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11 Service Diagnosis
11.1 Caution for Diagnosis
The operation lamp flashes when any of the following errors is detected.
1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions,
disabling equipment operation.
2. When a signal transmission error occurs between the indoor and outdoor units. In either case, conduct the
diagnostic procedure described in the following pages.
11.2 Parameter of primary electronic appliance
N O
N am e
1
F an m otor
11.3 Problem Symptoms and Measures
S
y
m
p
o t
m
Check the power supply.
None of the units
operates
Check the indoor PCB
Operation
Check the power supply.
sometimes stops.
Check for faulty operation
of the electronic
Equipment
operates but
expansion valve.
does not cool, or
does not heat
(only for heat
pump)
Diagnosis by service port
pressure and operating
current.
Large operating
noise and
Check the installation
vibrations
condition.
P aram eter
R ated voltage:220-230 V
R ated current:0 .2 A
R ated frequenc y:50 /60H z
C
h
e
c
k
I
e t
m
Check to make sure that the rated voltage is supplied.
Check to make sure that the indoor PCB is broken
A power failure of 2 to 10 cycles can stop air conditioner
operation.
Set the units to cooling operation, and compare the
temperatures of the liquid side connection pipes of the
connection section among rooms to check the opening and
closing operation of the electronic expansion valves of the
individual units.
Check for insufficient gas.
Check to make sure that the required spaces for
installation (specified in the Technical Guide, etc.) are
provided.
P icture
D
t e
i a
s l
34
Seivice diagnosis
f o
M
e
a
s
u
e r
Domestic air conditioner
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