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I Have 25 year old Grohe two handle shower-only faucet, with very low flow from both valves. What could cause this? What parts might I need? Any tips on repair procedure? Many thanks!

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Have you tried simply cleaning out the aerator?

Unscrew the aerator from the bottom of the faucet and clean out all of the debris on the screen and inside the fitting, then replace.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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Grotherm 800 bath shower mixer just fitted with pumped feed but not giving any pressure


Hello Mark Bentley,

In California... (MY OPINION... every bit)

It is called "social engineering".

FOR More than 25 years... before "the drought)
and without public knowledge MY state mandated
water flow restriction at the VALVES

Although the shower VALVES... were MAUFACTURED
prepared for 1/2 inch PIPE FITTINGS... FINAL
MACHINING severely reduced the holes through
the side of a typical body... were smaller than the
EASILY altered WATER RESRICTERS IN EVERY
shower-head & faucet NOW sold in CALIFORNIA...

Back then... That was 1½ or 2½ GPM
water restriction... (I don't remember which).
It was part of the VALVES CONTRUCTION...

I am PRETTY SURE you are going to have to call
GROHE and find out if there is ANYTHING they
can recommend... now that your VALVES
are installed & finished over... What can increase the
allowed water FLOW...

Only a traveling DENTIST would have the tool
to work from the INSIDE of the valve...

Just my opinion...

Carnac the Magnificent

Jun 13, 2017 | Home

1 Answer

After turning water on to 10 year old grohe shower faucet pressure rapidly drops to nearly nothing


If you spin the shower head off there should be a metal screen inside. If it is clear, Soak the shower head in CLR for about 4 hours. After 10 years even the best water supply will leave behind a build up that can plug the tiny holes.

Feb 24, 2011 | Grohe Grohmix Thermostat Valve & Trim -...

1 Answer

Getting hot water when shower valve is first opened.


If I understand correctly, you have single handled shower faucet.
Normally there is a wait for hot water to arrive at faucet.
But now hot water is already at shower faucet.

Single handled faucets have a mixing area inside valve where hot and cold come together before going into sink.
This mixing valve can have crossover where the hot and cold can pass through to each other even when faucet handle is off. When single handle faucets get old, this can happen.
How it happens:
For example another faucet is turned on inside house, and pressure differential between hot and cold causes hot water at shower handle to pass through mixing area and into cold water line.
So if another faucet has been run, then that lets hot flow to faulty single handled shower faucet.
To confirm this is the problem: turn on other faucet and put ear against shower faucet to listen for moving water.
This condition may also signal there is a water leak.
The problem is not harmful, but will draw cold water into water heater each time, and is energy wasteful.
Replace faucet or have plumber repair problem.

Feb 19, 2011 | Price Pfister Single Lever Handle Faucet...

1 Answer

I can not take the handle off of my shower valve to get to the cartridge. i have a seabury grohe shower valve.


There is usually a set screw near the base of the handle that holds the handle on the valve stem if the handle is metal. if it is acrylic then there is a plastic cover that hides a screw which fastens it to the valve stem.

Nov 24, 2010 | Grohe Plumbing

1 Answer

Grohe valve Grohtherm Thermostatic Rough 34-126 I turn the mixer to full hot but the temperature remains tepid. All the other faucets in the


The thermostatic stop is set too low. Havent set a grohe before but most other thermostatic shower valves work similar. pull off the handle(however a grohe handle comes off . . ) there should be a notched ring or stop which keeps the handle from going all the way hot. pull out the ring and turn it a few teeth hotter put back and reinstall handle try water temp and adjust again if necessary.

Jan 23, 2010 | Grohe Grohtherm Thermostatic Rough-In...

1 Answer

The temperature in my shower is very luke warm only at the shower


Do you mean the other faucets in the house are hot and only the shower is warm? If so there is an anti-scald adjustment on the faucet that needs to be turned up a few notches. Havent adjusted a Grohe faucet but most faucets you rmove the handle and behind the handle is a nothced adjustment ring that prevents the faucet from getting too hot. This ring, or stop, is pulled out and twisted clockwise(or counter clockwise to set higher or lower max temp, then pushed back. maybe you can look up grohe to see which way ring or stop adjusts for hotter water.

Jan 23, 2010 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

Grohe bath faucet adjustments


grohe is a faucet all by itself ,,, I would recomend to have you call there repair dept. and explain this to them, you said you put in the new cartridge and thats about all there is to it, when you put on the handle make sure it is not over tightened, sometimes it pulls on the cartridge and makes it come on by itself good luck

Feb 21, 2009 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

Leaking faucet


Hi johnparker,

The dripping is caused by the ceramic cartridge leaking. It is a non servicable part.

Couldn't find the model number listed but here is a Talia schematic.

http://www.grohecatalog.com/product/25596/

The replacement cartridges are list as 4 and 5 in for hot and one for cold. Also consider replacing part #7 it is a seat.

Good Luck and please rate this response, Phil

Dec 29, 2008 | Grohe 25 597 Talia Tub Filler w/Personal...

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