Mitsubishi Heavy E41

Critical

KX / FD — E41 = inverter power transistor overheat, NOT overcurrent protection (that's E42, a separate code).

Mitsubishi Heavy E41: E41 = inverter power transistor overheat, NOT overcurrent protection (that's E42, a separate code). This fault typically halts operation and needs immediate attention.

Possible causes

Compressor overloaded / winding / IGBT.

Check steps

Power off: measure winding & insulation, check inverter.

Affected parts

Verdichter
Inverter-PCB

Safety note

High voltage! Let capacitors discharge.

Source: Mitsubishi Heavy resmi servis kılavuzu — DÜZELTİLDİ: Mitsubishi Heavy Industries "ERROR CODES – R410A" (technical support document, distributed by 3D/masterxoloda mirror), page 4, E41 row: "The power transistor for the inverter has overheated." No mention of overcurrent. (Independently re-fetched and read the PDF directly rather th…

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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