Troubleshooting Chart; Troubleshooting Procedure; Basic Check Items - Toshiba RAS-13UKHP-E 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 range, the air conditioner may not operate
normally.
No. Operation of Air Conditioner
When the main power supply is turned on,
1 the OPERATION lamp on the indoor unit
blinks.
The indoor fan motor speed does not
2
change in the Dry operation.
The compressor is not turned off even
3 though the room temperature is in the range
that the compressor is turned off.
The compressor is not turned on and off
4 even though the thermo control is
operated in the Dry operation.
The PRE-DEF. lamp is indicated when the
Heating operation starts.
5
The outdoor fan motor stops in the Heating
6
operation.
The compressor is not turned on even
7 though the room temperature is in the range
that the compressor is turned on.
The operation mode changes in the
Automatic operation.
8
The Fan only operation continues in the
9
Automatic operation.
The Hi-POWER operation does not work.
10

9. TROUBLESHOOTING CHART

9-2-2. Incorrect Cable Connection between Indoor
The indoor unit is connected to the outdoor unit with 5
cables (Heating and Cooling model) or 3 cables (Cooling
Only model). Check that the indoor and outdoor units
have been properly connected with terminals assigned
the same numbers. If the connec- tors 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 PRE-DEF. lamp is indicated during the Defrosting
operation or if the indoor heat exchanger temperature is low
when the Heating operation starts. At this time, the indoor fan
motor stops to prevent cold air from blowing in the room.
When the indoor heat exchanger temperature is high, the outdoor
fan motor is stopped by the high-temperature limit control operation.
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 detected 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.
This operation does not work when the unit is in the Dry operation
or Fan only operation.
– 48 –
FILE NO. SVM-02001
and Outdoor Units
Descriptions