Kone Kone Elevator Error Code 0021

Kone Elevator Major Door

Model: Kone Elevator | Code: 0021

Applicable Systems
Kone Elevator

Symptoms

Door zone fault. The door zone sensor signal is invalid or missing. The elevator cannot determine if it is ata floor landing for door operation.

Possible Causes

  • Door zone sensor (magnetic or optical) malfunction
  • Door zone sensor wiring broken or disconnected
  • Sensor alignment shifted: target and sensor misaligned
  • Sensor contaminated with dust or debris

Troubleshooting Steps

  1. Step 1: Check the equipment status and fault indicators to confirm the active fault code
    Fault indicator or HMI displays code 0021 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 safety circuit continuity and all safety interlock switches
    Safety circuit complete, all interlocks engaged
  4. Step 4: Inspect the specific safety device referenced in the fault (door switch, light curtain, E-stop)
    Safety device functional, contacts clean and responsive
  5. Step 5: Verify the brake mechanism: check brake pad wear, spring tension, and air gap
    Brake pads within wear limit, spring tension correct, air gap within spec
  6. Step 6: Test the safety function by simulating the fault condition and verifying response
    Safety function responds correctly within specified time
  7. Step 7: Reset the fault after fixing the safety device or circuit: press RESET
    Fault clears and safety system returns to ready state

How to Reset

To reset: 1) Fix the safety device or circuit fault. 2) Clear the fault on the HMI or controller. 3) Press RESET. Caution: Never bypass safety devices.

Frequently Asked Questions

  • Q: What does fault code 0021 mean on the Kone Kone Elevator?

    Fault 0021 indicates a safety-related fault. A safety device or circuit has been triggered. Always investigate the root cause before resetting; never bypass safety devices.

  • Q: Can I continue operating the equipment with fault 0021 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 Kone Fault Codes

Source: Kone Elevator Controller Manual, Kone Corporation Documentation

Category: Elevator