Yaskawa Error Code H66 |work| Jun 2026

By following this comprehensive guide, you can systematically eliminate the root cause of H66, minimize downtime, and keep your Yaskawa-driven machinery operating at peak efficiency.

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Document ID: YK-TB-H66-EN Rev. 1.0

(Undervoltage) are universal across their drive families, the

– De‑energise the main circuit, wait for the keypad display to go out completely, then re‑energise. This forces the drive to re‑evaluate the entire parameter set. yaskawa error code h66

Appendix — quick checklist (for technicians)

If the error persists upon power-up, disable the custom program to verify if the base drive hardware is functional. This forces the drive to re‑evaluate the entire

Connect a PC running the DriveWorksEZ software to the VFD via a dedicated USB copy unit or network connection.

: The braking resistor installed may not be large enough for the application's energy absorption needs. Blocked Ventilation : The braking resistor installed may not be

To resolve the H66 error code, technicians and engineers can try the following:

If the fault is traced to the power supply circuit or failed IGBTs, the drive typically requires replacement. Internal component-level repair (such as replacing gate drive capacitors) is rarely recommended in the field due to the complexity of calibration and the risk of consequential damage.