Fault Codes / Mitsubishi Heavy / E54

High

KX / FD — E54 covers BOTH the high-pressure sensor (PSH, 2 flashes) AND the low-pressure sensor (PSL, 1 flash), distinguished by the LED flash count.

Possible causes

• Sensor faulty / wiring / connector.

Check steps

• Cross-check LP sensor with gauge, check connector.

Affected parts

• Niederdrucksensor

Safety note

Source: Mitsubishi Heavy resmi servis kılavuzu — DÜZELTİLDİ: Mitsubishi Heavy Industries KX-T-378 service manual (fdc-kxze2_trouble.pdf, mhi-hvac.co.uk) — E54 / E54-1,2: High pressure sensor anomaly (PSH) / Low pressure sensor anomaly (PSL); footnote: E54-1 = 1-flash (PSL), E54-2 = 2-flash (PSH). Independently cross-verified against becool…

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

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