Toshiba RAV-M242A, Service Manual

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Block display

Check

code

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)

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.

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.

System

No reaction on remote
control operation

The outdoor fan does
not rotate

Check

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.

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.

Remote control is
not possible.

Remote control is
possible.

(1)  Judgement from defective operation or abnormal operation

Table 7-3

Self-diagnosis

Check

code

Power failure (When power is on)

—

Temperature sensor (T

A

) short/break

Heat exchanger sensor (T

C

) short/break

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 7-2