Panasonic CU-4E24RBU - 15 Troubleshooting Guide; Self Diagnosis Function

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15. Troubleshooting Guide
15.1 Self Diagnosis Function
 The display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printed
circuit board in the outdoor unit can be used to identify the location of the problem.
Refer to the table below to identify and solve the cause of the problem, and then re-start the air conditioner
system.
 If the problem is solved and operation returns to normal.
LED 1 illuminates and others LED are off.
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
H11
Indoor/outdoor
abnormal
communication
O
After operation
for 1 minute
Indoor fan only
operation can start
by entering into
force cooling
operation
Indoor/outdoor
communication not
establish
 Indoor/outdoor
wire terminal
 Indoor/outdoor
PCB
 Indoor/outdoor
connection wire
H12
Indoor unit
capacity
unmatched
O
90s after
power supply
-
Total indoor capability
more than maximum
limit or less than
minimum limit, or
number of indoor unit
less than two
 Indoor/outdoor
connection wire
 Indoor/outdoor
PCB
 Specification and
combination table
in catalogue
H15
Compressor
temperature
sensor
abnormality
O O
Continuous for
5s
-
Compressor
temperature sensor
open or short circuit
 Compressor
temperature
sensor lead wire
and connector
H16
Outdoor
current
transformer
(CT)
abnormality
O O - -
Current transformer
faulty or compressor
faulty
 Outdoor PCB
faulty or
compressor faulty
H27
Outdoor air
temperature
sensor
abnormality
O O
Continuous for
5s
-
Outdoor air
temperature sensor
open or short circuit
 Outdoor air
temperature
sensor lead wire
and connector
H28
Outdoor heat
exchanger
temperature
sensor 1
abnormality
O O O
Continuous for
5s
-
Outdoor heat
exchanger temperature
sensor 1 open or short
circuit
 Outdoor heat
exchanger
temperature
sensor 1 lead
wire and
connector
H32
Outdoor heat
exchanger
temperature
sensor 2
abnormality
O
Continuous for
5s
-
Outdoor heat
exchanger temperature
sensor 2 open or short
circuit
 Outdoor heat
exchanger
temperature
sensor 2 lead
wire and
connector
H33
Indoor/outdoor
misconnection
abnormality
O O - -
Indoor and outdoor
rated voltage different
 Indoor and
outdoor units
check
H36
Outdoor gas
pipe
temperature
sensor
abnormality
O O
Continuous for
5s
Heating protection
operation only
Outdoor gas pipe
temperature sensor
open and short circuit
 Outdoor gas pipe
temperature
sensor lead wire
and connector
H37
Outdoor liquid
pipe
temperature
sensor
abnormality
O O O
Continuous for
5s
Cooling protection
operation only
Outdoor liquid pipe
temperature sensor
open or short circuit
 Outdoor liquid
pipe temperature
sensor lead wire
and connector
H64
Outdoor high
pressure
sensor
abnormality
O O
Continuous for
1 minute
-
High pressure sensor
open circuit during
compressor stop
 High pressure
sensor
 Lead wire and
connector
H97
Outdoor fan
motor
mechanism
lock
O O O
2 times
happen within
30 minutes
-
Outdoor fan motor lock
or feedback
 Outdoor fan
motor lead wire
and connector
 Fan motor lock or
block
H98
Indoor high
pressure
protection
O O O - -
Indoor high pressure
protection (Heating)
 Check indoor
heat exchanger
 Air filter dirty
 Air circulation
short circuit