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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.

Uv4

Gate Drive Board Undervoltage

Yaskawa · iQpump1000

What does Uv4 mean?

A voltage drop has occurred in the gate drive board circuit, indicating insufficient power supply to the gate drive board. This fault is specifically detected in models 4A0930 and 4A1200.

Common Causes

  • Not enough power is being supplied to the gate drive board

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Cycle power to the drive

  2. 2

    If the problem continues, replace the gate drive board or the entire drive

Browse all codes in this manual (45)
Verified technical data. Last updated: April 2026

Related Faults

ACCUMAccumulated Level FaultAJFAnti-Jam FaultAUXFBPI Aux Lvl Loss (Wire-break detection for PI Aux Feedback Level)
Source: Yaskawa iQpump1000
Open Manual (Page 269)Search more codes in this manual