The unit has onboard diagnostics. Error codes will appear on the LED display on the front panel of the indoor unit in place of the temperature display. Error codes are also displayed on the outdoor unit microprocessor board with colored LED lights. The tables explain the error codes for the specific models.
UNITS 9K & 12K, 115 Volts
E2-Stop for anti−freeze protection of indoor −unit
E4-Stop for discharge temp protection
E5-Stop for low voltage protection
E6-Stop for communication malfunction
H3-Stop for compressor overload protection
H4-Overload protection
H5-Stop for IPM module protection
H6-DC motor (indoor unit) does not operate
F1-Indoor ambient temperature sensor malfunction
F2-Indoor tube temperature sensor malfunction
F3-Outdoor ambient temperature sensor malfunction
F4-Outdoor tube temperature sensor malfunction
F5-Outdoor discharge temperature sensor malfunction
H1-Automatic defrosting
UNIT 12K, 230 Volts
E2-Stop for anti−freeze protection of indoor −unit
E4-Stop for discharge temp protection
E5-Overcurrent protection
E6-Stop for communication error
H3-Stop for compressor overload protection
H4-Overload protection
H5-Stop for IPM module protection
H6-Indoor unit fan motor does not operate
F1-Indoor ambient temperature sensor malfunction
F2-Indoor tube temperature sensor malfunction
F3-Outdoor ambient temperature sensor malfunction
F4-Outdoor tube temperature sensor malfunction
F5-Outdoor discharge temperature sensor malfunction
C5-Jumper connection malfunction protection
LP-Unit match protection
U8-Indoor fan speed detection circuit malfunction
HC-PFC overcurrent malfunction
L9-High power protection
PL-Low voltage protection
H1-Automatic defrosting
UNIT 18K & 24K, 230 Volts
E1-System High Pressure protection
E2-Anti−freezing protection
E4-Compressor discharge high temp protection
E5-AC overload protection
E6-Indoor/Outdoor communication malfunction
E8-Anti−High temp protection
H6-Indoor unit fan motor no feedback
C5-Jumper connection malfunction protection
F1-Indoor ambient temperature sensor malfunction
F2-Indoor evaporator sensor open circuit/short circuit
F3-Outdoor ambient sensor open circuit/short circuit
F4-Outdoor condenser sensor open circuit/short circuit
F5-Compressor discharge temp sensor open circuit/short circuit
UNIT 18K & 24K, 230 Volts (Cont.)
F6-Overload limit, compressor speed reduction
F8-Over current compressor speed reduction
F9-Compressor discharge temp high, compressor speed reduction
PH-DC voltage is too high
U9-System current too high
P5-Compressor current too high
H1-Defrost
H3-Compressor overloa protection
H4-System overload protection
H5-IPM protection
Day and Night Air Conditioner Error Codes
