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