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 moen shower
Author: bergrey (FL)

I recently changed a moen shower cartridge and now whenever i shut off the water in any room there is a knocking sound. It was never there before. what could I have done to make this happen? Thanks.

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 Re: moen shower
Author: hj (AZ)

I assume it is a pressure balanced valve and balancing spool is malfunctioning. If so, and it is a Moentrol valve, you need a new balancer. IF it is a 1222 cartridge you may need to exchange it.

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 Re: moen shower
Author: bergrey (FL)

yes the valve is a positemp. The plumber put in 3 different cartridges to see if it was the cartridge but the knocking still occurred.

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 Re: moen shower
Author: hj (AZ)

Were they oem MOEN cartridges or third party ones?

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 Re: moen shower
Author: bergrey (FL)

the first one put in was not moen. plumber put in another non moen and same problem with knocking. then he said he put in a moen (i can't verify, didn't see the package) and the same problem exists.

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