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10 Service Diagnosis
10.1 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.
1 .2 Problem Symptoms and Measures
S
y
m
p
o t
m
None of the units
operates
Operation
sometimes stops.
Equipment
operates but
does not cool, or
does not heat
(only for heat
pump)
Large operating
noise and
vibrations
10.3 Parameter of primary electronic appliance
N O
N a m e
ELECTRIC
EXPANSION
1
C
h
e
c
k
I
e t
m
Check the power supply.
Check the indoor PCB
Check the power supply.
Check for faulty operation
of the electronic
expansion valve.
Diagnosis by service port
pressure and operating
current.
Check the installation
condition.
P a ra m e te r
Rated voltage:12V
Valve orifice : Φ1.65mm
VALVE
Coil resistance 46±3.7
D
t e
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
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
30
i a
s l
f o
M
e
a
s
u
e r
operation.
provided.
P ic tu re
Domestic Air Conditioner
Service Diagnosis
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