I have an upstairs shower that is not putting out any hot water while the other upstairs shower and all other faucets in the house have no issues. The faucet is a Kohler / Coralais Model #K-T15603 lever handle, integral shut-off. Does anyone have any possible quick fixes?

Hello Mrjesylvia...

Remove the trim plate and shut off the integral shutoffs using a slotted screwdriver. Then remove the cartridge assembly inside the valve and then turn the hot water integral shutoff to on and PURGE any sediment/debris from the hot water side of the valve.

Then check that cartridge out and see if there is anything obviously wrong with it. Then re-install cartridge and turn water back on and see if that helped.

If not then you need to remove that cartridge again and take it to a local plumbing supply house and see if they have a replacement cartridge for your unit. You could also order the part online... ;)

Let me know if you have questions...

MARK