The grill struggles to reach high temperatures (e.g., above 400°F) even with the lid closed.

Safety first: Ensure the grill is cool and unplugged before cleaning internal components.

• Clean firepot thoroughly: Remove all ash and clinkers from the firepot and surrounding area. Ensure all air holes are open.
• Inspect combustion fan: Check the fan blades for grease and dust buildup. Clean carefully and verify the fan spins freely.
• Check exhaust path: Inspect the chimney and any exhaust ports for soot or grease buildup. Clean to restore full airflow.
• Remove chamber ash: Vacuum ash from the bottom of the cook chamber and around the diffuser plate.
• Test at high setting: After cleaning, run the grill at its highest setting and monitor the temperature. If it still cannot reach the target, the fan may be weak and require replacement.