Siemens BACNET 125-5037 Owner's Manual page 41

Failure codes indicate the following possible problems.
Room temperature sensor failed—CHK STATUS = 1
1. The cable for the room temperature sensor may be unplugged or loose. Check both ends
to ensure that the cable is securely seated.
2. Connect directly to the controller through the room temperature sensor connection on the
BACnet VAV Actuator and check whether communication is possible. If so, the problem
lies in the room temperature sensor or its cable. If not, the problem is with the controller.
3. Contact your local Siemens Building Technologies representative.
Room setpoint dial failed—CHK STATUS = 2
1. The cable for the room temperature sensor may be unplugged or loose. Check both ends
to ensure that the cable is securely seated.
2. The controller may be incorrectly set to use a setpoint dial with a sensor that does not
have the dial. If the sensor has no dial, change STPT DIAL (Point 14) from YES to NO.
3. Connect directly to the controller through the room temperature sensor connection on the
BACnet VAV Actuator and check whether communication is possible. If so, the problem
lies in the room temperature sensor or its cable. If not, the problem is with the controller.
4. Contact your local Siemens Building Technologies representative.
Air velocity sensor failed—CHK STATUS = 4
1. The sensor tubing may be blocked, leaking, or disconnected. Check for pinched,
disconnected, or cracked sensor tubing. Correct as needed.
2. The tubing connections for the air velocity sensor may be reversed. Repipe if HI and LO
connections are incorrect.
The sensor or the BACnet VAV Actuator may be faulty.
Controller could not reach CLG FLOW MIN or below—CHK STATUS = 8
1. The actuator may be loose on the shaft. Check that the setscrew is fully tightened against
the damper shaft. Follow these torque guidelines:
• 70 ± 5 inch pounds—solid metal
• 37 ± 2 inch pounds—plastic, graphite, composite, or hollow metal (Hollow metal
2. The tubing for the air velocity sensor may be pinched, disconnected, or cracked. Check
the tubing and correct as needed.
3. The tubing connections for the air velocity sensor may be reversed. Repipe if HI and LO
connections are incorrect.
Siemens Building Technologies, Inc.
shafts require an insert to prevent shaft damage.)
Siemens BACnet VAV Actuator Owner's Manual
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