• E1 – High pressure protection
  • E2 – Protection against frost
  • E3 – System blocked or refrigerant leakage
  • E4 – High compressor discharge pipe temperature is high.
  • E5 – Overcurrent protection
  • E6 – Communication – Communication Error (see bottom)
  • E8 – Protection against high temperature resistance (overload protection)
  • EE – EEPROM failure
  • EU – Reduced frequency limits due to high temperature in module
  • C5 – Disconnection or cold soldering of jumper wires and other fasteners on the Electronic Board
  • F0 – Refrigerant (Gas) Deficiency, Cooling circuit error
  • F1 – Serpentine Sensor Malfunction
  • F2 – Serpentine Temperature Sensor
  • F3 – Outdoor Temperature Sensor
  • F4 – Serpentine Temperature Sensor
  • F5 – Air Intake Sensor Malfunction on Wired Controller
  • F7 – Oil Recovery
  • H1 – Mandatory Defrosting (Defrosting)
  • H3 – Compressor Overload Protection
  • H4 – Overload Protection
  • U7 – 4-way valve abnormality
  • U1 – Fault in compressor phase current detection circuit
  • U3 – DC voltage low
  • U8 – Zero pass detection circuit malfunction
  • b7 – Serpentine Pipe Outlet Temperature Sensor
  • b5 – Serpentine Pipe Inlet Temperature Sensor
  • C4 – Outdoor unit capacity code error
  • C5 – Indoor unit capacity code error
  • PF – Outdoor Unit Power Module Board Sensor Error
  • H5 – IPM Module temperature too high
  • H6 – Indoor unit fan motor does not start
  • H7 – Synchronization in compressor
  • HC – Power factor protection (PFC)
  • Lc – Start up error. Does not start again after the first start
  • LA – Outdoor unit DC fan motor malfunction
  • Ld – Compressor Phase Sequence Protection
  • LE – Compressor protection against sudden stops
  • LF – Power Protection
  • Lp – Mismatch
  • P0 – IPM in test at minimum frequency
  • P5 – Overcurrent protection in compressor phase current
  • P6 – Communication Communication Error
  • P7 – Power Module temperature sensor circuit fault (Aluminum Block)
  • P8 – Power Module high temperature protection
  • P9 – Zero pass detection circuit malfunction. AC Contactor Malfunction
  • PA – AC Current Protection
  • Pc or U1 Control Board Current Protection
  • Pd – Open circuit in temperature sensors
  • PE – Protection from temperature changes
  • PL – Undervoltage (.D.C. Voltage) Protection
  • PH – High Voltage (D.C.Voltage) Protection
  • PU – Capacitor charge failure
  • PP – Input Voltage Abnormal
  • ee – Control Card Memory Error
  • 88 – Preparation for Work