the 10 o'clock position a position or two....to get a cooler mix on your water....move the 11 o'clock arm the opposite direction.... WHEN YOU HAVE FINISHED RE-CALIBRATING THE VALVE....SECURE THE HANDLE AND COVER BUTTON BACK IN PLACE AND CALL IT GOOD...IF YOU DIDN'T DROP THE HANDLE SCREW OR ONE OF THE COGS DOWN THE DRAIN......OOPS...SHOULD HAVE MENTIONED TO PLACE A TOWEL OVER THE DRAIN WHEN YOU DIS-ASSEMBLE YOUR SHOWER VALVE...I hope your not corn fused by my lengthy instructions....and I hope you understood the terms "cog"(the two removable metallic pieces that slide on and off the center spline), -"spline"(the metallic stem sticking out of the center of the valve, it has gears all around it) -"handle lever"(the portion of the handle that protrudes outward, away from the center) -"walls on the underside of the handle"(the two flat pieces molded into the underside of the handle that act as stops by not being able to spin past the protruding arms of the cogs)...Good luck my friend and remember to always work safely....

Moen 1 Handle... | Answered on Mar 06, 2015


If your posi-temp valve is working correctly this should not be a problem. Does your hot water temp. ever get extremly hot or just warmer? The way the posi-temp cartridge is designed if you have a large drop jn cold water pressure then the inside piston is supposed to slide to the hot side restricting the flow of hot water to a safe level.If the pressure on the hot side drops suddenly then the valve is supposed to restrict cold water flow.
If the temperature gets to a unsafe level you can adjust maximum hot setting by removing the handle. There is a allen head set screw on the bottom of the handle. Loosen screw and pull handle off. On the newer models pull off chrome sleeve from around valve body and slide outer geared disc off enough to seperate from inner gear. There are markings on disc with arrow pointing to h. or c. Adjust outer disc in the direction you want to adjust and slide it back so that gears engage. Each tooth on gears will change water temp. about2-3 degrees.Try it and readjust till you get the hot set point you want. One other thing you could do is install a small pressure tank on cold water line to compensate for pressure changes. Hope yhis helps you. Thanks

Moen 1 Handle... | Answered on Mar 05, 2015


The shower cartridge needs to be replaced.

Moen 1 Handle... | Answered on Oct 27, 2010


do you have hot water elsewhere? if not, might be that your water heater is not heating.
if you do have hot water elsewhere, did you let the faucet run for a minute or 2.
did you have hot water before? is this a new house? new valve?
need a little more detail.
on posi temp valves, if there were no water coming out of the hot side of the valve, the valve will not operate.

Moen 1 Handle... | Answered on Aug 17, 2010


Rust is usually a sign of galvanized pipe mixed with copper pipe incorrectly.Could be the pipe nipple used for the tub spout connection to the valve.You could change it to a brass nipple might be the problem

Moen 1 Handle... | Answered on Jun 24, 2010


This may sound rather obvious but after the shower faucet was installed did the supply lines get turned back on?

Moen 1 Handle... | Answered on Jun 13, 2010


The cartridge sounds like it was put in 180 degrees out.
Pull it back out, and rotate 180 degrees and re-install & try that.

Moen 1 Handle... | Answered on Jan 22, 2010


Just need to replace the cartridge. It happens....might be fun trying to get that one out though with the way it stopped working.

Moen 1 Handle... | Answered on Oct 18, 2009


First clean out your cabinets under the sink. Second turn turn the cold water valve off, hot water valve as well.
You should be able to locate the sprayer hose as it will have a weight on it, this helps to pull the sprayer back when you are finished with it. Remove the weight by lifting up on the tab should be on the center of the weight.
Then you should see the hose connection.There you should see a button.Push it in and give it a little tug. The hose should be disconnected. Just follow in reverse order to reinstall.
I hope this is information is helpful. Have a blessed day.

Moen Plumbing | Answered on Nov 06, 2019


Turn supply valves off, turn on tub valves to release pressure, then remove the handle on faulty valve. Check to see if it has a plastic cartridge. If so, it sounds like the rib was broken on the valve and it is out of alignment with ports in valve body. Take the cartridge out and take to your favorite home supply for a replacement. The cartridges have a key rib that fits into a slot so turning the handle turns the stem and not the whole cartridge. You might also find a black washer and spring under cartridge, it's a good idea to replace washer whenever cartridge is replaced also found at home supply

Moen Plumbing | Answered on Sep 01, 2019

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