Safety first: Unplug the pump and allow it to cool for at least 30 minutes before touching the motor housing.

Check for dry running: Open the pump lid and confirm the strainer housing is full of water. If it is empty or mostly air, refill with water to prime the pump. Ensure all suction connections are airtight.
Inspect motor ventilation: On Bestway pumps with external motors, check the cooling vents and fan cover. Remove dust, leaves, and cobwebs with a soft brush or compressed air. Ensure the motor fan can spin freely.
Improve airflow: Make sure the pump is not enclosed in a tight box or covered with insulating material. Provide at least several inches of clearance around the motor for air circulation.
Test restart: After cooling and priming, plug the pump back in and restart. If E03 returns quickly, the internal thermal protector may be tripping due to a failing motor or capacitor, which typically requires professional replacement.

Do not bypass thermal protection or operate the pump if it repeatedly overheats.

Pump display shows E03 and the motor does not run, often after a power surge or storm.

Possible Causes