Smeg oven control knobs are hard to turn, slip, or do not align with the markings.

Safety first: Ensure the oven is off and cool before working on the control panel.

• Remove knobs: Pull the knobs straight off the shafts. Clean the area behind them to remove grease and debris.
• Inspect knobs: Check for cracks or worn splines. Replace any damaged knobs with genuine Smeg replacements.
• Check shaft movement: Turn the bare shafts of the thermostat and selector. If they are very stiff, the internal component may be failing and should be replaced.
• Reinstall knobs: Align the flat or keyed section correctly and push firmly into place.