Troubleshooting communication failure in Relay 2500, 3500, and 4500
Learn how to troubleshoot communication failure in Relay 2500, 3500, and 4500
Issue
Error opening COM or communication failure
Cause
Power cord not connected
Resolution
- Verify the power cord is firmly connected and the wall socket is on
- Turn the power switch on
UPDATED: 30 June 2021