Fault 44 — Return sensor HP error

What does 44 mean?

The system detects an issue with the return temperature sensor in the heat pump circuit, preventing accurate measurement of the water returning to the heat pump.

• Faulty return temperature sensor.
• Loose or corroded wiring connections to the sensor.
• Sensor positioned incorrectly or obstructed.

Click steps to track your progress.

1. 1

   Attempt a manual fault reset via the info key on the unit's display.

2. 2

   Power cycle the heat pump system by turning it off at the main breaker for 60 seconds, then restoring power.

3. 3

   Visually inspect the sensor and its location for any physical damage or obstructions.

4. 4

   Check the sensor's wiring connections (if safely accessible with power off) for looseness or damage.

5. 5

   If the issue persists, contact a qualified technician to test or replace the return sensor.