Very little cold water from shower valve

There's something blocking it sometimes if you turn the water off in your home and turn it back on sometimes calcium from the pipes break loose and cause blockage in new style washerless valve assemblies.

If the faucet was working before and then just stopped, it is the mixing valve or a clogged supply line.
turn the water off and remove the mixing valve. Turn the water on and see if you have good flow from both hot and cold ports inside the faucet.
Caution- this procedure can get messy, close the shower curtain or door.
Call Kohler and ask for a new mixing valve for free.

Yes the mixing valves do wear and give out........I had to put a micron filter in the input line to the hot water tank and solved the promlem for around 8 tears now. knock on wood....Hope this helps.

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.

The cartridge has 2 or 3 o-ring type seals around it that feed the water through, it picks up both hot and cold and mixes them. Some cartridges are replaced as one, some you have to replace the seals, just take the faucet info to the hardware store and match it up. I think the diverter is for the shower. It sends the water up instead of out.

Just had this same thing, on this exact faucet. If you still have the manual, it has instructions on how to rotate the valve for back to back installations where one shower has the hot/cold reversed. Our contractor got ours in backwards the first time and I had to call and have them come out and rotate the valve this morning.

The temperature is adjustable. The valve has a disc you pull off the front of valve and then rotate the seat I believe counter-clockwise. If you get the paperwork for this valve from moen it is very explanatory. I can help further if needed, Let me know!

You can try to rotate the first plastic ring to the left of center a few teeth, this will let the handle advance alittle more to the hot side.

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

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