Symptom: Air Proving Alarm

Possible Cause: Unit Airflow is low.
Corrective Action: Verify proper airflow. Refer to the low airflow section and resolve low airflow issues.
Possible Cause: Air proving switch pressure setting is too high.
Corrective Action: Refer to pressure switch cut sheet (Air Proving/Dirty Filter Switch IOM and adjust closing pressure.
Possible Cause: Airflow alarm delay is too short.
Corrective Action: Adjust damper delay and air proving delays at controller to allow for additional time prior to alarm.
Possible Cause: No power on circuit or bad switch.
Corrective Action: Troubleshoot circuit from load to switch to controller.
Possible Cause: Variable Frequency Drive is in alarm.
Corrective Action: Refer to VFD manual and troubleshoot error code displayed on VFD.