Fault Codes / Mitsubishi Electric / U5

Mr. Slim — Heatsink (power module) temperature abnormal.

Possible causes

• Cooling air path blocked / outdoor fan stopped.
• High ambient / INV faulty.

Check steps

• Clean air path, check outdoor fan.
• Check heatsink thermistor & INV.

Affected parts

• Kühlkörper-Thermistor
• Leistungsmodul

Safety note

Source: Mitsubishi Electric resmi servis kılavuzu — MrSlimerrorCode.pdf p.4: 'U5 Abnormal temperature of heat sink'; PUY doc p.9: 'Abnormality of heatsink temperature'.

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

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