Lennox P3

Medium

Mini-Split MWM/MPA (Außeneinheit) — Outdoor compressor current overload sensed.

Lennox P3: Outdoor compressor current overload sensed. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Compressor mechanically overloaded, line voltage too low, or refrigerant overcharge.

Check steps

Measure compressor current, check line voltage and refrigerant charge.

Affected parts

Verdichter

Safety note

Discharge capacitors, isolate power.

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