We just installed an aquasource kitchen faucetandhave lots of cold water but no hot water. Hoses are fine. What could be theproblem?

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Hoses are fine.

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are you saying that you have hot water to the sprayer , but not to the spout? Before you install the faucet, did you flush the supply lines?
If not, then shut the water off and remove the cartridge. Check a clean the inlet ports on the cartridge. Reassemble and test. Let me know of that helps. Good luck, Tom