Plumbing Questions? Ask a Plumber and Get Answers ASAP.
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What do you have for a kitchen faucet? is it a single lever (not 2 handle) faucet? do you have a re-circulating line on the hot water?
Ok, you could have a bad cartridge in the faucet. Another possibility is a problem with the check valve on a re-circulation line but you didn't answer my question about that.