Turn off the water supply valve
Flush the toilet to empty the tank
Remove the tank lid carefully
Check the flapper for wear or misalignment
Replace the flapper if it is damaged
Inspect the fill valve for proper operation
Adjust or replace the fill valve if needed
Check the float level and adjust it
Tighten any loose tank bolts or connections
Inspect the flush handle and chain
Reattach or replace the chain if it is too loose or too tight
Check for leaks around the base and tank
Replace the wax ring if water leaks from the base
Tighten the supply line connection
Clean mineral buildup from internal parts
Replace cracked or broken components
Turn the water supply back on
Test the toilet by flushing several times
Verify that the tank fills and stops at the correct level
Confirm there are no leaks after repair