Flt: AZ1-BT20 20 — Exhaust air sensor fault

What does Flt: AZ1-BT20 20 mean?

This indicates a fault with the exhaust air temperature sensor (AZ1-BT20). Causes include open or short circuits, a defective sensor, or a blocked circulation pump in the FLM module.

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

Click steps to track your progress.

1. 1

   Check the connections for the exhaust air sensor.

2. 2

   Inspect the sensor and the circulation pump for obstructions or damage.

3. 3

   Reset the alarm through the alarm menu.

4. 4

   If the issue persists, consult your installer.