Lennox P5

Critical

Mini-Split MWM/MPA (Außeneinheit) — High temperature sensed at outdoor coil (T3).

Lennox P5: High temperature sensed at outdoor coil (T3). This fault typically halts operation and needs immediate attention.

Possible causes

Condenser dirty/blocked or fan failure.

Check steps

Clean condenser, check fan operation.

Affected parts

Verflüssigerlüfter

Safety note

Isolate power before cleaning.

Source: Lennox Mini-Split Systems Service Manual — Indoor and Outdoor Unit Error Codes (Corp. 1816-L7, 2018), "Extended Reference Guide - Outdoor Unit Error Codes" §4 and "Indoor Unit Error Codes" §5

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

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Related fault codes

Outdoor EEPROM malfunction — main control boarE0 Communication error between outdoor unit main E3 Indoor unit coil outlet temperature sensor (T2E4 Outdoor coil sensor (T3) error — voltage outsiF1 Outdoor ambient sensor (T4) error — voltage ouF2 Compressor discharge sensor (T5) error — voltaF3