Mitsubishi Heavy E59

Critical

KX / FD — Compressor start failure (CM1/CM2)

Mitsubishi Heavy E59: Compressor start failure (CM1/CM2) This fault typically halts operation and needs immediate attention.

Possible causes

Liquid lock / seized compressor
Faulty inverter PCB
Low/unbalanced supply voltage

Check steps

Check supply voltage and phases
Measure compressor windings
Check inverter PCB

Affected parts

Verdichter
Inverter-Platine

Safety note

High voltage at inverter — observe discharge time.

Source: Mitsubishi Heavy resmi servis kılavuzu — MHI 'Error Codes – R410A' (MHI-branded, dist. 3D Air Sales), E59 row: outdoor unit red LED '1 to 5 times flash' — 'Compressor start-up error'.

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

Look up in Enthalio →

Related fault codes

High pressure fault.E40 Communication error during operation.E5 Outdoor DC fan motor abnormalityE48 Drain water level abnormality (float switch)E9 Communication error indoor ↔ remote controllerE1 Duplicated indoor address.E2