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Service Diagnosis
Domestic Air Conditioner
48
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7.1 Caution for Diagnosis
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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.
7.2 Problem Symptoms and Measures
Symptom Check Item Details of Measure
None of the units
is 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.
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Large operating noise
and vibrations
Check the installation condition.
Check to make sure that the required spaces for
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provided.
7.3 Error Codes and Description
Code indication
Description Outdoor LED1 blinks times
Indoor
Indoor
Malfunction
E1
Room temperature sensor failure --
E2
Heat-exchange sensor failure --
E4
Indoor EEPROM error --
E7
Communication error between the indoor and outdoor units 3 or 7
E14
Indoor fan motor malfunction --
Outdoor
Malfunction
F6
Outdoor Senistor Error
2
F7
Outdoor unit A’s coil sensor failure 5
F7
Outdoor unit B’s coil sensor failure 9
F12
Outdoor EEPROM error
1
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