Samsung UQ12AABMC, Service Manual

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3. Troubleshooting
3-1 Items to be checked first
1) The input voltage should be rating voltage
±
10% range.
The airconditioner may not operate properly if the voltage is out of this range.
2) Is the link cable linking the indoor unit and the outdoor unit linked properly?
The indoor unit and the outdoor unit shall be linked by 6 cables.
Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of
cables.
Otherwise the airconditioner may not operate properly.
3) When a problem occurs due to the contents illustrated in the table below it is a symptom not related to
the malfunction of the airconditioner.
4) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis
details on the display panel.
NO Operation of air conditioner
1 The STD operation indication LED blinks when a
power plug of the indoor unit is plugged in for the first time.
2 In a COOL operation mode, the compressor does not
operate at a room temperature higher than the setting
temperature that the INDOOR FAN should operate.
In a HEAT operation mode, the compressor does not
operate at a room temperature lower than the setting
temperature that indoor fan should operate.
3 Fan speed setting is not allowed in AUTO or DRY mode.
4 Compressor stops operation intermittently in DRY mode.
5 Compressor of the outdoor unit is operating although it is
turned off in a HEAT mode.
6 Timer LED only of the indoor unit lights up and the
air conditioner does not operate.
7 The compressor and indoor fan stop intermittently in HEAT
mode.
8 Indoor fan and outdoor fan stop operation intermittently in
a HEAT mode.
9 The compressor stops intermittently in a COOL mode or DRY
mode, and fan speed of the indoor unit decreases.
It indicates power is on. The LED stops blinking if the operation
ON/OFF button on the remote control unit is pushed.
In happens after a delay of 3 minutes when the compressor is reop-
erated. The same phenomenon occurs when a power is on.
As a phenomenon that the compressor is reoperated after a delay of
3 minutes, the indoor fan is adjusted automatically with reference
to a temperature of the air blew.
The speed of the indoor fan is set to LL in DRY mode.
Fan speed is 5 steps is selected automatically in AUTO mode.
Compressor operation is controlled automatically in DRY mode
depending on the room temperature and humidity.
When the unit is turned off while de-ice is activated, the compressor
continues operation for up to 9 minutes (maximum) until the deice is
completed.
Timer is being activated and the unit is in ready mode.
The unit operates normally if the timer operation is cancelled.
The compressor and indoor fan stop intermittently if room tempera-
ture exceeds a setting temperature in order to protect the compres-
sor from overheated air in a HEAT mode.
The compressor operates in a reverse cycle to remove exterior ice in
a HEAT mode, and indoor fan and outdoor fan do not operate inter-
mittently for within 20% of the total heater operation
The compressor stops intermittently or the fan speed of the indoor
unit decreases to prevent inside/outside air frozen depending on the
inside/outside air temperature.
Explanation
NO
Display
1 STD LED blinking (1Hz)
2 TIMER LED blinking (1Hz)
3 STD and TIMER LED blinking (1Hz)
4 NATURE LED blinking (1Hz)
Restore from power failure (input initial power)
Indoor unit Room sensor Error (open or short)
Indoor unit heat exchanger temperature sensor Error (open or short)
Indoor fan malfunctioning (for spead is Below 450rpm)
Self Diagnosis
DB98-05496A(1)-1 3/21/02 4:33 PM Page 7