Grohe Water Heaters - Recent Questions, Troubleshooting & Support

Carl, The Cartradge is needing replacement... https://www.chicagofaucetshoppe.com/Grohe-32319000-p/gro-32319000.htm#parts Best to you.

Here are the parts schematics and sellers of parts. https://www.google.com/search?q=Grohe+integrated+Grohmix+34+436 'temp knob does not work', but you don't say in what way, but some help here. Google will normally find any issue https://www.google.com/search?q=grohe+integrated+grohmix+34+436+temperature+knob+not+working ....

Limit message is when the output water set temperature can not be reached, this is normally when the incoming hot water to the shower unit is not sufficiently hot. Service code 20 is something else inside the unit that is faulty, it could be a number of faults. Try reset Power down unit and re-start, it will either say Wait or Priming, after that it should restart, hopefully it will work. If not, you could have a internal fault with: The mixer valve/motor, the flow control valve or motor, the flow sensor. If you have hot water from other taps, then the mixer valve/motor is the most likely fault. If you only have cold water only from the shower head with limit message it could be the Hot solenoid controlled valve is faulty. Good luck as there are no spares available!

I would look on u tube for a video on this . Or contact the makes on how to do this and if its possible . Some makes are factory set .

its called a flow switch it is in the pump can b replaced when u turn on it pumps air in valve shuts replacemnt will sort it

Very hard to acquire parts... just replace it as this is quicker and easier.

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.

Yes it sound like you have blockage in the mixer .

If you have single handle facute one bad cartridge in the system may be acting like a mixing valve and allowing cold water to mix with hot not allowing water to get hot enough .

wHAT DOES THE MANUAL SAY ?

your answer should totally be in the instructions of the valve that should have come with the valve,..good luck