What does Hitachi WJ200 / WL200 VFD Fault Codes Guide mean?

Hitachi WJ200 and WL200 VFD fault codes explained. Diagnose overcurrent, ground fault, undervoltage, EEPROM, and overheating trips quickly.

How do I fix Hitachi WJ200 / WL200 VFD Fault Codes Guide?

Start with a power-cycle reset and the most common cause. Work through the step-by-step diagnosis in this guide, and confirm the faulty part before replacing anything. Most fixes need basic hand tools and the right part.

Hitachi WJ200 / WL200 VFD Fault Codes Guide

Hitachi WJ200 / WL200 Fault Codes

Hitachi WJ200 and WL200 drives are common on pumps, fans, and light machinery. Their fault list centers on current, voltage, thermal, and memory protection.

Common Hitachi Faults

Fault	Meaning	Quick Fix
E01	Overcurrent at constant speed	Check load and motor wiring
E02	Overcurrent during decel	Lengthen decel time
E03	Overcurrent during accel	Lengthen accel time
E05	Overload protection	Check motor FLA and load
E07	Overvoltage	Increase decel time
E08	EEPROM/CPU fault	Power cycle, replace drive if persistent
E09	Undervoltage	Check line voltage
E12	External trip	Check fault input terminal
E13	Ground fault	Test motor and leads
E14	Overtemperature	Clean cooling path, check fan

Best First Checks

Inspect motor leads for insulation damage
Verify nameplate motor data entered correctly
Check if fault occurs on accel, decel, or run — that narrows the cause fast
Clean the heatsink and fan path

Bottom Line

Hitachi faults usually tell you when in the motion profile the problem occurred. Use that clue — accel faults, decel faults, and run faults point to different fixes.

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