20 Most Recent Grohe Grohtemp 3/4 inch thermostat rough-in valve 34902000 - Page 5 Questions & Answers


Grohe has a lifetime warranty on faucets. Call them and ask for parts. There is some internal part that vibrates. It could be the cartridge that makes it work or if it is a kitchen faucet with a separate spray, the diverter can do this.

Grohe Plumbing | Answered on Jul 04, 2014


none of these are relevant.

Grohe Plumbing | Answered on May 20, 2014


Ive written a solution twice but for some reason it wont let me post it.I will try to abbreviate it.

You dont say how much flow it has when the pump isnt running but I suspect there isnt enough to turn on the sensor unless all the flow is one side. ie all cold.

Grohe Plumbing | Answered on May 17, 2014


None of the above solution pertains to Grohe 20 801. What I did was ...
After undo the phillips head screw inside the decorative piece, pour a lot of lime away into the hole, flooding the hole if possible, wait a while. The parts are just bound together with deposits after years of wear and tear. Now, take a hammer and use the prying end to pry up the handle with all your might and you hope it would come out. The handle came up for me after working it loose for about an hour.

Grohe Plumbing | Answered on Apr 09, 2014


The following procedure is extracted from the following link:
How do you replace GROHE single flush valve part no 43544 My discharge...

1 Lift off Cistern lid
2 Remove the bridge carrying the end of the tube from the flush button and the bellows below it. There are small catches at front and back.
3 Take hold of the tube and lift, the whole of the rest of the works comes out.
4 The lowest part has two washers and is held to the upper by one of them it can be removed from the upper by pulling it. then examine the two washers. There may be "bubbles" on either or both. These are the cause of the loss of seal and can be removed by pricking them with a pin but DO NOT pierce the washer.
5 Reassemble

Grohe Plumbing | Answered on Feb 25, 2014


Could you show us a picture of the spray head?

Grohe Plumbing | Answered on Feb 21, 2014

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