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Question DetailsAsked on 4/12/2016

when my kitchen faucet is on my shower leaks like its turned on, how can i fix this

When Turing on the kitchen faucet to hot water my shower pours like someone turned it on as well. If I turn on the water in my upstarts bathroom tub my first floor shower pours as if it was turned on as well. This problem is getting worse. How can I fix this problem.

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1 Answer


Here is a link to similar previous question with answer -

I would guess you have cartridge type showewr/tub faucet - some of them do this if the water pressure in the household system is too high or low or surges. Plumber would have to investigate to try to figure out what the problem is - could also be older cartridges and O-rings leaking when the pressure changes, or older corroded or weakened springs in the valve.

Also with some cartridge and self-regulating shower faucets - if a tub/shower combo and you do not drain out the shower head after use (opening tab/lever/pull knob so water ion shower riser drains out the tub spout) that pressure can backpressure the shower valve so when there is a change in pipe pressure it lets some water through. Shower-only this is more common because you cannot drain that water down. Moen and Koehler (especially box-store cheapo models) I have heard this complaint on - not Delta that I have heard, except Delta's will do this when there is a pressure surge from shutting off a faucet elsewhere if their springs have gone bad.

Probably replacing the guts of the shower valve (or entire unit if corroded up inside) is likely going to be the fix - typically $150-250 range (parts and labor) to change out the guts depending on brand and on whether self-regulating constant temperature type or not - more like $250-600 to change out the entire valve IF replaceable from the front - can be more if have to access from underlying ceiling or through a wall or back-to-back shower.

Answered 4 years ago by LCD

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