!!
critical Honeywell
Error Code Proof of Air Flow Alarm
An alarm triggered when the fan is supposed to be on but proof of air flow is not detected for 60 consecutive seconds. The control system monitors a digital input from a current switch or differential pressure switch.
? What Causes This
Fan failure, blocked air flow, or disconnected proof of air flow sensor.
✓ How to Fix It
- Verify the fan is operating correctly.
- Check the current switch or differential pressure switch for proper connection.
- Clear any obstructions in the air flow path.
- If persists, contact service personnel.
Source: page 119 of the official manual
From the manual
