DIY HVAC Tools

York mini split error codes

York's M-Series inverter-driven ductless units (DHM and DHP models) are built by Gree and use the Gree code set, shown on the indoor display and as lamp flash counts, with the same code on the outdoor unit's two-digit display.

Covers: M-Series inverter-driven (DHM / DHP), York multi-zone (DHM…CMB).

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 York codes

E6Communication error between indoor and outdoor unitsE1High pressure protectionF1Indoor ambient (room) temperature sensor fault (open or short circuit)H6Indoor fan motor not running (no feedback)E5Over-current protectionF0Refrigerant shortage or system blockage detectedH5IPM (inverter module) protectionE3Low pressure protection (refrigerant shortage or blockage)

All York codes

55 codes. Type to filter the list.

CodeMeaningTypeFix
E1High pressure protectionProtectionDIY checks
E2Indoor anti-freeze protectionProtectionDIY
E3Low pressure protection (refrigerant shortage or blockage)ProtectionDIY checks
E4Compressor discharge temperature too highProtectionDIY checks
E5Over-current protectionProtectionDIY checks
E6Communication error between indoor and outdoor unitsFaultDIY checks
E7Mode conflict (multi-zone)ProtectionDIY
E8High temperature protection (overheating)ProtectionDIY checks
E9Indoor unit water-full (drain) protectionProtectionDIY
EEEEPROM (memory) error on a control boardFaultTechnician
FoRefrigerant recovery (pump-down) modeStatusDIY
F0Refrigerant shortage or system blockage detectedFaultDIY checks
F1Indoor ambient (room) temperature sensor fault (open or short circuit)FaultDIY checks
F2Indoor evaporator coil temperature sensor fault (open or short circuit)FaultDIY checks
F3Outdoor ambient temperature sensor fault (open or short circuit)FaultDIY checks
F4Outdoor condenser coil (middle) temperature sensor fault (open or short circuit)FaultDIY checks
F5Compressor discharge temperature sensor fault (open or short circuit)FaultDIY checks
F6Overload frequency limiting (protection)ProtectionDIY
F8Over-current frequency limiting (protection)ProtectionDIY
F9High discharge temperature frequency limiting (protection)ProtectionDIY
FHAnti-freeze frequency limiting (protection)ProtectionDIY
H1Defrost cycle runningStatusDIY
H3Compressor overload protectionProtectionDIY checks
H4System overload protectionProtectionDIY checks
H5IPM (inverter module) protectionProtectionTechnician
H6Indoor fan motor not running (no feedback)FaultDIY checks
H7Compressor desynchronization (loss of sync)ProtectionTechnician
HCPFC (power factor correction) protectionProtectionTechnician
U7Four-way (reversing) valve faultFaultTechnician
U8Indoor fan (PG motor) zero-crossing detection errorFaultDIY checks
C5Jumper cap malfunction (missing or wrong jumper)FaultDIY checks
PHDC bus high voltage (over-voltage) protectionProtectionDIY checks
PLDC bus low voltage (under-voltage) protectionProtectionDIY checks
LcCompressor start failureProtectionTechnician
LdCompressor phase loss or phase sequence errorProtectionTechnician
LECompressor stall (locked rotor)ProtectionTechnician
LPIndoor and outdoor unit mismatchFaultDIY checks
oEOutdoor unit fault (see outdoor board)FaultTechnician
U5Whole-unit current detection errorFaultTechnician
F7Oil return cycle (cooling)StatusDIY
LAOutdoor DC fan motor errorFaultDIY checks
LFCompressor over-speed protectionProtectionTechnician
P0IPM reset (drive module restarted)ProtectionTechnician
P5Compressor current protectionProtectionTechnician
P6Communication error between inverter drive and main controllerFaultTechnician
P7Inverter heat sink temperature sensor errorFaultDIY checks
P8Inverter heat sink (radiator) overheat protectionProtectionDIY checks
P9AC contactor protectionProtectionTechnician
PcCurrent sensor errorFaultTechnician
PdSensor connection protectionFaultTechnician
PETemperature drift protectionProtectionTechnician
PFDrive board ambient temperature sensor errorFaultDIY checks
PAAC current protectionProtectionDIY checks
PUCharging circuit errorFaultTechnician
PPAC input voltage anomalyProtectionDIY checks

How York shows error codes

The code shows on the indoor unit's display in place of the temperature. If the display is off, press the Light button on the remote. Some models also count out the code as indicator blinks. E codes are system protections and faults, F codes are mostly sensor faults, H codes are outdoor and compressor protections, U codes are motor and valve faults, and P codes are power-supply faults.

Brands built on the same platform

These brands share a code table with York because the same factory builds them, so their pages describe the same faults: Arcoaire, Blueridge, Comfortmaker, Cooper & Hunter, Day & Night, Friedrich, Gree, Heil, KeepRite, Rheem, Ruud, Tempstar, Tosot.

Sources

  • York M-Series Inverter-Driven Air Conditioning Units Service Manual (DHM18-42CMB21S), Troubleshooting error code tables

Updated September 2026. Manufacturer site: www.york.com/residential-equipment/ductless-systems