Plumbing Questions? Ask a Plumbing Expert.
So far it sounds like a bad cartridge, have you tried a new one yet?
We can go from there.
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If changing the cartridge fails, look at the single handle for a defect that is not pulling the cartridge out or rotating it when the handle is operated.
Hello again, the handle may be rotating properly but *not engaging the cartridge.
Look that over, lets see what we can discover.