Mitsubishi Electric UE

Critical

Mr. Slim — UE = high-pressure abnormality caused by a closed stop/service (ball) valve — 'check and fully open the stop valve'. Distinct from U1 (abnormal high pressure via the 63H high-pressure switch, e.g. blocked coil or fan failure).

Mitsubishi Electric UE: UE = high-pressure abnormality caused by a closed stop/service (ball) valve — 'check and fully open the stop valve'. Distinct from U1 (abnormal high pressure via the 63H high-pressure switch, e.g. blocked coil or fan failure). This fault typically halts operation and needs immediate attention.

Possible causes

Dirty condenser / airflow blocked.
Overcharge / service valve closed.

Check steps

Clean condenser, check fan & service valves.
Measure high pressure, check charge.

Affected parts

Druckschalter (HP)
Verflüssiger

Safety note

High-pressure side — hot & pressurized. Follow F-Gas.

Source: Mitsubishi Electric resmi servis kılavuzu — Mr. Slim error code reference (MrSlimerrorCode.pdf, mitsubishielectric.com.sg): UE = kapalı stop/servis (küresel) vana kaynaklı yüksek-basınç anormalliği ('check stop valve'); U1 = 63H yüksek-basınç anahtarı. 2026-07-14 içerik düzeltmesi: önceki 'NICHT Hochdruck' metni yanıltıcıydı — UE yüksek-basınçla ilişkilidir, kök neden kapalı vanadır.

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

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