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ErrorLib — Industrial Fault Code Library

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926

PCU WATCHDOG TIMEOUT FAULT

Otis · DSD 412 Elevator System

What does 926 mean?

A problem exists with either hardware or software on the Drive Control PCB, which can lead to a PCU watchdog timeout.

Common Causes

  • Hardware failure on the Drive Control PCB.
  • Software issue with U13, U14, U39, U40 EPROMs.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check and/or replace U13, U14, U39, U40 (EPROM’s).

  2. 2

    Replace Drive Control PCB A1.

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 86)Search more codes in this manual