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FILE NO. SVM-07023
9-3. Primary Judgement
9-3-1. Role of indoor unit controller
The indoor unit controller receives the operation
commands from the remote control and executes
them.
•Temperature measurement at the air outlet of the
indoor heat exchanger by the indoor temperature
sensor
•Temperature setting of the indoor heat exchanger by
the heat exchanger sensor
•Louver motor control
•Indoor fan motor operation control
•LED display control
•Transferring of operation commands to the outdoor
unit
9-3-2. Failure diagnosis
The indoor unit diagnoses the operation condition and
indicates the information of the self-diagnosis with the
lamps on the display panel of the indoor unit.
Table 9-3-1
Lamps Self-diagnosis
A OPERATION lamp is blinking. (1Hz)
B OPERATION lamp is blinking. (5Hz)
C OPERATION lamp is blinking. (5Hz)
D OPERATION lamp is blinking. (5Hz)
E OPERATION lamp is blinking. (5Hz)
F OPERATION and TIMER lamps are blinking.
(5Hz)
G OPERATION and TIMER lamps are blinking.
Table 9-3-2 Diagnosis by detective operation
The remote control
does not work.
The outdoor fan
does not rotate.
Turn off the power supply once,
then turn it on. Try to operate
the remote control.
The compressor operates.
The compressor does not operate.
The remote control
still does not work.
The remote control
works.
The indoor unit (and/or remote
control) is/are defective.
OK.
The outdoor unit (Outdoor fan
motor) is defective.
An internal part of the
compressor or PCB is defective.
Symptom Check Primary judgement
Power failure (when the power supply is turning on)
Thermo sensor (TA) short or break
Heat exchanger sensor (TC) short or break
Indoor fan motor lock or failure
Indoor P.C. board failure
Wrong wiring of connecting cable
Cycle failure
•Gas shortage or other refrigerant cycle trouble
•Heat exchanger sensor open, break or short
•Overload relay or thermostat trouble of compressor
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