Here are some steps to diagnose and potentially fix the problem:

Check for Debris: Sometimes, debris or sediment can get caught in the fill valve, causing it to make noise. To fix this, turn off the water supply to the toilet and remove the fill valve cap. Inspect it for any debris, and clean it if necessary. Adjust the

Water Level: The fill valve has an adjustable float that controls the water level in the tank. If it’s set too high, it can cause a noisy filling process. Adjust the float to the correct water level according to the manufacturer’s instructions.

Inspect for Damage: Look for any visible damage to the fill valve or its components. If you notice cracks or other issues, it may be necessary to replace the fill valve.

Replace the Fill Valve: If none of the above steps resolve the issue, it may be time to replace the fill valve. Over time, the internal components of the valve can wear out or become faulty, causing noise and inefficiency.

Water Pressure: Sometimes, high water pressure can contribute to a noisy fill valve. If you suspect this is the problem, consider installing a pressure-reducing valve in your plumbing system or adjusting the water pressure to a more appropriate level.

Vibrations: If the fill valve is vibrating and making noise, it may be due to a loose connection. Check that the fill valve and its associated components are securely fastened.

Water Hammer Arrestor: A water hammer occurs when the flow of water is suddenly stopped or redirected, causing a loud banging noise in the pipes. Consider installing a water hammer arrestor to prevent this noise.

Professional Help: If you’re not comfortable with plumbing repairs or if the problem persists after trying the above steps, it’s a good idea to contact a professional plumber to diagnose and fix the issue.

Remember to always turn off the water supply to the toilet before attempting any repairs or adjustments to avoid any accidents or flooding. If you’re unsure about how to proceed, it’s best to seek professional assistance to avoid causing further damage.