The diverter valve for Grohe shower wand doesn't engage

The water gets to the shower head by the diverter. Check that.

Depends on where the diverter valve is on the tub. If you pull up on a knob on the water spout for the tub, then it's not likely the leak will ever stop completely. If the diverter valve is in the wall then a repair kit can be had at any home improvement store.

reassembled the diverter incorrectly

Hi,

Your valve is defective and need repairing or replacement

Regards

Yes, it can be fixed. Just replace the diverter valve, not a big deal.

the diverter is stuck. you have to move it up and down to free it up. the diverter is the mechanism attached to the tub spout that switches the water from shower to tub. you may also need a new diverter if fiddling with it doesn't work.

install a shower head diverter, it is a push pull valve that goes on the shower arm before the shower head

This is what you should have... Grohe Grohmix Thermostat Valve & Trim - 34436

Paraffin cartridge

Lever volume control

Grip ring temperature control

1/2" NPT female connections

Service stops

Includes rough-in valve and trim

Integrated temperature and volume control

Requires Twin Ell (03 671) for shower/tub combinations with diverter spout Note:

Requires Twin Ell (03 671) for shower/tub combinations with diverter spout

Grohe Grohmix Thermostat Valve & Trim - 34436

It is very possible that a piece of rubber from the old washer or some debris has found its way into the shower diverter or the showerhead. The first thing to try, is to take off the showerhead and see if you get water without it. If you get water then your problem is solved!!! Puchase a new showerhead or take apart the old one and soak it in CLR or Lime-Away to clean it. If that doesn't do the trick than, Turn off your water supply to hot and cold. Remove the diverter (if possible) and inspect for debris. If you want you can also take out the hot and cold stems for a total inspection of the inside of the faucet. You can then flush out the inside of the faucet cavity with a Turkey Baster or something to that effect. Put it all back together ( use a bit of vasaline on all the rubber washers so they do not get stressed when re-installing) and you should be able to take a shower.....Also, if it was a cartridge you replaced, you may have inserted it 180 degrees opposite......Hope this helps.....Joe

hiit sounds as though the diverter valve is sticking in the mid position although you have turned it to the floor spout as you call it!!
Also it sounds as though the seals are possibly leaking causing the plasterboard (drywall) to get we, or possibly a joint may be leaking. Advice access the pip-work valve etc run shower & check with torch (flashlight) to see where its coming from?
Rectification work replace seals/repair leak...replace diverter valve assembly.

Kindly

Richie (UK)