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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.
10.2 Problem Symptoms and Measures
Symptom
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
Check
noise
and
condition.
vibrations
Check Item
of the electronic
expansion valve.
individual units.
current.
the
installation
Details of Measure
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
Check for insufficient gas.
Check to make sure that the required spaces for
installation (specified in the Technical Guide, etc.) are
provided.
26
Service diagnosis
operation.
Domestic air conditioner
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