Primary Judgement Of Trouble Sources - Toshiba RAV-M242A-E Service Manual

7-2. Primary Judgement of Trouble Sources

7-2-1. Role of Indoor Unit Controller
The indoor unit controller receives the operation
commands from the remote control and assumes
the following functions.
• Measurement of the draft air temperature of the
indoor heat exchanger by using the temperature
sensor (T ).
A
• Louver motor control
• Control of the indoor fan motor operation
• Control of the LED display
• Control of the outdoor unit compressor and the
outdoor fan motor.
Block display
OPERATION display blinking (1 Hz)
OPERATION display blinking (5 Hz)
OPERATION display blinking (5 Hz)
OPERATION display blinking (5 Hz)
OPERATION display blinking (5 Hz)
OPERATION and TIMER display
blinking (5 Hz)
OPERATION, TIMER and FAN ONLY
display blinking (5 Hz)
OPERATION, TIMER and FAN ONLY
display blinking (5 Hz)
(1) Judgement from defective operation or abnormal operation
System
No reaction on remote
control operation
The outdoor fan does
not rotate
Check
code
—
Turn off the power once, turn
it on again and try to operate
the remote control again.
The compressor operates.
The compressor does not operate.
7-2-2. Display of Abnormalities and
Judgement of the Abnormal Spots
The indoor unit of this machine observes the opera-
tion condition of the air conditioner and displays the
contents of the self-diagnosis as block displays on
the display panel of the indoor unit.
Table 7-2
Self-diagnosis
Power failure (When power is on)
Temperature sensor (T
Heat exchanger sensor (T
Indoor fan lock, abnormality of indoor fan, IC03,
D15 short/break
Indoor P .C. board failure
Thermal fuse is blown
(Indoor fan motor is overheat)
• Gas shortage, other refrigerant cycle trouble
• Heat exchanger sensor open/short/break
• Overload relay trouble
Compressor trouble
Table 7-3
Check
Remote control is
not possible.
Remote control is
possible.
– 11 –
) short/break
A
) short/break
C
Primary judgement
The indoor part (including the
remote control) is defective.
OK
The outdoor part is defective.
(outdoor fan motor)
The inside part is defective.
Check
code
—