Diagnosis
Abnormality /
display
Protection control
Abnormal wiring or
H41
piping connection
ECONAVI sensor
H59
abnormality
Outdoor high
H64
pressure sensor
abnormality
H67
Nanoe abnormality
Light sensor
H70
abnormality
Abnormal
communication
H85
between indoor &
wireless LAN module
Outdoor fan motor
H97
mechanism lock
Indoor high pressure
H98
protection
Indoor operating unit
H99
freeze protection
4-way valve
F11
switching
abnormality
Indoor standby units
F17
freezing abnormality
Power factor
correction
F90
(PFC) circuit
protection
Refrigeration cycle
F91
abnormality
Compressor
F93
abnormal revolution
Compressor
F94
discharge overshoot
protection
Outdoor cooling high
F95
pressure protection
Power transistor
F96
module overheating
protection
Compressor
F97
overheating
protection
Total running current
F98
protection
Outdoor direct
F99
current (DC) peak
detection
Abnormality
Protection
Judgment
Operation
—
Continuous for 25s
Continuous for 1
minutes
Nanoe stop for 5
minutes for 3 times
Continuous for 24
hours, 15days
Communication error
for 10 minutes for 3
times
2 times happen
within 30 minutes
—
—
4 times happen
within 30 minutes
3 times happen
within 40 minutes
4 times happen
within 10 minutes
2 times happen
within 20 minutes
4 times happen
within 20 minutes
4 times happen
within 30 minutes
4 times happen
within 20 minutes
4 times happen
within 30 minutes
3 times happen
within 30 minutes
3 times happen
within 20 minutes
Continuous
happen for 7 times
Problem
Wrong wiring and
—
connecting pipe, expansion
valve abnormality
ECONAVI sensor open or
—
short circuit
High pressure sensor open
—
circuit during compressor
stop
—
Nanoe faulty
Light sensor open or
—
short circuit
Wireless LAN LED Off or
—
timer LED blinking
Outdoor fan motor lock or
—
feedback abnormal
Indoor high pressure
—
protection (Heating)
Indoor freeze protection
—
(Cooling)
4-way valve switching
—
abnormal
Wrong wiring and
connecting pipe, expansion
—
valve leakage, indoor heat
exchanger sensor open
circuit
Power factor correction
—
circuit abnormal
Refrigeration cycle
—
abnormal
Compressor abnormal
—
revolution
Compressor discharge
—
pressure overshoot
Cooling high pressure
—
protection
Power transistor module
—
overheat
—
Compressor overheat
—
Total current protection
Power transistor module
—
current protection
84
Check location
Check indoor/outdoor
connection wire and connection
pipe
Expansion valve and lead wire
and connector
ECONAVI sensor (defective or
disconnected)
ECONAVI PCB
High pressure sensor
Lead wire and connector
PCB
Nanoe system
High voltage
Light sensor (defective or
disconnected)
Network adaptor
Router
Network coverage
Outdoor fan motor lead wire
and connector
Fan motor lock or block
Check indoor heat exchanger
Air filter dirty
Air circulation short circuit
Check indoor heat exchanger
Air filter dirty
Air circulation short circuit
4-way valve
Lead wire and connector
Check indoor/outdoor
connection wire and pipe
Indoor heat exchanger sensor
lead wire and connector
Expansion valve lead wire and
connector
Outdoor PCB faulty
Insufficient refrigerant or valve
close
Power transistor module faulty
or compressor lock
Check refrigeration system
Check refrigeration system
Outdoor air circuit
PCB faulty
Outdoor air circuit (fan motor)
Insufficient refrigerant
Check refrigeration system
Power source or compressor
lock
Power transistor module faulty
or compressor lock