Troubleshooting Guide; Self Diagnosis Function - Panasonic CU-3E19RBU-5 Service Manual

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.
Abnormality
Diagnosis or
LED 6 LED 5 LED 4 LED 3 LED 2 LED 1
display protection
control
Indoor/outdoor
H11 abnormal
communication
Indoor unit
H12 capacity
unmatched
Compressor
temperature
H15
sensor
abnormality
Outdoor
current
H16 transformer
(CT)
abnormality
Outdoor air
temperature
H27
sensor
abnormality
Outdoor heat
exchanger
H28 temperature
sensor 1
abnormality
Outdoor heat
exchanger
H32 temperature
sensor 2
abnormality
Indoor/outdoor
H33 misconnection
abnormality
Outdoor gas
pipe
H36 temperature
sensor
abnormality
Outdoor liquid
pipe
H37 temperature
sensor
abnormality
Outdoor high
pressure
H64
sensor
abnormality
Outdoor fan
motor
H97
mechanism
lock
Indoor high
H98 pressure
protection
Abnormality
judgment
After operation
O
for 1 minute
90s after
O
power supply
Continuous for
O O
5s
O O
Continuous for
O O
5s
Continuous for
O O O
5s
Continuous for
O
5s
O O
Continuous for
O O
5s
Continuous for
O O O
5s
Continuous for
O O
1 minute
2 times
O O O happen within
30 minutes
O O O
63
Protection
operation
Indoor fan only
operation can start Indoor/outdoor
by entering into communication not
force cooling establish
operation
Total indoor capability
more than maximum
limit or less than
-
minimum limit, or
number of indoor unit
less than two
Compressor
- temperature sensor
open or short circuit
Current transformer
- - faulty or compressor
faulty
Outdoor air
- temperature sensor
open or short circuit
Outdoor heat
exchanger temperature
-
sensor 1 open or short
circuit
Outdoor heat
exchanger temperature
-
sensor 2 open or short
circuit
Indoor and outdoor
- -
rated voltage different
Outdoor gas pipe
Heating protection
temperature sensor
operation only
open and short circuit
Outdoor liquid pipe
Cooling protection
temperature sensor
operation only
open or short circuit
High pressure sensor
- open circuit during
compressor stop
Outdoor fan motor lock
-
or feedback
Indoor high pressure
- -
protection (Heating)
Problem Check location
 Indoor/outdoor
wire terminal
 Indoor/outdoor
PCB
 Indoor/outdoor
connection wire
 Indoor/outdoor
connection wire
 Indoor/outdoor
PCB
 Specification and
combination table
in catalogue
 Compressor
temperature
sensor lead wire
and connector
 Outdoor PCB
faulty or
compressor faulty
 Outdoor air
temperature
sensor lead wire
and connector
 Outdoor heat
exchanger
temperature
sensor 1 lead
wire and
connector
 Outdoor heat
exchanger
temperature
sensor 2 lead
wire and
connector
 Indoor and
outdoor units
check
 Outdoor gas pipe
temperature
sensor lead wire
and connector
 Outdoor liquid
pipe temperature
sensor lead wire
and connector
 High pressure
sensor
 Lead wire and
connector
 Outdoor fan
motor lead wire
and connector
 Fan motor lock or
block
 Check indoor
heat exchanger
 Air filter dirty
 Air circulation
short circuit