CNV Hall CT fault

Hitachi Elevator Critical Elevator

Model: MCA | Code: 9D

Applicable Systems
WJ200

Symptoms

Converter Hall CT (current transformer) fault detected

Possible Causes

  • Converter side Hall CT sensor failure
  • CT signal loss
  • CT wiring broken
  • CT calibration error

Troubleshooting Steps

  1. Step 1: Check converter Hall CT
    Verify the fault is resolved after completing this step.
  2. Step 2: verify CT wiring
    Verify the fault is resolved after completing this step.
  3. Step 3: recalibrate CT
    Verify the fault is resolved after completing this step.
  4. Step 4: replace if faulty
    Verify the fault is resolved after completing this step.

How to Reset

Power cycle; replace CT if needed

Related Hitachi Fault Codes

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Category: Elevator

Published: 2026-10-11