Alarm 173 — Air Flow Switch Open

What does ALARM 173 mean?

This alarm indicates an issue with the airflow switch, suggesting it's not detecting proper air movement. The display will show the alarm code, an alarming value, and a timestamp. More details can be found by pressing the HELP button.

• Air flow switch is not closing when it should.
• Blocked airflow preventing the switch from activating.
• Faulty air flow switch.

Click steps to track your progress.

1. 1

   Check that the air filter is not dirty or blocked.

2. 2

   Inspect the airflow switch and its connections for damage or obstruction.

3. 3

   Verify that air is flowing correctly through the unit.

4. 4

   Consult the manual for specific troubleshooting steps for Alarm 173.

5. 5

   If the problem persists, contact a qualified technician.