Troubleshooting Guide; Self Diagnosis Function - Panasonic CU-4E23JBE 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.
Diagnosis Abnormality
display or
LED 6 LED 5 LED 4 LED 3 LED 2 LED 1
protection
control
H11 Indoor/outdoor
abnormal
communication
H12 Indoor unit
capacity
unmatched
H15 Compressor
temperature
sensor
abnormality
H16 Outdoor
current
transformer
(CT)
abnormality
H27 Outdoor air
temperature
sensor
abnormality
H28 Outdoor heat
exchanger
temperature
sensor 1
abnormality
H32 Outdoor heat
exchanger
temperature
sensor 2
abnormality
H33 Indoor /
outdoor
misconnection
abnormality
H36 Outdoor gas
pipe
temperature
sensor
abnormality
Abnormality Protection
judgement operation
After Indoor fan only
operation for operation can
1 minute start by
entering into
force cooling
operation
90s after —
power supply
Continuous —
for 5s
— —
Continuous —
for 5s
Continuous —
for 5s
Continuous —
for 5s
— —
Continuous Heating
for 5s protection
operation only
42
Problem Check location
Indoor/outdoor • Indoor/outdoor
communication not wire terminal
establish • Indoor/outdoor
PCB
• Indoor/outdoor
connection wire
Total indoor • Indoor/outdoor
capability more than connection wire
maximum limit or • Indoor/outdoor
less than minimum PCB
limit, or number of • Specification and
indoor unit less than combination table
two. in catalogue
Compressor • Compressor
temperature sensor temperature
open or short circuit sensor lead wire
and connector
Current transformer • Outdoor PCB
faulty or compressor faulty or
faulty compressor
faulty
Outdoor air • Outdoor air
temperature sensor temperature
open or short circuit sensor lead wire
and connector
Outdoor heat • Outdoor heat
exchanger exchanger
temperature sensor 1 temperature
open or short circuit sensor 1 lead
wire and
connector
Outdoor heat • Outdoor heat
exchanger exchanger
temperature sensor 2 temperature
open or short circuit sensor 2 lead
wire and
connector
Indoor and outdoor • Indoor and
rated voltage outdoor units
different check
Outdoor gas pipe • Outdoor gas pipe
temperature sensor temperature
open or short circuit sensor lead wire
and connector