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It sounds like you probably need a new cartridge. Those screw heads are stops to turn the water off to service the valve not adjust it
It's possible the hot side may be partially closed but since you say it worked at one time I doubt this is the case
Do I need to turn off water service to remove the cartridge? Or will just having the shower supplys off work?
the screw driver stops you mention should shut the valve off
not sure what you mean by the shower supplies
do you mean there are isolating valves on the water lines to this device?
no, I just meant turn off the handle that turns on shower. The cartridge screws in right? Left loose right tight?
No the handle that turns on the shower is just a diverter the control valve is fed first
the cartridge will most likely be held in place by a hex shaped bonnet nut. They typically just slide in and out
about those screwdriver slots
does the slot turn easily or is it more like a cap with a slot in it
if it turns easily then it's probably an integral stop for servicing the valve
if they don't turn easily it's probably an access cap for a check valve
before you try to dismantle the cartridge be sure to open the valve to be sure the water is off
they do not turn easliy in either direction. they look like a nickel with a slot in it thats inset and has a lock washer on the outside that looks like you pinch it in to remove washer.
I think on the mixing side there is a check valve, at least thats what I think from searing the net for answers
Depends on the model of the valve. If the slot don't turn easily then you'll probably have to shut the whole house off. You model may have a separate pressure balancing piston which could also be the cause of the problem. Do you have a model number for the valve?
there is a sticker on the valve body that was under the chrome sleeve that fits under the handle, there are two numbers. 13373181 and 08890093 I googled both numbers with no luck.
those aren't model numbers, they're probably approval numbers
that's about all I can tell you I would need a specific model to give you specific info.
OK. would a photo of valve help?
ON the plastic box inside it says Hansgrohe and some numbers. 13373-18 and P-1X 3680 ( on this one, the 1 could be I )
Those don't fit the Hansgrohe model number pattern but give me a minute to see if I can find any info on it
No luck, this is an obsolete valve and I can't find any info on it. The screwdriver slots do look like stops. The hex nuts inside the stops look like they are probably filters/check valves. The first thing I would do is try to turn the screwdriver stops and see if it shuts off the water. The pull the hex on the hot water side off and check it for fouling
if the stops don't work you will have to shut off the whole house (unless you can find or cut in shutoffs to just the shower in the water lines)
shutting off the whole house puts you in jeopardy of having no water if something goes wrong
Thanks Rick. I will ck for fouling and if none is found, i will try the cartridge. You have pointed me in the right direction.
It looks like there is a plastic disk behind the stem that is probably covering the hex for the cartridge.Good luckPlease hit acceptThanks for using Just Answer