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Grohe Grohmix Thermostat Valve & Trim - 34436 Questions & Answers
My Grohmix 19 421 thermostatic
The problem might be fixed by removing the cartridge and cleaning it thourghly and resetting temp stop.Yes the cartridge could be bad but new parts are readily available. Depending on water quality conditions in you area it may be difficult to disassemble so it may be a good idea to have a plumber do it for you. Thank you.
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