Universal Robots CB3 Error Code C71A10: Phase 1 is unconnected or not working

Universal Robots Robot Minor System

Model: CB3 (UR3/UR5/UR10) | Code: C71A10

Applicable Systems
UR3 UR5 UR10 UR3e UR5e UR10e UR16e UR20 UR30

Symptoms

The motor wires are damaged, bad connection in screw terminals or defect PCB

Possible Causes

  • The motor wires are damaged, bad connection in screw terminals or defect PCB

Troubleshooting Steps

  1. Step 1: Check joint for damaged or loose connections,
    Check if the issue is resolved after this step
  2. Step 2: Replace the joint
    Check if the issue is resolved after this step

How to Reset

Power cycle the robot controller and perform a complete reboot sequence. If the error persists, update the software to the latest version.

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Source: Universal Robots Official Error Codes Directory (https://www.universal-robots.com/manuals/EN/PDF/Shared/ErrorCodes/ErrorCodes.pdf)

Category: Robot