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

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I recently had a new Moen Posi Temp shower valve installed. I'm having an intermittent problem now. At various faucet handle positions, the valve will start sputtering and vibrating. The only way to stop it is to move the handle to another position to change the temperature and then move it back to the original position. - I opened up the shower wall from behind and strapped all the pipes down securely and the problem still exists. With the valve exposed I heard a harsh ticking sound in the valve as the water was sputtering. Can someone please help me? It would be much appreciated.

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This problem is in the head of the valve itself. These faucets are complex systems and I have seen many improperly installed. When you pull the cover off (it has an O-ring to create enough friction to keep it in place) you will see a ring with teeth and possibly molded to fit inside the cavity in one of two or four positions. Additionally there are two tiny cups that go behind the head of the shower valve to prevent sputtering . The water must be turned off and lines opened before this is even opened. It sounds to me like one of those little plastic cups is misaligned, possibly leaving just enough space for water under pressure to escape past the wall of the cup, which creates the "sputtering".

Only professionals should attempt to install these, and I have even come behind pros that did not understand how they had to be installed. My recommendation is to call back the installer, have him pull it all out, replace that damaged cup and put it back together.

You should watch him do it, so that you see what was wrong in the installation. Properly installed there is no way this kind of thing happens.

Dan

Posted on May 18, 2009

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No hot water on Moen single handle shower faucet. cold ok and shut off is fine


do you have hot water elsewhere? if not, might be that your water heater is not heating.
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did you have hot water before? is this a new house? new valve?
need a little more detail.
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