EL
ErrorLib
Brands
||
  1. Home
  2. Otis
  3. DSD 412 Elevator System
  4. 901
About·Privacy·Terms

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.

901

PCU IST FAULT

Otis · DSD 412 Elevator System

What does 901 mean?

Current flow in excess of 300% of the rated armature current has been detected.

Common Causes

  • Ground fault or intermittent connection in the motor armature circuit.
  • Faulty current measuring module.
  • Poor current regulator tuning.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the motor armature circuit for ground faults or intermittent connections.

  2. 2

    Inspect the current measuring module for faults.

  3. 3

    Adjust current regulator tuning parameters.

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 87)Search more codes in this manual