What does Yaskawa GA800 A.107 Fault - Causes & Fix mean?

A.107 is not a verified GA800 code in manufacturer docs. Most GA800 comm alarms trace to wiring errors or disconnected cables. Check keypad text.

How do I fix Yaskawa GA800 A.107 Fault - Causes & Fix?

Work through the step-by-step fix below. Start with the quick reset and the most common cause, then check the specific part this guide points to. Most fixes need only basic hand tools and the right replacement part.

Can I keep using my Yaskawa appliance with GA800 showing?

Usually not. Yaskawa appliances show this error when a part or safety circuit is out of range, so running it can stop the cycle or make the problem worse. Diagnose and clear the error before normal use.

What part is most commonly replaced for Yaskawa GA800 A.107 Fault - Causes & Fix?

The parts that most often fix Yaskawa GA800 A.107 Fault - Causes & Fix are listed in the parts section of this guide. Match the part to your exact model and serial number before you buy.

Is Yaskawa GA800 A.107 Fault - Causes & Fix a DIY repair or do I need a technician?

Many fixes are DIY-friendly with basic tools, such as door switches, drain pumps, water inlet valves, thermostats, heating elements, and filters. Sealed-system, refrigerant, gas, or high-voltage work should go to a licensed technician for safety.

Yaskawa GA800 A.107 Fault - Causes & Fix

Yaskawa GA800 A.107 Fault — What It Means

A.107 is not a standard fault code confirmed in available Yaskawa GA800 documentation. The GA800 uses alarm codes with specific text descriptions on the keypad display. If you are seeing A.107, double-check the exact text shown on the keypad or consult your drive’s manual, because the code may be misread or specific to a custom parameter setup.

Verified GA800 communication alarms (such as serial transmission errors) are caused by incorrect wiring, short circuits in the communications cable, or disconnected cables. If an option card is installed, poor seating or damaged connectors can also trigger network faults. Always record the exact alarm text before resetting or cycling power.

Before You Replace Anything

Technicians sometimes replace the drive control board before checking basic wiring and option-card seating. Inspect all communication cables, terminations, and the physical condition of any network module first.

Jump to Fix

Common Causes

Incorrect communication wiring (~35%) Reversed polarity, wrong signal pairing, or improper termination on serial or network cables will generate communication faults on the GA800.
Short circuit in communication cable (~25%) Damaged insulation or pinched wires create shorts that prevent data transmission and trigger comm alarms.
Disconnected or loose communication cable (~20%) A cable that has worked free from its terminal or connector will immediately fault the drive’s communication link.
Option card not fully seated (~15%) An Ethernet or fieldbus card that is not pressed firmly into the drive backplane will show as a bus communication error.
Bent or damaged RJ45 or connector pins (~5%) Physical damage to the network port or communication terminals prevents reliable signal contact.

Quick Diagnosis

Answer these to narrow it down fast.

Does the keypad show the exact text 'A.107' or different alarm wording?

Yes: Write down the full text exactly as displayed and consult the GA800 instruction manual appendix or contact Yaskawa support with the model and serial number.
No: If the display shows a different code or alarm text, use that confirmed code to guide troubleshooting.

Is a communication or option card installed in the drive?

Yes: Power down, remove the card, inspect the edge connector and backplane pins for damage, then reseat the card firmly and power back up.
No: Focus on external communication wiring between the drive and any HMI, PLC, or network device.

Are all communication cable shields and grounds terminated correctly?

Yes: Check for continuity and shorts along the entire cable run, and verify signal-pair polarity matches the wiring diagram.
No: Correct grounding and shield termination per the GA800 installation manual, then reset the fault from the keypad.

Step-by-Step Fix

Record the exact alarm text displayed on the GA800 keypad before cycling power or pressing reset.
Power down the drive and lock out incoming AC supply per your facility safety procedures.
Inspect all communication cables for physical damage, loose terminals, reversed polarity, and correct shield grounding per the wiring diagram.
If an option card is installed, remove it, check for bent pins or debris in the backplane slot, and reseat the card until it clicks firmly into place.
Restore power and observe the keypad for any immediate alarm repeat or normal run-ready status.
Press the RESET key on the keypad or use the reset function in the drive menu to clear the fault after confirming the cause is removed.
Contact Yaskawa technical support with the drive model, serial number, and exact alarm text if the fault persists or if A.107 is not listed in your manual.

Parts Often Needed

Part	Notes
Yaskawa GA800 communication cable (shielded twisted-pair)	Amazon \| Match cable type and gauge to the protocol (RS-485, Ethernet, DeviceNet) shown in your wiring diagram.
Yaskawa GA800 option card (Ethernet, fieldbus, or serial)	Amazon \| Order by catalog number for your protocol. Verify compatibility with your GA800 firmware revision.

When to Call a Pro

Call a qualified VFD technician or Yaskawa-authorized service provider if you cannot confirm the exact meaning of A.107 from your manual, if the fault reappears after wiring corrections, or if you lack lockout-tagout training for industrial motor-drive systems. Communication troubleshooting often requires protocol analyzers, network configuration tools, and access to Yaskawa Drive Wizard software. A technician will verify option-card firmware, check parameter settings for baud rate and node address, and test signal integrity with proper instruments before replacing hardware.

Rough cost: A pro service call runs about $150-400 for wiring repair or option card replacement.