• Sep 6, 2025 Hayward Pool Water Heater Troubleshooting Error Codes n Components: - Ensure spark gap is correct. - Replace igniter if defective. - Verify Venting: - Clear any obstructions in vent pipes. - Confirm proper airflow. If unresolved: Seek professional diagnosis. 3. High Limit Switch Trip (E03) Symptoms: He BY Ana Hoppe PhD