Heater shows E16; unit may shut down shortly after ignition

Safety first: Turn OFF power. Water may be very cold; avoid prolonged contact.

• Check actual water temperature: Measure pool water with a reliable thermometer and compare to the heater display. Large differences indicate sensor issues.
• Inspect inlet sensor: Locate the inlet temperature sensor on the header. Ensure it is fully inserted and secured.
• Verify wiring: Check the sensor cable for damage and reseat the connector at the control board.
• Replace if faulty: If E16 persists and readings are clearly wrong, replace the inlet temperature sensor with a Poolworld-compatible part.

Warning: Freeze protection features are important for preventing damage; do not bypass or disable them.