Err: AZ1-BT21 21 — Extract air sensor fault

What does Err: AZ1-BT21 21 mean?

This error concerns the extract air temperature sensor (AZ1-BT21). Potential causes are an open or short circuit, a defective sensor, or a blocked circulation pump in the FLM module.

• Open-circuit or short-circuit on sensor input
• Defective extract air sensor
• Circulation pump (AZ1-GP2) in FLM is blocked

Click steps to track your progress.

1. 1

   Verify the connections of the extract air sensor.

2. 2

   Check the sensor and circulation pump for any blockages or damage.

3. 3

   Reset the alarm using the alarm menu.

4. 4

   Contact your installer if the problem is not resolved.