Robot mower shows E20 and stops; often after long operation in hot weather.

Safety first: Turn OFF the mower and let it cool in the shade.

• Check vents: Inspect all ventilation slots and grills. Remove grass, dust, and debris blocking airflow.
• Ambient temperature: Avoid operating the mower in direct sun during peak heat if temperatures exceed the model’s rating.
• Inspect fan (if present): Some models have internal fans. Listen for fan operation when the mower is ON. If silent and hot, the fan may have failed.
• Reduce load: Raise the cutting height and mow more frequently to reduce motor load.
• Service: Persistent E20 at normal temperatures may indicate faulty temperature sensors or failing motors.