New kohler shower valve worked good for a year, now the shower is either all hot water or off. I checked the set screw, I turned off the hot water to the shower and only a trickle of cold comes out the heads. Seems to be a problem with the thermostatic mixing valve. Is there a fix or is this a replace situation?
The mixer has a non return valves inlet plus a filter
So if you unscrew the shower the non return could be stuck spring inside
Probably some pipe rust clogged the exit.
If u have pretty low pressure on one or both, hot and cold water, try keep force closed by hand the water exit at shower pipe, then start both cold and warm water gradually as much as u can keep it closed with the hand.
The pressure of the water will try "escape thru the clogged pipe and hopefully unlock that debris or rust!
The hot water pressure going back thru the cold water pipe might unclog that debris.
Just a simple fix which many times works as a charm..
Otherwise if this is not fixing, try close both water from main service valve.
Then unscrew the secondary shower valves and manually clean them or replace if very damaged.
SOURCE: no water coming out of my Kohler Forte R10275-4-BN shower valve
This is a pressure balancing valve that needs both cold and hot water pressure to operated. It is an anti-scald safety operation.
Good Luck, Phil
SOURCE: Pressure problem with Kohler shower faucet??
Hi pglaw,
My best guess is the supply valve for the hot side isn't open all the way. This valve is right on the valve and is accessed by taking off the front cover plate. This would still allow the pressure balancing valve to let water through but then you would have a small flow on the hot side.
If this isn't it then then cartridge is bad.
Please rate this response and good Luck,, phil
SOURCE: faucet issue
Sounds like it was installed upside down or the cartridge is installed improperly
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