CPF38
Control Circuit Error
Yaskawa · Drive Fault Codes
What does CPF38 mean?
A control circuit error indicating a malfunction within the drive's internal control logic or hardware. This fault often points to damaged internal components that necessitate power cycling and replacement of the affected hardware.
Common Causes
- Internal hardware malfunction on the control board due to component failure
- Transient electrical noise or severe disturbance affecting the control circuit's operation
- Degradation or failure of internal electronic components over time.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Perform a power cycle by disconnecting and reapplying input power to the drive completely.
- 2
Visually inspect the control board for signs of damage or burn marks on components.
- 3
If the fault persists, replacement of the drive control board or the entire drive unit may be necessary.
Verified technical data. Last updated: March 2026
Related Faults
Source: Yaskawa Drive Fault Codes