Display shows incorrect water temperature compared to a pool thermometer.

Safety first: Turn off power before handling sensors.

• Verify with multiple thermometers: Confirm actual water temperature using at least one reliable thermometer in the return stream.
• Inspect sensor placement: Ensure the sensor is fully inserted into the manifold well or threaded properly so it is in direct contact with water flow.
• Check wiring route: Keep sensor wiring away from high‑voltage lines to reduce interference.
• Replace sensor: If readings are consistently off by more than a few degrees, replace the water temperature sensor.