DC Under Voltage

DC Under Voltage

Otis · 400 Elevator

What does DC Under Voltage mean?

Indicates that the voltage from the power supply was under 20VDC for more than 30 seconds. This signifies an insufficient power supply or an excessive load condition on the DC bus, potentially affecting multiple components.

Common Causes

  • Shorts in the vender wiring or components.
  • Crimped or smashed wires in the vender.
  • Defective power supply unit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check for shorts in the vender.

  2. 2

    Check for crimped or smashed wires in the vender.

  3. 3

    Replace any damaged cables.

  4. 4

    If no damaged cables can be found and repaired, replace the power supply.

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Verified technical data. Last updated: March 2026

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