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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.

boL

Braking Transistor Overload Fault

Yaskawa · iQpump1000

What does boL mean?

The braking transistor reached its overload level, indicating excessive regenerated energy. This typically occurs due to an incorrect or undersized braking resistor, or aggressive deceleration settings.

Common Causes

  • The wrong braking resistor is installed.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Select and install the correct braking resistor appropriate for the drive and application requirements.

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 251)Search more codes in this manual