DIY HVAC Tools

Fujitsu mini split error codes

Fujitsu General Halcyon systems use a two-digit code set (E:41, E:63). Units without a display flash the Operation and Timer lamps to spell the code.

Covers: Halcyon, Halcyon XLTH, Airstage multi-zone.

Type it exactly as the unit shows it. Not sure which brand? It is printed on the front of the indoor unit.

Most looked-up Fujitsu codes

E:11Serial communication error between indoor and outdoor unitsE:41Indoor room temperature sensor fault (open or short circuit)E:63Inverter faultE:65IPM (power module) faultE:97Outdoor fan motor faultE:A1Discharge temperature too highE:51Indoor fan motor fault

All Fujitsu codes

31 codes. Type to filter the list.

CodeMeaningTypeFix
E:11Serial communication error between indoor and outdoor unitsFaultDIY checks
E:12Communication error with the wired remote controllerFaultDIY checks
E:22Indoor unit capacity setting errorFaultDIY checks
E:23Indoor and outdoor unit combination errorFaultDIY checks
E:26Indoor unit address setting error (multi-split)FaultDIY checks
E:29Number of connected indoor units errorFaultDIY checks
E:32Indoor unit main board faultFaultTechnician
E:35Manual auto switch errorFaultDIY
E:41Indoor room temperature sensor fault (open or short circuit)FaultDIY checks
E:42Indoor heat exchanger (middle) temperature sensor fault (open or short circuit)FaultDIY checks
E:51Indoor fan motor faultFaultDIY checks
E:53Drain pump faultFaultDIY checks
E:62Outdoor unit main board fault (EEPROM)FaultTechnician
E:63Inverter faultFaultTechnician
E:65IPM (power module) faultProtectionTechnician
E:71Compressor discharge temperature sensor fault (open or short circuit)FaultDIY checks
E:72Compressor temperature sensor fault (open or short circuit)FaultDIY checks
E:73Outdoor heat exchanger (liquid) temperature sensor fault (open or short circuit)FaultDIY checks
E:74Outdoor air temperature sensor fault (open or short circuit)FaultDIY checks
E:75Suction gas temperature sensor fault (open or short circuit)FaultDIY checks
E:77Inverter heat sink temperature sensor faultFaultDIY checks
E:84Current sensor faultFaultTechnician
E:86Pressure sensor or pressure switch faultFaultTechnician
E:93Compressor start failureProtectionTechnician
E:94Compressor over-current tripProtectionTechnician
E:95Compressor motor control error (rotor position)ProtectionTechnician
E:97Outdoor fan motor faultFaultDIY checks
E:98Four-way (reversing) valve faultFaultTechnician
E:A1Discharge temperature too highProtectionDIY checks
E:A3Compressor temperature too highProtectionDIY checks
E:A5Low pressure protectionProtectionDIY checks

How Fujitsu shows error codes

Units with a display show the code as E:xx (E:41). Wall units without one flash the Operation and Timer lamps: count the Operation flashes for the first digit and the Timer flashes for the second, so 4 Operation flashes then 1 Timer flash is E:41. A wired controller shows the code directly. 1x codes are communication faults, 2x are configuration and combination errors, 3x and 4x are indoor board, sensor and fan faults, 6x and 7x are outdoor board and sensor faults, 9x are compressor and fan faults, and Ax codes are temperature and pressure protections.

Brands built on the same platform

These brands share a code table with Fujitsu because the same factory builds them, so their pages describe the same faults: Rheem, Ruud.

Sources

  • Fujitsu General service manuals (error code tables)
  • Fujitsu operating manuals (lamp-flash diagnosis)

Updated September 2026. Manufacturer site: www.fujitsugeneral.com/us