Troubleshooting - Samsung AS-1808BR Service Manual

3. Troubleshooting

3-1 Items to be checked first
1) The input voltage should be rating Voltage ±10% range.
The air conditioner may not operate properly if the voltage is out of this range.
2) The indoor unit and the outdoor unit shall be linked by 4 cables.
Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of cables.
Otherwise the air conditioner may not operate properly.
3) If a problem occurs as described in the table below, it is a symptom not related to the malfunction of the air
conditioner.
NO Operation of air conditioner
1 The operation indication LED (Green) 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 than the setting tem-
perature that the compressor should operate.
3 Fan speed setting is not allowed in AUTO or DRY
mode.
4 Compressor stops operation intermittently in DRY
mode.
5 Timer LED only of the indoor unit lights up and the
air conditioner does not operate.
6 The compressor stops intermittently in a COOL mode
or DRY mode, and fan speed of the indoor unit
decreases.
4) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details
on the display panel.
NO
1 OPERATING LED (GREEN) blinking (1Hz)
2 TIMER LED (YELLOW) blinking (5Hz)
3 OPERATING (GREEN), TIMER LED (YELLOW) blinking (5Hz)
4 FAN (GREEN) LED blinking (5Hz)
Display
Explanation
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
reoperated. 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 is changed automatically in DRY mode.
• Fan speed is 4 steps is selected automatically in AUTO mode.
Compressor operation is controlled automatically in DRY mode
depending on the room temperature.
Timer is being activated and the unit is in ready mode.
The unit operates normally if the timer operation is cancelled.
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.
Self Diagnosis
Restore from power failure (input initial power)
Temperature sensor defective (open, short)
Indoor heat exchanger sensor defective (open, short)
Indoor fan malfunction (inoperative within 15 sec
- less than 600rpm)
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