Samsung AS180, AS180UE0K-AFR Troubleshooting
5. Troubleshooting
5-1 Items to be checked first
1) The input voltage should be 198-264VAC.
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 pro p e r l y.
3) If a problem occurs as described in the table below, it is a symptom not related to the malfunction of the air
c o n d i t i o n e r.
NO
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
temperature 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.
Operation of air conditioner
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.
4 ) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details
on the display panel.
NO Display
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)
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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)
Self Diagnosis
5-1
Troubleshooting
5-2 Fault Diagnosis by Symptom
5-2-1 No Power(completely dead)-Initial diagnosis
1 ) Checklist :
(1) Is input voltage normal? (198-264V~)
(2) Is AC power linked corre c t l y ?
(3) A re connections between primary side, secondary side of the power transformer
and PCB good.
(4) Is output voltage of DC regulator IC KA7812(IC01) normal? (11 . 5 V D C - 1 2 . 5 V D C )
(5) Is output voltage of DC regulator IC KA7805(IC02) normal? (4.5VDC-5.5VDC)
2 ) Troubleshooting pro c e d u re
Remove power cord and plug in again in approx. 5 seconds.
Is operating lamp lights on for
three minutes, and then goes off?
N
Check whether the fuse is normal? (F701)
Y
Check whether the output voltage of the trans
is normal? (AC 15V±3V)
Y
Check whether the DC 12V is normal?
(DC12±0.5V between "G" and "O" of the IC01)
Y
Check whether the DC 5V is normal?
(DC 5V±0.5V between "G" and "O" of the IC02)
Y
Is the harness properly connected(CN93, CN94)?
Y
Y
N
Replace the fuse (250V, 3.15A)
N
N
N
N
Harness check and replace
Normal
Replace the trans.
Replace the IC01.
Replace the IC02.
5-2
Check whether the display PCB is normal?
(Check the DC 5V, DC12V, wire, etc.)
Y
Replace the assembly main PCB.
N
Replace the assembly display PCB
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5-2-2 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)
1) Checklist :
(1) Is input voltage normal? (198-264V~)
(2) Is the indoor unit fan properly connected(CN73)?
(3) Is the starting codenser CR 71 properly soldere d ?
(4) Is HALL IC in indoor fan motor properly connected(CN43)?
(5) When in operation mode, does the indoor unit fan operate?
2 ) Troubleshooting pro c e d u re
Remove power cord and plug in again in approx. 5 seconds.
Y
Troubleshooting
Is operating lamp lights on for
three minutes, and then goes off?
Y
Check whether the indoor fan turns with the operation
lamp being turned on when the start/stop button of the
remote control is pressed?
N
•Is a voltage of above AC 240~300V applied to both ends
of theindoor fan connector (CN73)?
•Is pin #3 of the CN43 a square wave?
N
Replace the indoor fan motor or fan motor capacitor.
Replace the Q401 (KSC945Y).
Replace the micom (IC04).
N
Go to the item of "No power
parts" (Refer to page 5-2)
Y
Y
No problem (Normal)
Is pin #63 of the micom (IC04)
a square wave?
Y
Is pin #13 of the IC06 a square wave?
Y
Y
Is pin #24 of the micom (IC04)
a square wave?
N
N
N
Replace the SS71 (G3MB202PL).
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Replace the IC06.
5-3
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