sensor fault EP21-BT2 — Supply sensor for heating system 2 not connected or defective

What does 36 mean?

The EP21-BT2 supply sensor for heating system 2 is not connected or defective. The system will then control based on the return sensor (EP21-BT3).

• EP21-BT2 sensor is disconnected or has a loose connection.
• The sensor unit is faulty.
• Wiring damage to the sensor.

Click steps to track your progress.

1. 1

   Power off the Heat Pump at the main breaker.

2. 2

   Inspect the connections to the EP21-BT2 sensor for heating system 2.

3. 3

   Ensure the sensor is correctly installed and free from damage.

4. 4

   Restore power and observe if the alarm clears. The system may operate using the return sensor.

5. 5

   If the alarm remains, contact a service technician to address the sensor issue.