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To fix a stuck diverter valve, follow these steps:

1. Turn Off Water Supply: Shut off the water supply to prevent any leaks or flooding during the repair.

2. Remove the Diverter Valve:

   • Access the diverter valve, which is usually located in the faucet or showerhead assembly.
   • Use a wrench to unscrew any fittings or bolts holding the valve in place.
   • Carefully pull out the valve.

3. Inspect the Valve: Check for visible blockages, debris, or mineral buildup. If the valve mechanism appears corroded or damaged, it may need to be replaced.

4. Clean the Valve:

   • Soak the valve in a solution of vinegar and water to dissolve mineral buildup.
   • Use a soft brush to scrub any stubborn deposits.

5. Lubricate Moving Parts: Apply plumber’s grease or silicone lubricant to the moving parts of the valve to ensure smooth operation.

6. Reassemble the Valve: Reinsert the cleaned valve back into its original position and secure it with the fittings/bolts you removed earlier.

7. Test the Valve: Turn the water supply back on and check for leaks. Test the diverter valve by switching between the faucet and shower to ensure it operates smoothly.

8. Replace if Necessary: If the valve remains stuck after cleaning or is damaged, consider replacing it with a new valve.

Always refer to the manufacturer’s instructions for specific guidance related to your particular diverter valve model. If you're unsure or uncomfortable with any step, it's advisable to consult a professional plumber.