Yaskawa GA800 E39 Fault — What It Means
The E39 fault code cannot be verified in the Yaskawa GA800 installation or troubleshooting documentation provided by the manufacturer. The GA800 manual instructs technicians to record the exact fault or alarm code shown on the keypad display and use that code to identify the specific problem before attempting any reset or repair. If a code does not appear in the drive’s supported fault list, the next step is to confirm the exact catalog model number from the drive nameplate and contact Yaskawa technical support with the model, serial number, and failure details.
Because E39 is not a documented GA800 fault in the available sources, the code may be a display error, a misread (such as Er-39 or another variant), or a code from a different Yaskawa drive family. The general troubleshooting process for any GA800 fault is to determine whether the issue stems from the drive itself, external wiring, power supply problems, motor issues, or communication and option card faults by using the drive’s elementary diagram and the displayed code.
Before You Replace Anything
Technicians sometimes replace the control board when the issue is actually loose wiring or an incorrect parameter setting. Always verify the exact displayed code, check all power and motor connections, and consult the drive nameplate and manual before ordering parts.
Common Causes
- Misread or mistyped fault code The code displayed may be a different fault (such as Er-39, EF, or oC) that was recorded incorrectly or the keypad display is damaged.
- Drive model mismatch The E39 code may exist on a different Yaskawa VFD series (such as V1000 or A1000) but not on the GA800, so confirming the exact catalog code on the nameplate is necessary.
- Loose or damaged wiring connections Control wiring, power terminals, or motor leads that are loose, corroded, or incorrectly landed can trigger faults that do not clear with a simple reset.
- Power supply or input phase issue Missing or unbalanced input phases, low line voltage, or a faulty contactor upstream of the drive can cause faults that are not always obvious from the code alone.
- Option card or communication fault If the drive has a communication card, fieldbus option, or I/O expansion module installed, a fault in that hardware or its wiring can produce codes that are not listed in the base drive manual.
- Parameter configuration error An incorrect parameter setting (such as motor nameplate data, acceleration time, or current limit) can cause the drive to fault in a way that displays an unexpected or undocumented code.
Quick Diagnosis
Answer these to narrow it down fast.
Does the keypad display the exact characters E39, or could it be a different code such as Er-39, EF, or a number with a dash?
No: The code may be E39 exactly. Proceed to verify the drive model and contact Yaskawa support to confirm whether E39 is valid for your catalog number.
Is the drive nameplate catalog code confirmed to be a GA800 series (such as CIMR-G8 or similar)?
No: You may have a different Yaskawa drive series. Check the nameplate and look up the fault code in the correct manual for that model family.
Can the fault be cleared using the reset button on the keypad after power-cycling the drive?
No: The fault is latched and the cause has not been removed. Inspect all wiring, verify power supply voltage and phase balance, and check for option card or communication errors before attempting another reset.
Step-by-Step Fix
- Record the exact fault code displayed on the keypad, including all letters, numbers, and symbols, and do not reset the drive until you have written it down.
- Verify the drive model by reading the nameplate on the front or side of the unit and confirming that the catalog code is a GA800 series (typically CIMR-G8 followed by additional characters).
- Check the GA800 installation manual fault table to see if E39 or a similar code is listed. If it is not found, the code may not be valid for this drive family.
- Inspect all wiring and connections at the power input terminals, motor output terminals, and control terminal block for loose, corroded, or incorrectly landed wires.
- Measure input power at the drive terminals to confirm that all three phases are present (for three-phase models) and that voltage is within the nameplate rating. Check for blown fuses or tripped breakers upstream.
- Remove and reseat any option cards or communication modules installed in the drive, and verify that their wiring and termination are correct per the option manual.
- Contact Yaskawa technical support with the exact fault code, drive catalog number, serial number, and a description of when the fault occurred. Do not reset the drive or attempt further repairs until you have confirmed the code meaning and the recommended corrective action.
Parts Often Needed
| Part | Notes |
|---|---|
| GA800 control board (PCB) | Amazon | Only replace if Yaskawa support confirms a board fault after verifying wiring and power. The GA800 maintenance document lists the control board as a field-replaceable component. |
| GA800 cooling fan | Amazon | The other field-replaceable component documented for GA800 drives. Replace if the fan is noisy, stopped, or if support indicates a thermal fault. |
When to Call a Pro
Call a qualified electrician or VFD technician immediately if the E39 code cannot be found in your GA800 manual, if the drive will not clear the fault after power-cycling, or if you are not trained to work safely on three-phase industrial equipment. VFD troubleshooting requires multimeter testing of live high-voltage terminals, verification of motor winding resistance and insulation, and sometimes oscilloscope analysis of gate drive signals or communication protocols. Because E39 is not a documented GA800 fault in the available sources, professional support from Yaskawa or an authorized service center is necessary to avoid misdiagnosis, prevent further damage to the drive or motor, and make sure compliance with electrical codes and safety standards.