Cooktop knobs are hard to turn or feel stuck.

Safety first: Turn off gas and power if removing control panel parts.

Steps to check:

• Remove knobs: Pull the knobs straight off the valve stems.
• Clean area: Wipe away grease and debris around the stems with a mild cleaner; avoid soaking the valve.
• Inspect knobs: Replace any knobs that are warped or melted.
• Valve lubrication: If stems remain stiff, the gas valves may need internal lubrication or replacement, which should be done by a qualified technician.