EL
ErrorLib
Brands
||
  1. Home
  2. Otis
  3. DSD 412 DC Elevator Drive
  4. F912
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.

F912

OPEN SCR/DOUBLER PACK

Otis · DSD 412 DC Elevator Drive

What does F912 mean?

The PCU detected one or more open SCR/doubler packs. This indicates a failure within the power conversion stages of the drive, preventing proper current flow.

Common Causes

  • One or more SCR/doubler packs are open.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Remove power from the drive.

  2. 2

    Consult Section 5, MAINTENANCE, to replace the SCR(s) that are open.

  3. 3

    Repeat the diagnostic test until the SCDU displays the 'PASS' message.

Browse all codes in this manual (48)
Verified technical data. Last updated: April 2026

Related Faults

117/118SERIAL COMMUNICATION FAULT400MOTOR OVERLOAD FAULT401EXCESSIVE FIELD CURRENT
Source: Otis DSD 412 DC Elevator Drive
Open Manual (Page 42)Search more codes in this manual