What does Yaskawa GA800 A.143 Fault - Causes & Fix mean?

A.143 is not a standard GA800 fault code. Confirm the exact display text and check your fault history menu before diagnosing further.

How do I fix Yaskawa GA800 A.143 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.143 Fault - Causes & Fix?

The parts that most often fix Yaskawa GA800 A.143 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.143 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.143 Fault - Causes & Fix

Yaskawa GA800 A.143 Fault — What It Means

A.143 does not appear in Yaskawa GA800 documentation as a standard alarm code. GA800 drives typically display alphanumeric fault names such as oC, ov, GF, or CPFxx rather than decimal-style codes like A.143. This means the code may be misread from the keypad display, or it may belong to a different Yaskawa series or a parameter/monitoring screen rather than the fault list.

Before attempting any repair, confirm the exact text shown on the keypad, including all letters and punctuation. Pull the fault history from the drive’s monitor or history menu and compare the alarm name to the GA800 manual specific to your drive model. If the code is actually a control-circuit or overvoltage fault with a similar appearance, follow the applicable Yaskawa diagnostic path for wiring, parameter checks, and power cycling before replacing any hardware.

Before You Replace Anything

Technicians sometimes replace the control board or entire drive without first verifying the exact alarm code and checking wiring, motor cable length, and deceleration parameters. Always pull the fault history and compare the displayed code to your GA800 manual before ordering parts.

Jump to Fix

Common Causes

Misread or misrecorded fault code (~40%) The keypad display may have been read incorrectly, or the code may belong to a parameter screen rather than a fault alarm.
Code from a different Yaskawa series (~25%) The displayed code may be valid for a different Yaskawa VFD family but not listed in GA800 documentation.
Control board communication error (~15%) A corrupted display or keypad communication fault can show unexpected codes that are not in the alarm table.
Option card or expansion module fault (~10%) An installed option card may generate a code not listed in the base GA800 manual.
Firmware or parameter corruption (~10%) Parameter memory corruption or a firmware mismatch can display non-standard alarm codes.

Quick Diagnosis

Answer these to narrow it down fast.

Does the keypad show the exact same code each time you power-cycle the drive?

Yes: The fault is persistent and is most likely a real alarm or a hardware communication issue. Pull the fault history from the monitor menu and compare the code to your GA800 manual.
No: The code may be transient noise or a display glitch. Record the code, pull the fault history, and verify wiring connections before cycling power again.

Do you have any option cards or expansion modules installed?

Yes: Check the option card manual for additional alarm codes specific to that module, as those codes may not appear in the base GA800 documentation.
No: The code should be in the base GA800 alarm list. Confirm the exact display text and compare it character-by-character to the manual.

Can you pull a fault history log from the drive's monitor menu?

Yes: Review the fault history for the actual alarm name and timestamp. Use that name to look up the fault in the GA800 manual and follow the documented troubleshooting steps.
No: Write down the exact keypad display text, power-cycle the drive, and watch for the code to reappear. Take a photo of the display and consult the GA800 manual or a qualified technician.

Step-by-Step Fix

Write down the exact display text including all letters, numbers, and punctuation as shown on the keypad, and take a photo if possible.
Access the fault history menu on the keypad (consult your GA800 manual for the specific monitor parameter number) and record all stored alarm codes and timestamps.
Compare the recorded code to the alarm list in your GA800 manual, checking character-by-character for matches or similar codes.
Power-cycle the drive by removing control and main power, waiting 60 seconds, then restoring power and observing whether the same code reappears.
Inspect all wiring and terminals at the drive, motor, and control inputs for loose connections, corrosion, or damage, and verify motor cable length and routing meet Yaskawa guidelines.
Check option card documentation if any expansion modules are installed, as additional alarm codes may be listed in the option card manual rather than the base drive manual.
Contact Yaskawa technical support or a qualified technician with the exact code, fault history log, and drive model number if the code cannot be verified in the GA800 documentation.

Parts Often Needed

Part	Notes
Yaskawa GA800 control board	Amazon \| Only if a verified control-circuit fault persists after wiring and power-cycle checks.
Yaskawa GA800 keypad/operator interface	Amazon \| Replace if the display is corrupted or shows non-standard characters after a power cycle.

When to Call a Pro

Call a qualified technician or contact Yaskawa technical support if you cannot verify the displayed code in your GA800 manual, if the fault history menu is inaccessible, or if the code reappears after wiring inspection and power cycling. VFD troubleshooting requires familiarity with motor control parameters, AC drive wiring standards, and manufacturer-specific alarm definitions. A technician with Yaskawa experience can pull diagnostic data, compare the code to the correct manual for your firmware revision, and replace the control board or drive only after confirming the fault through proper testing.

Rough cost: A pro service call runs about $200-800.