Display shows unrealistic water temperature (e.g., 0°C or 60°C) while pool feels normal.

Safety first: Turn off power before handling sensors or wiring.

• Compare with external thermometer: Measure pool water temperature independently to confirm the display is inaccurate.
• Check sensor placement: Ensure sensors are properly inserted into their wells or fittings and in contact with water.
• Inspect wiring and connectors: Look for loose or swapped sensor connectors on the control board.
• Replace faulty sensor: If one sensor consistently reads incorrectly, replace it with a Hewalex‑specified NTC sensor.