When I turn the hot water on the faucet turns itself off. I have to continually turn up the water to keep it going - at least until the water gets hot. The opposite is true of the cold. It's flow tends to increase constantly.
I thought the guts were just worn, so I bought replacements - but still have the same results. I'm sure it's something simple but I've never had a faucet do something like that.
Do you still have the owner's manual of the faucet? if so check under troubleshooting. It sounds like, most grohe products, a pressure problem. Did you check the pressure coming into the house? Do you have a water regulator outside the house? If so check the pressure.
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Close the hot and cold water valves in the cabinet beneath the sink to shut the water supply off to the bath faucet.
Remove the bath faucet's handle to access the valve cartridge. The faucet handle is removed by first detaching the handle's insert cap using the tip of a screwdriver or utility knife to expose the handle screw. Remove the handle screw with a Phillips screwdriver, then pull the handle off the valve cartridge stem.
Loosen and remove the cartridge valve nut with an adjustable wrench. Some faucet models retain the valve cartridge with a snap ring and are removed with snap ring pliers.
Pull the old valve cartridge out of the bath faucet base, using pliers.
Insert the new replacement valve cartridge into the faucet housing and replace the nut or snap ring removed in Step 3, using an adjustable wrench or snap ring pliers.
Reinstall the faucet's handle onto the valve cartridge post, then secure the handle's screw, using a screwdriver.
Replace the insert cap into the handle to cover the handle's screw hole.
Turn on the hot and cold water valves beneath the sink to restore the water supply.
Hi, Ensure that all water is switched off from the mains incoming tap, and hot water turn off tap under your boiler if that's the system you have.
Next open both levers of tap to ensure no water coming out, then remove heads with adjustable spanner. (Anti clockwise). Take to nearest plumbers merchant and they will supply new washers. It is a good idea before putting heads back in! get some de-scale liquid and spray them until lime-scale removed.
Screw heads back in turn off both taps and re-instate water supply. Then open both taps to clear any air in system.
And that's it.
If you find the heads are in bad order then you can buy replacments cheap enough, Just ask your merchants advice.
Hope this helps Thanks Paul.
I have the same problem and have the fix. There is a water pressure regulator on the bottom of the faucet( under the sink) this part is bad. Grohe will replace it for free. Call Grohe at630=582=7722 tell them the model # of the faucet and the color of the regulator, they will send you a new one for FREE.
You may have debris caught in the supply line or the mixing valve. You will need to take the unit apart after you have turned the water off and inspect those parts. Also, some of the new faucets have cut off valves already installed on the faucet, if you do make sure that they are fully open as well.