Carrier TRANSICOLD VECTOR 8100, Operation & Service Manual, Page: 217 / 294

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20101 NO COMM FROM MICRO TO REMOTE DISPLAY
• ACTIVATION: If alarm 21100 NO COMM FROM ANY BOARD TO MAIN MICRO is not active, and the
number of Remote Panels installed is configured as 1, and no sync responses have been received from
the Remote Panel Module for 10 seconds.
• UNIT CONTROL: Alarm only.
• RESET CONDITION: Auto reset when communication is restored, or alarm may be manually reset by
turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1 in
Notes Section.) Operate the unit through the appropriate modes to see if any active
alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Does the Remote Panel Work? - If panel is working, this may be an intermittent alarm caused by a bad
connection. Check connection from Comm Module to Remote Panel. Verify no damage or corrosion in
connections.
2. Check for other CAN bus alarms - This alarm may accompany other alarms, complete troubleshooting
steps for alarms found. If repairs have been made and the other alarms have cleared, further trouble-
shooting may not be required.
3. Check for Power into Remote Panel - Check for battery power at pins C & D. Verify voltage.
4. Check CAN Circuit to Remote Panel - At the Remote Panel connector, check resistance between pin A
& pin B. Verify 120 ohms.
5. Replace Remote Panel with a Known Good Panel
a. If problem re-occurs replace the Comm Module.
b. If problem goes away replace the Remote Panel.