Yaskawa Error — Code H66

Understanding and Troubleshooting the Yaskawa H66 Error Code

If H66 occurs only during deceleration, the drive may be entering regenerative overvoltage, which confuses the latch detection logic. Install a braking resistor and set parameters L3-04 (Stall Prevention Selection During Decel) to 1 (Enabled with braking resistor). yaskawa error code h66

The H66 error code is a specific fault code displayed on Yaskawa drives, indicating a problem with the motor or the drive's output stage. This error code typically appears on Yaskawa VFDs, such as the A1, A2, or A3 series. Understanding and Troubleshooting the Yaskawa H66 Error Code

Power-up static checks

: Check the external sequence or controller sending the baseblock command to the digital inputs. Yaskawa America How to Reset This error code typically appears on Yaskawa VFDs,

Turn the main circuit power OFF and wait for the display to go dark before turning it back ON. This can clear temporary "glitch" alarms caused by electrical noise.