Service Diagnosis - Haier 1U71SABFRA Service Manual

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1 .Service Diagnosis

1 .1.1 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 .1.2 Problem Symptoms and Measures
S
y
m
p
o t
m
Check the power supply.
None of the units
operates
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
vibrations
10.2 Parameter of primary electronic appliance
N O
N a m e
ELECTRIC
EXPANSION
1
VALVE
C
h
e
c
k
I
e t
m
Check the indoor PCB
of the electronic
expansion valve.
current.
Check the installation
condition.
P a ra m e te r
Rated voltage:12V
Valve orifice : Φ1.8mm
Coil resistance 46±3.7
D
t e
i a
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
P ic tu re
31
Connector Wiring Diagram
s l
f o
M
e
a
s
u
e r
operation.
provided.
Domestic Air Conditioner

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