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 Grohmix thermostatic valve low flow
Author: gilmit55 (MA)

I have a Grohe 34474 Grohmix thermostatic valve in my shower that was installed 20 years ago. The flow rate has gone way down. It feeds one head via one volume control and three via the other. I changed the one head and it made no difference with only that volume control open. Is it likely that it is the "filter screens" p/n 02435 (6.1 on the Grohmix diagram). Is it possible to remove the "non return valves" and clean the screens on each side of the Grohmix? The supply is 3/4 inch and flow is excellent through the neighboring sink.

Thank you for your help.



Edited 1 times.

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 Re: Grohmix thermostatic valve low flow
Author: m & m (MD)

Removing the cartridge and cleaning the screens would be the first step. Grohe also has good tech support.

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 Re: Grohmix thermostatic valve low flow
Author: packy (MA)

yeah, the check valves come out for cleaning/flushing.

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