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ErrorLib — Industrial Fault Code Library

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F911

SHORTED SCR

Otis · DSD 412 Elevator System

What does F911 mean?

This fault is detected by the PCU Diagnostics function (Function #998) and indicates that one or more SCRs (Silicon Controlled Rectifiers) or doubler packs within the DSD 412 drive are shorted.

Common Causes

  • Failure of an SCR or doubler pack, resulting in an internal short circuit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Remove power from the drive.

  2. 2

    Identify and replace the shorted SCR(s).

  3. 3

    Repeat the PCU Diagnostics function to confirm the issue is resolved.

Browse all codes in this manual (57)
Verified technical data. Last updated: April 2026

Related Faults

117/118SERIAL COMMUNICATION FAULT400MOTOR OVERLOAD FAULT401EXCESSIVE FIELD CURRENT
Source: Otis DSD 412 Elevator System
Open Manual (Page 43)Search more codes in this manual