Fixing a faucet handle that operates backward (such as hot water turning on to the right instead of the left) requires reorienting the internal ceramic disc cartridge. Shut off the water supply valves under the sink, remove the handle set-screw with an Allen wrench, and pull off the handle. Lift out the cartridge, rotate it 180 degrees so the hot and cold water orientation matches the correct side, reinsert the retaining clip, and reinstall the handle. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before starting repairs. Verification: Test the handle movement to confirm that hot and cold water flow align correctly with standard labeling.
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