Operating Instructions

Chapter 5—Troubleshooting
5-10 Siemens Building Technologies, Inc.
4. Check priority of points to see if any are overridden. Release as appropriate.
5. The room temperature sensor or its cable may be faulty. Contact your local Siemens
Building Technologies representative.
E. ROOM TEMP (Point 4) appears as failed, *F* (Figure 5-4).
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 cable may be faulty, or the room temperature sensor may have failed. Contact
your local Siemens Building Technologies representative.
Figure 5-4. Room Temperature Sensor Displays *F* (Failed).
F. Display at the field panel shows invalid points or no points.
1. Check that the address for the ATEC in the field panel shows the correct FLN trunk
(1 to 3) and drop (addresses 0 to 98 are valid; 0 to 31 are typically used). Change if
necessary.
2. Check that CTRL ADDRESS (Point 1) in the ATEC matches its drop number in the
field panel. Change if necessary.
NOTE: Datamate allows you to communicate with an ATEC even if the address is
incorrect. (The screen may display a message when connection is being
established, but you are not prevented from communicating with the ATEC.)
3. Contact your local Siemens Building Technologies representative.
G. The controller status is failed at field panel. The screen may display
a Device Failure message.
1. Check the incoming 24 Vac power to controller (19.2 to 27.6 Vac). See Figure 5-3
on page 5-8. Correct as required.
2. Check that CTLR ADDRESS (Point 1) is set to correct value (addresses 0 to 98 are
valid; 0 to 31 are typically used).
3. See FLN Trunk Connections Check on page 5-22. Check the FLN trunk wiring for
proper connection and polarity.