Control knobs on gas cooktop are stiff or difficult to turn.

Safety first: Turn off gas supply before working near valves.

• Clean around stems: Remove knobs and clean the area with degreaser. Do not spray lubricant directly into gas valves.
• Check knob fit: Ensure knobs are not cracked or rubbing against the panel.

When to call a technician: If valves remain stiff, they may need internal lubrication or replacement by a gas technician.