Yaskawa GA800 A.133 Fault — What It Means
The A.133 fault code format does not appear in published Yaskawa GA800 documentation. Yaskawa GA800 drives typically use alphanumeric fault identifiers such as oC (overcurrent), ov (overvoltage), or CPF06 (control circuit fault), not a dotted A.xxx format. This code may be a misread display, a parameter number rather than a fault, or a label from a different drive family or manufacturer.
Before attempting repair, confirm the exact code displayed on the keypad and review the fault history menu. Many Yaskawa faults point to wiring errors, disconnected control circuits, option-card problems, or mechanical load issues. If the code persists after verifying connections and power-cycling, consult your GA800 manual fault table or contact Yaskawa technical support to identify the true fault and recommended repair.
Before You Replace Anything
Technicians sometimes replace the entire drive when the real problem is a loose option-card connection or a damaged encoder cable. Always inspect all wiring, option cards, and control connections before ordering a replacement drive.
Common Causes
- Misread or misidentified fault code (~40%) The displayed code may be a parameter number, a different drive family’s fault, or a keypad display error rather than a true GA800 fault.
- Loose or damaged wiring and connections (~30%) Disconnected motor leads, control wiring, or option-card connections are common causes of unidentified or intermittent faults on Yaskawa drives.
- Option card or encoder failure (~15%) A faulty communication card, encoder interface, or I/O expansion module can generate non-standard fault messages or corrupt the display.
- Control board fault (~10%) Internal control circuit faults on Yaskawa drives often require control board or full drive replacement when wiring checks pass.
- Mechanical load or brake issue (~5%) A locked rotor, engaged holding brake, or excessive deceleration demand can trigger faults that may display incorrectly if the keypad or firmware is damaged.
Quick Diagnosis
Answer these to narrow it down fast.
Does the keypad display the same code after power-cycling the drive?
No: The fault may be intermittent or a display glitch. Monitor the drive under load and check fault history for additional clues.
Can you find A.133 in the fault table of your GA800 manual or technical documentation?
No: The code is likely misread or from a different source. Verify the exact alphanumeric fault on the keypad and cross-reference it with the manual.
Are all option cards, encoder cables, and control wiring firmly seated and undamaged?
No: Reseat all connections, inspect for damaged pins or broken wires, clear the fault, and test the drive.
Step-by-Step Fix
- Power down the drive safely and lock out the main disconnect to prevent accidental energization during inspection.
- Read and record the exact fault code displayed on the keypad, including any additional characters or symbols, and review the fault history menu if available.
- Cross-reference the code with the fault table in your GA800 instruction manual or technical documentation to confirm whether A.133 is a valid fault for your model.
- Inspect all wiring and connections including motor leads, control wiring, option-card seating, encoder cables, and I/O connections for loose, broken, or corroded terminals.
- Remove and reseat any option cards or communication modules to make sure good contact, and check for bent pins or debris in the connectors.
- Power the drive back on and observe the keypad display. If the same code appears and is not in the manual, contact Yaskawa technical support with your drive model and serial number.
- If the fault persists after wiring checks and the code is confirmed as a control circuit or internal fault, schedule replacement of the control board or drive with a qualified technician or Yaskawa service center.
Parts Often Needed
| Part | Notes |
|---|---|
| Yaskawa GA800 control board | Amazon | Required if internal control circuit fault is confirmed; order by exact drive model and serial number. |
| Encoder cable or option card | Amazon | Replace if damaged or corroded; verify part number compatibility with your GA800 configuration. |
When to Call a Pro
Call a qualified VFD technician or Yaskawa-certified service provider if you cannot locate A.133 in your manual, if the fault persists after inspecting all wiring and option cards, or if you suspect an internal control board or power module failure. VFD repair involves high-voltage DC bus capacitors that retain lethal charge even after input power is removed, and incorrect diagnosis can damage expensive components. A technician can use Yaskawa’s DriveWizard software to read detailed fault logs, verify firmware versions, and perform safe board-level diagnostics that are not accessible from the keypad alone.
Rough cost: A pro service call runs about $200-800 depending on repair type.