Symptom: Fan Is Hunting

Possible Cause: Poor static pressure sensor placement
Corrective Action: Check sensor signal and location. Sensor must be installed on the supply main for proper control.
Possible Cause: PID loop requires adjustment.
Corrective Action: Refer to the PID tuning document under the controller information.
Possible Cause: System requires balancing.
Corrective Action: Request a copy of testing and balancing report for the system or perform testing and balancing.