Toshiba RAS-18SKHP-ES Service Manual page 50

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
A OPERATION lamp is blinking. (1 Hz)
B OPERATION lamp is blinking. (5 Hz)
C OPERATION lamp is blinking. (5 Hz)
D OPERATION lamp is blinking. (5 Hz)
E OPERATION lamp is blinking. (5 Hz)
F OPERATION and TIMER lamps are blinking.
(5 Hz)
G OPERATION, TIMER and PRE-DEF.
(or FAN ONLY for cooling only model) lamps
are blinking.
Symptom
The remote control Turn off the power supply once,
does not work. then turn it on. Try to operate
the remote control.
The outdoor fan The compressor operates.
does not rotate.
The compressor does not operate.
Table 9-3-1
Lamps
Table 9-3-2 Diagnosis by detective operation
Check
– 49 –
FILE NO. SVM-09036
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.
Self-diagnosis
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
The remote control The indoor unit (and/or remote
still does not work. control) is/are defective.
The remote control OK.
works.
The outdoor unit (Outdoor fan
motor) is defective.
An internal part of the
compressor or P.C. board is
defective.
Primary judgement