Fault Codes / Lennox

26 codes

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• 115 — High pressure 1. Comp 1 high pressure lockout.

LMC / Compactor

• 12 — Low pressure switch tripped.
• 13 — High pressure switch tripped.
• 18 — Compressor protection module trip.
• 30 — Water flow switch open.
• 42 — Evaporator freeze protection active.
• 45 — Phase monitor trip.

Mini-Split MWM/MPA (Außeneinheit)

• E0 — Outdoor EEPROM malfunction — main control board is not receiving feedback from the EEPROM chip.
• E3 — Communication error between outdoor unit main control and integrated power module (IPM), no feedback for 60 seconds.
• E4 — Indoor unit coil outlet temperature sensor (T2) error — voltage outside 0.06-4.94V range.
• E5 — High or low voltage protection active.
• E6 — Power Factor Correction (PFC) module protection (MPA036S4M-1P and MPA048S4M-1P only).
• E8 — Outdoor DC fan motor speed error.
• F1 — Outdoor coil sensor (T3) error — voltage outside 0.06-4.94V range.
• F2 — Outdoor ambient sensor (T4) error — voltage outside 0.06-4.94V range.
• F3 — Compressor discharge sensor (T5) error — voltage outside 0.06-4.94V range.
• P1 — High pressure switch open — trips at 639 PSI and resets at 464 PSI.
• P2 — Low pressure switch open — trips at 20 PSI and resets at 43 PSI.
• P3 — Outdoor compressor current overload sensed.
• P4 — High temperature sensed at compressor discharge line.
• P5 — High temperature sensed at outdoor coil (T3).
• P6 — Integrated power module (IPM) error.
• P7 — IPM module temperature sensor malfunction.

Mini-Split MWM/MPA (Inneneinheit)

• CP — Condensate switch (water level) alarm malfunction (M22A, M33A/B and MMDA units only).
• EC — Low refrigerant error.
• EE — Indoor Unit EEPROM malfunction.