Service 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.
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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.
Domestic air conditioner
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