Panasonic CU-4E24RBU - Page 54

54
Diagnosis
display
Abnormality
or
protection
control
LED 6 LED 5 LED 4 LED 3 LED 2 LED 1
A
bnormality
judgment
Protection
operation
Problem Check location
H99
Indoor
operating unit
freeze
protection
O O O - -
Indoor freeze
protection (Cooling)
 Check indoor
heat exchanger
 Air filter dirty
 Air circulation
short circuit
F11
4-way valve
switching
abnormality
O O O O
4 times
happen within
30 minutes
-
4-way valve switching
abnormal
 4-way valve
 Lead wire and
connector
F17
Indoor standby
units freezing
abnormality
O
3 times
happen within
40 minutes
-
Wrong wiring and
connecting pipe,
expansion valve
leakage
 Check
indoor/outdoor
connection wire
and pipe
 Indoor heat
exchanger sensor
lead wire and
connector
 Expansion valve
lead wire and
connector
F90
Power factor
correction
(PFC) circuit
protection
O O
4 times
happen within
20 minutes
-
Power factor correction
circuit abnormal
 Outdoor PCB
faulty
F91
Refrigeration
cycle
abnormality
O O
4 times
happen within
60 minutes
-
Refrigeration cycle
abnormal
 Insufficient
refrigerant or
valve close
F93
Compressor
abnormal
revolution
O O O
4 times
happen within
20 minutes
-
Compressor abnormal
revolution
 Power transistor
module faulty or
compressor lock
F94
Compressor
discharge
pressure
overshoot
protection
O O
4 times
happen within
30 minutes
-
Compressor discharge
pressure overshoot
 Check
refrigeration
system
F95
Outdoor
cooling high
pressure
protection
O O O
4 times
happen within
20 minutes
-
Cooling high pressure
protection
 Check
refrigeration
system
 Outdoor air circuit
F96
Power
transistor
module
overheating
protection
O O O
4 times
happen within
30 minutes
-
Power transistor
module overheat
 PCB faulty
 Outdoor air circuit
(fan motor)
F97
Compressor
overheating
protection
O O O O
3 times
happen within
30 minutes
- Compressor overheat
 Insufficient
refrigerant
F98
Total running
current
protection
O O
3 times
happen within
20 minutes
- Total current protection
 Check
refrigeration
system
 Power source or
compressor lock
F99
Outdoor direct
current (DC)
peak detection
O O O
Continuous
happen for
7 times
-
Power transistor
module current
protection
 Power transistor
module faulty or
compressor lock
LED 1 illuminate is indicated that outdoor unit is operating normally. If the LED 1 is switched off or flashing, check the
power supply and self-diagnosis indication.
● - - - - - - Illuminate
○ - - - - - - Flashing
Blank - - - - - - OFF