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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

Door Switch

Door Switch Open

Otis · 400 Elevator

What does Door Switch mean?

Indicates that one or both of the vender's door switches have been open for more than one hour. This can be caused by a physical obstruction, wiring issue, or a faulty switch, potentially leading to operational lockout.

Common Causes

  • Upper or lower vender door switch is sticking.
  • Upper or lower vender door switch is miswired.
  • Connector for the door switch cable running to the VMC board is faulty.
  • Switch harness to the VMC board has broken or pinched wires.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check both the upper and lower vender door switches to see if either one is sticking or miswired.

  2. 2

    Check the connector for the switch cable running to the VMC board.

  3. 3

    Check to see if the harness has broken or pinched wires.

  4. 4

    Replace the door switches if they are defective.

  5. 5

    Repair or replace the switch harness to the VMC board.

Browse all codes in this manual (41)
Verified technical data. Last updated: April 2026

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Source: Otis 400 Elevator
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