Connector Wiring Diagram
Domestic Air Conditioner
44
10.3 Problem Symptoms and Measures
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None of the units
operates
Check the power supply.
Check to make sure that the rated voltage is supplied.
Check the indoor PCB
Check to make sure that the indoor PCB is broken
Operation
sometimes stops.
Check the power supply.
A power failure of 2 to 10 cycles can stop air conditioner
operation.
Equipment
operates but
does not cool, or
does not heat
(only for heat
pump)
Check for faulty operation
of the electronic
expansion valve.
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.
Diagnosis by service port
pressure and operating
current.
Check for insufficient gas.
Large operating
noise and
vibrations
Check the installation
condition.
Check to make sure that the required spaces for
installation (specified in the Technical Guide, etc.) are
provided.
10.4 Error Codes and Description indoor display
Code indication
fault description
Reference
Page
Indoor
displaying
panel code
indication
Outdoor
(LED1 flash
times)
Indoor and
Outdoor
E7 15
Communication fault between indoor and
outdoor units
Page 56
Indoor Malfunction
E1
--
Room temperature sensor failure
Page 46
E2
--
Heat-exchange sensor failure
Page 46
47
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E14
--
Indoor fan motor malfunction
Page 48
Outdoor
Malfunction
47
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F1
2
51
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F22
3
Overcurrent protection of AC electricity
for the outdoor model
Page 52
F3 4
Communication fault between the IPM and
outdoor PCB
Page53
F19
6
Power voltage is too high or low
Page 54
F4 8
Overheat protection for Discharge
temperature
Page 55
