Yaskawa A1000 CPF19 Fault — What It Means
CPF19 on a Yaskawa A1000 variable frequency drive is a CPU error within the control circuit fault group (CPF11–CPF21). The drive has detected an internal failure in its control electronics, not a problem with the motor, wiring, or load. This is a hardware-level fault that tells you the drive’s logic circuitry or control board has failed or been damaged.
Yaskawa’s fault table lists the corrective action as cycling power and, if the fault persists, replacing the control board or the entire drive. Unlike motor overloads or communication faults, CPF19 points to internal damage in the drive itself, often requiring board-level or complete unit replacement rather than field adjustments.
Before You Replace Anything
Technicians sometimes swap the digital operator or inspect external wiring first, but CPF19 is a CPU fault inside the drive. Power-cycle the unit and check the fault history before ordering parts. If the code returns immediately, the control board or drive hardware is at fault, not accessories.
Common Causes
- Failed control board (~60%) The drive’s internal control-board hardware has failed due to component wear, electrical stress, or damage, triggering the CPU error.
- Damaged CPU or control electronics (~25%) The central processor or associated control logic has sustained hardware damage, causing the drive to halt and report CPF19.
- Electrical interference or transient damage (~10%) A power surge, electrical noise, or transient event has damaged control circuitry, though Yaskawa notes manual reset may clear interference-related faults only if hardware is not already damaged.
- Broader internal hardware failure (~5%) Damage extends beyond the control board to other internal drive components, requiring complete drive replacement.
Quick Diagnosis
Answer these to narrow it down fast.
Does the fault clear after you power-cycle the drive and stay cleared during normal operation?
No: The control board or internal hardware is damaged. Proceed with diagnostic steps and plan for control-board or drive replacement.
Does the drive's fault history show repeated CPF19 codes or other CPF control-circuit faults (CPF11–CPF21)?
No: This may be the first occurrence. After power-cycling, test the drive under load and log any new faults before committing to parts.
Is there visible damage (burn marks, swollen capacitors, corrosion) on the control board or inside the drive enclosure?
No: The failure is internal without visible signs. Follow Yaskawa's guidance to replace the control board and escalate to full drive replacement if the fault persists.
Step-by-Step Fix
- Power-cycle the drive by removing AC input power, waiting 30 seconds, then restoring power and attempting a manual reset as directed by Yaskawa for CPF19.
- Check the fault history using the digital operator or software interface to see if CPF19 has occurred before or if other CPF control-circuit codes (CPF11–CPF21) are logged.
- Run the drive under no-load or light-load conditions after the reset to confirm whether the fault returns immediately or only under specific operating conditions.
- Inspect the control board and interior for visible signs of damage, including burn marks, failed components, swollen capacitors, or evidence of electrical arcing or moisture intrusion.
- Replace the control board if your A1000 model uses a field-replaceable control board and you have confirmed the fault recurs without external cause. Follow Yaskawa service procedures for your specific model and horsepower rating.
- Replace the entire drive if the fault persists after control-board replacement, if the drive shows broader internal damage, or if your model does not support control-board replacement in the field.
- Document the failure mode including fault history, operating conditions, and any environmental factors (heat, humidity, electrical disturbances) to prevent recurrence and inform warranty or service claims.
Parts Often Needed
| Part | Notes |
|---|---|
| Yaskawa A1000 control board | Amazon | Model-specific. Verify exact A1000 frame size and firmware revision before ordering. Not all models support field replacement. |
| Yaskawa A1000 complete drive assembly | Amazon | Replacement drive matched to your horsepower, voltage, and enclosure type. Required if control-board swap does not resolve CPF19 or damage is extensive. |
When to Call a Pro
Call a qualified drives technician or electrical contractor if you see CPF19 on your Yaskawa A1000. This fault involves internal control electronics and requires expertise in VFD diagnostics, safe high-voltage lockout, and proper board or drive replacement. A technician will power-cycle the unit, review the fault log, inspect the control board for damage, and determine whether board-level replacement is feasible or whether the entire drive must be replaced. Attempting DIY repair on a VFD control board without training risks electric shock, further damage to the drive, and voiding manufacturer support. Professional service also ensures the replacement drive or board is correctly configured for your motor parameters, communication protocols, and application requirements.
Rough cost: A pro service call runs about $400–$1,200 for control-board replacement; $1,500–$5,000+ for drive replacement depending on horsepower.