Fault Codes / Mitsubishi Electric / 4255

Mitsubishi Electric 4255

Critical

City Multi — Overcurrent due to short-circuited motor.

Mitsubishi Electric 4255: Overcurrent due to short-circuited motor. This fault typically halts operation and needs immediate attention.

Possible causes

Compressor winding/earth short / IGBT.

Check steps

Power off: measure compressor insulation (megger) & INV/IGBT.

Affected parts

INV-Board
Verdichter

Safety note

High voltage! Let capacitors discharge before work.

Source: Mitsubishi Electric resmi servis kılavuzu — CITY MULTI PDF s.4: '4250/4255/4256 — IPM error, Short-circuited IPM/Ground fault, Overcurrent error due to short-circuited motor, Instantaneous overcurrent (S/W detection), Overcurrent (effective val

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