Display shows ER15; grill cannot reach high set temperatures and struggles to exceed 150–180°C (300–350°F).

Safety first: Allow the grill to cool and unplug before cleaning or disassembly.

• Clean firepot and diffuser: Remove grates, drip tray, and heat diffuser. Thoroughly clean ash and carbon from the firepot and the underside of the diffuser plate.
• Check exhaust and intake: Inspect the chimney cap and exhaust path for soot or grease buildup. Ensure the air intake openings near the fan are not blocked by debris or spider webs.
• Verify fan performance: Start the grill and feel for strong airflow from the exhaust. If airflow is weak, inspect and possibly replace the combustion fan.
• Use premium pellets: Switch to high-quality, dry hardwood pellets recommended by Rösle. Avoid blended or softwood pellets that may produce less heat.
• Test at high setpoint: Set the grill to its maximum temperature and monitor with an independent thermometer. If it still cannot reach target, further diagnosis of the fan and control board may be needed.