I have been in my new home 6 years. I have had to replace the RP10904
Cartridge assembly in the valve 5 times. It is in the master bath. It
will last about 6-8 months and then start making a knocking noise when
ever the water is turned off anywhere else in the house. It will
continue to get worse and is very annoying. It is trash getting in the
lower assembly in the spool piece that controls the pressure balance
per Delta. I have disassembled a couple used ones and could find
nothing. Delta will not say if it is ok to remove the spool but they
recommend not to. I keep the water temp at 105 deg so scalding is not
an issue. Anyone ever remove the spool piece to correct this problem?
If so could you tell any difference in the valve operation? Thanks
Try this. Turn off the water heater. Turn off the water at the main.
Open the lowest faucet in the house (outside tap maybe) Open the highest
tap. Let things drain out (you done need to drain the water heater. When
it stops draining, turn the water back on and close off the faucets. Turn
each faucet on slowly to remove air from the lines. That may take care of
it. Hint: I am thinking the problem is not the valve, but rather a
saturated anti-hammer device.
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