Fault 65 — Room sensor 2 error

What does 65 mean?

The system detects an issue with room sensor 2, indicating it cannot accurately measure the room temperature in the secondary zone.

• Faulty room sensor.
• Loose or corroded wiring connections to the sensor.
• Sensor obstructed, covered, or placed in an unsuitable location.

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

   Ensure the room sensor is not covered by furniture or curtains and is away from heat sources or drafts.

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 room sensor.