Leaking Grohe model 34-436.
Leaking Grohe model 34-436.
I purchased and installed part 47-111, (thermo element cartridge ($165.00)) based on my local plumbing store recommendation that this should fix a very consistent drip from my Grohe shower faucet. My local plumbing store is normally very reliable but I do not think they know Grohe faucets very well so I am turning to this forum for advice.
While I had the facet disassembled I cleaned and lubricated everything.
I believe my problem may be one of the stop valves. Both of them had some green corrosion which I cleaned off. I also lubricated the o rings. Before I spend any more money and take the time to tear apart the faucet again does anyone have any experience and advice? Perhaps I am missing an adjustment that would stop the leak?
Leaking Grohe model 34-436 - I've the same problem
I am a novice when it comes to plumbing. I have the same leaky grohe shower and I wonder if I should attempt the same fix or get a grohe-aware plumber.
Any advice is appreciated.
leaking Grohemix 34-434 thermostat valve
Grohe's techinical support asked me to replace the stop valves, just as jimbo suggested earlier.
"The stop valves will need to be replaced, this is part number 08.355.000
there is a company called Tapco @ 1800 782 0658 they will take orders and
My question to jimbo and rhoyerjr and others listening in:
Can I, as a novice, replace the stop valves myself or do I need a plumber who knows how to fix Grohe fixtures?
I looked at the fixture and it has only two screws connecting the fixure to the wall. Is it enough to undo these 2 screws, and pull out the fixture in order top replace the stop valves? Do I need any special tools? I think I need to shut off the water main before replacing the stop valves. Anything else I need to worry about?
Same problem, less costly solution
Replacing the stop valves is an expensive way to fix this problem. I am currently working to solve this same problem (a slow leak in my Integrated Grohmix 34-436), but I hope to solve it in a less costly way.
Before I explain my troubleshooting/repair procedure, here's a tip for mike_or: you don't need to shut off the whole house when servicing this valve; just turn off the service stops that are hidden behind the escutcheon. These are the large screws at the extreme left/right of the overall valve assembly. Just turn them 1/4 turn either way (so the slots are vertical instead of horizontal) and you can then dissect the valve to your heart's content without risking a flood.
Due to the architecture of this valve, a slow leak is virtually guaranteed to be caused by a leaky stop valve. Knowing this, my first goal was to determine which of the two (hot vs. cold) stop valves was leaking. To do this, I turned off first the cold, and then the hot service stops. The leaking stopped when I turned off the hot service stop, so I knew then the the leak was coming from the hot stop valve.
Next, I removed and inspected the hot stop valve assembly, Grohe part number 08-355. What I discovered was a worn o-ring on the inner plunger shaft. It is clear that this o-ring, which is the middle of three o-rings on the shaft, is responsible for blocking the water flow when the stop valve is turned off. So, it is likely that the leak can be stopped by simply replacing this o-ring, at a cost of maybe 25 cents, instead of the entire stop valve, at a cost of more than $100! Note: I cleaned the filter screen with a toothbrush under running water while the stop valve assembly was out and totally accessible.
Unfortunately, the Grohe parts list doesn't break out assembly 08-355 into its component parts. To get around this, I removed the worn o-ring and measured it. It measures approximately 7mm inside diameter, 12mm outside diameter, 2.5mm cross section. The o-ring material is not known, but I think any common o-ring material will work as long as the rings are properly lubricated.
Another unfortunate problem is parts availability. None of my local plumbing, auto supply or hardware stores stock this o-ring size. I contacted Grohe and appealed to them for a couple of spare o-rings. They have a good reputation for customer support, so I might get lucky and receive a few from them. If not, I suppose I will order a minimum quantity (i.e., $25 worth) of o-rings from an online supplier; if it comes down to this, I will gladly send, upon receipt of a SASE, some of my surplus o-rings to others in this situation.