Heidenhain TNC 620 Error Code 101

Heidenhain CNC Major System

Model: TNC 620 | Code: 101

Applicable Systems
TNC 620

Symptoms

NC start error. The NC start command failed. The machine cannot execute NC programs.

Possible Causes

  • NC program syntax error preventing start
  • NC not in correct operating mode for program start
  • Safety circuit not ready: door open or E-stop active
  • NC internal error during program interpretation

Troubleshooting Steps

  1. Step 1: Check the equipment status and fault indicators to confirm the active fault code
    Fault indicator or HMI displays code 101 as active
  2. Step 2: Verify all electrical connections, wiring harnesses, and connector seating
    All connections secure, no corrosion, loose pins, or damaged wires
  3. Step 3: Check the system diagnostic buffer or event log for detailed fault information
    Diagnostic buffer shows the specific fault cause and timestamp
  4. Step 4: Verify power supply stability and environmental conditions
    Power supply stable, environment within specifications
  5. Step 5: Restart the equipment or power-cycle the control system
    Equipment restarts and enters normal operating state
  6. Step 6: Contact manufacturer support if the fault persists after all checks
    Support provides specific troubleshooting guidance

How to Reset

To reset: 1) Identify and fix the root cause described in the fault symptoms. 2) Press RESET on the HMI or controller, or power-cycle the equipment. 3) If the fault recurs, contact manufacturer service. Caution: Document the fault code and context before resetting.

Frequently Asked Questions

  • Q: What does fault code 101 mean on the Heidenhain TNC 620?

    Fault 101 on the Heidenhain TNC 620 indicates: NC start error. The NC start command failed. The machine cannot execute NC programs. Refer to the equipment manual and manufacturer support for specific troubleshooting steps.

  • Q: Can I continue operating the equipment with fault 101 active?

    No. The equipment has detected a fault condition and has taken protective action (typically stopping or derating). Continuing to operate without fixing the root cause may cause further damage. Always investigate and fix the fault before resuming operation.

Related Heidenhain Fault Codes

Source: Heidenhain TNC 620 Operating Manual, Heidenhain Documentation

Category: CNC