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Kohler k-304 rite temp valve. The shower started dripping. Replacing the cap and mixer part, it seems fine, then suddenly the shower comes on 20 minutes later without touching the handle. I am suspicious of the new mixer part. I can blow through one side of it (it will eventually seal), but the other side seems blocked.
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If this is a new installation and has always beenj this way, then I would suspect that there may be an obstruction in the cold water line leading to the valve. Or something stuck in the valve at the point where the cold water is connected. If someone has worked on thius valve recently , then I would suspect that they got the valve cartridge in backwards, If the catridge is not placed in the valve correctly the opperation is messed up.
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.
Call Kohler, most of their products have lifetime guarantees also come with diagram. Look for a set screw either beneath (underside) the handle or under a center cap on the handle. Some are obvious, others appear to be part of the design, raised outline, temp indicators etc.
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.
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