I was cleaning one of my vacation rentals. I turned on the MOEN shower
water control. In the middle range, where the warm water would be, there
came a pulsing sound that sounded very regular and harmonic. If you turned
it to hotter or colder, it went away, but if you approached middle again, it
would start, and make an audible sound whoomp whoomp whoomp. The water also
varied in strength, and spurted slightly with the harmonic waves.
Any ideas of what is causing this or how to cure it? Install water hammers?
Which model is it? Pos-i-temp? or ioDigital? or?
Does it just control temp or temp & flow?
How is the water pressure at the house? Too high or too low might
give the valve issues.
Sounds like the unit is "hunting" / "oscillating" about the set
I would try (if possible) throttling back the hot or cold water supply
to the shower valve.
This will give the shower valve a different input condition and
perhaps the change will be enough to get the vibe to stop.
How old is the unit? If its in a vacation home, it probably has pretty
Moen has good customer service & the warranties are decent too.
I would suggest called or emailing.
I wouldn't be surprised if it's something as simple as a valve seal
screw loosening. The seal creeps under the screw compression, and
eliminates the tension on the screw, allowing it to back out, and
loose components start fluttering.
Then again, it may be something completely unrelated. I haven't seen
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.