47
Diagnosis
display
Abnormality / Protection
control
Abnormality
Judgment
Protection
Operation
Problem
Check location
H70
Light sensor abnormality
Continuous for
24 hours, 15 days
—
Light sensor open or short
circuit
Light sensor (defective or
disconnect)
H97
Outdoor fan motor
mechanism lock
2 times happen
within 30 minutes
—
Outdoor fan motor lock or
feedback abnormal
Outdoor fan motor lead wire
and connector
Fan motor lock or block
H98
Indoor high pressure
protection
—
—
Indoor high pressure
protection (Heating)
Check indoor heat exchanger
Air filter dirty
Air circulation short circuit
H99
Indoor operating unit freeze
protection
—
—
Indoor freeze protection
(Cooling)
Check indoor heat exchanger
Air filter dirty
Air circulation short circuit
F11
4-way valve switching
abnormality “*”
4 times happen
within 30 minutes
—
4-way valve switching
abnormal
4-way valve
Lead wire and connector
F17
Indoor standby units freezing
abnormality
3 times happen
within 40 minutes
—
Wrong wiring and
connecting pipe,
expansion valve leakage,
indoor heat exchanger
sensor open circuit
Check indoor/outdoor
connection wire and pipe
Indoor heat exchanger
sensor lead wire and
connector
Expansion valve lead wire
and connector
F90
System and compressor
microcomputer
communication error (for
S10*** only)
2 times happen
within 5 seconds
—
—
Compressor
Outdoor PCB
F90
Power factor correction (PFC)
circuit protection
4 times happen
within 10 minutes
—
Power factor correction
circuit abnormal
Outdoor PCB faulty
F91
Refrigeration cycle
abnormality
2 times happen
within 20 minutes
—
Refrigeration cycle
abnormal
Insufficient refrigerant or
valve close
F93
Compressor abnormal
revolution
4 times happen
within 20 minutes
—
Compressor abnormal
revolution
Power transistor module
faulty or compressor lock
F94
Compressor discharge
overshoot protection
4 times happen
within 30 minutes
—
Compressor discharge
pressure overshoot
Check refrigeration system
F95
Outdoor cooling high pressure
protection
4 times happen
within 20 minutes
—
Cooling high pressure
protection
Check refrigeration system
Outdoor air circuit
F96
Power transistor module
overheating protection
4 times happen
within 30 minutes
—
Power transistor module
overheat
PCB faulty
Outdoor air circuit (fan motor)
F97
Compressor overheating
protection
3 times happen
within 30 minutes
—
Compressor overheat
Insufficient refrigerant
F98
Total running current
protection
3 times happen
within 20 minutes
—
Total current protection
Check refrigeration system
Power source or compressor
lock
F99
Outdoor direct current (DC)
peak detection
Continuous happen
for 7 times
—
Power transistor module
current protection
Power transistor module
faulty or compressor lock
Note:
“ * ” – For cooling only model, it is the indication when indoor heat exchanger sensor or indoor air intake sensor has
abnormality.
The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep”
sound heard following by pressing the CHECK button at remote control.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors
(refer to Error Code Table) by using remote control or Auto OFF/ON button at indoor unit. However, the remote
control signal receiving sound is changed from one “beep” to four “beep” sounds.