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10.Service Diagnosis
10.2 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
Equipment
operates but
does not cool, or
does not heat
(only for heat
pump)
Diagnosis by service port
pressure and operating
Large operating
noise and
Check the installation
vibrations
10.3 Error Codes and Description indoor display
displaying
panel code
indication
Indoor and
Outdoor
C
h
e
c
k
I
e t
m
of the electronic
expansion valve.
current.
condition.
Code indication
Indoor
Outdoor
(LED1 flash
times)
E7
15
E1
--
D
t e
i a
s l
f o
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
fault description
Communication fault between indoor and
outdoor units
Room temperature sensor failure
34
Service diagnosis
M
e
a
s
u
e r
operation.
provided.
Domestic Air Conditioner
Reference
Page
Page42
Pag
e
3
4
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