Troubleshooting Chart; Troubleshooting Procedure; Basic Check Items - Toshiba RAS-24UKX Service Manual

9-1. Troubleshooting Procedure:

Follow the details of 9-2. Basic Check Items.
If there is no trouble corresponding to 9-2, check
whether or not there are faulty parts following 9-4. Self-
Diagnosis by Remote Control.

9-2. Basic Check Items

9-2.1 Power supply voltage
The line voltage must be AC 220 – 240V. If it is not
within this rage, the air conditioner may not operate
normally.
No. Operation of Air Conditioner
1 When the main power supply is turned
on, the OPERATION lamp on the
indoor unit blinks.
2 The indoor fan motor speed does not
change in the Dry operation.
3 The compressor is not turned off even
though the room temperature is in the
range that the compressor is turned off.
4 The compressor is not turned on and
off even though the thermo control is
operated in the Dry operation.
5 The compressor is not turned on even
though the room temperature is in the
range that the compressor is turned on.
6 The operation mode changes in the
Automatic operation.
7 The Fan only operation continues in
the Automatic operation.
8 The ECONO. operation operation does
not work.

9. TROUBLESHOOTING CHART

9-2-2. Incorrect cable connection between indoor
The indoor unit is connected to the outdoor unit with 4
cables. Check that the indoor and outdoor units have
been properly connected with terminals assigned the
same numbers. If the connectors are not properly
connected, the outdoor unit will not operate normally,
or OPERATION lamp and TIMER lamp will blink (5Hz).
9-2-3. Program control
The microcomputer operates as shown in Table 9-2-1
to control the air conditioner. If there are any opera-
tional problems, check whether or not the problems
correspond to Table 9-2-1. If they correspond to the
Table, they are not problems with the air conditioner,
but they are indispensable operations to control and
maintain the air conditioner properly.
Table 9-2-1
The OPERATION lamp blinks to indicate that power is
turned on. If the [START/STOP] button is pressed, the lamp
stops blinking. The lamp also blinks when the power supply
is turned off.
The indoor fan motor speed is automatically controlled in
the Dry operation.
The compressor has a function that it is not turned off for
3 minutes after it is turned on even though the room
temperature is in the range that the compressor is turned
off.
In the Dry operation, the compressor is turned on and off
automatically at the regular intervals, independent of the
thermo control.
The compressor is not turned on in the restart delay timer
(3-minutes timer) operation. It is also not turned on after the
power supply is turned on because of this timer operation.
In Automatic operation, the room temperature is detacted
every 15 minutes and the operation mode is changed
according to difference between the room temperature and
the preset temperature.
When the room temperature is in the range (Preset
temperature ± 1°C), the Fan only operation is selected.
These operations do not work when the unit is in the Dry
operation or Fan only operation.
– 37 –
FILE NO. SVM-01010
and outdoor units
Descriptions