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 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 |
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Explanation |
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1 |
The operation indication LED (Green) blinks when a |
It indicates power is on. The LED stops blinking if the operation |
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power plug of the indoor unit is plugged in for the |
ON/OFF button on the remote control unit is pushed. |
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first time. |
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2 |
• In a COOL operation mode, the compressor does not |
• In happens after a delay of 3 minutes when the compressor is |
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operate at a room temperature than the setting |
reoperated. The same phenomenon occurs when a power is on. |
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temperature that the compressor should operate. |
• As a phenomenon that the compressor is reoperated after a |
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delay of 3 minutes, the indoor fan is adjusted automatically |
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with reference to a temperature of the air blew |
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3 |
Fan speed setting is not allowed in AUTO |
or DRY |
• The speed of the indoor is changed automatically in DRY mode. |
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mode. |
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• Fan speed is 4 steps is selected automatically in AUTO mode. |
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4 |
Compressor stops operation intermittently in DRY |
Compressor operation is controlled automatically in DRY mode |
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mode. |
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depending on the room temperature. |
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5 |
Timer LED only of the indoor unit lights up and the |
Timer is being activated and the unit is in ready mode. |
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air conditioner does not operate. |
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The unit operates normally if the timer operation is cancelled. |
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6 |
The compressor stops intermittently in |
a COOL |
The compressor stops intermittently or the fan speed of the |
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mode or DRY mode, and fan speed of the indoor unit |
indoor unit decreases to prevent inside/outside air frozen |
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decreases. |
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depending on the inside/outside air temperature. |
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4)Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details on the display panel.
NO |
Display |
Self Diagnosis |
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1 |
OPERATING LED (GREEN) blinking (1Hz) |
Restore from power failure (input initial power) |
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2 |
TIMER LED (YELLOW) blinking (5Hz) |
Temperature sensor defective (open, short) |
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3 |
OPERATING (GREEN), TIMER LED (YELLOW) blinking (5Hz) |
Indoor heat exchanger sensor defective (open, short) |
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4 |
FAN (GREEN) LED blinking (5Hz) |
Indoor fan malfunction (inoperative within 15 secless than |
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600rpm) |
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Samsung Electronics |
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 correctly?
(3)Are connections between primary side, secondary side of the power transformer and PCB good.
(4)Is output voltage of DC regulator IC KA7812(IC01) normal? (11.5VDC-12.5VDC)
(5)Is output voltage of DC regulator IC KA7805(IC02) normal? (4.5VDC-5.5VDC)
2)Troubleshooting procedure
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
Check whether the display PCB is normal? (Check the DC 5V, DC12V, wire, etc.)
Y
Y
Normal
N
Replace the fuse (250V, 3.15A)
N
Replace the trans.
N
Replace the IC01.
N
Replace the IC02.
N
Harness check and replace
N
Replace the assembly display PCB
Replace the assembly main PCB.
5-2 |
Samsung Electronics |
Troubleshooting
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 soldered?
(4)Is HALL IC in indoor fan motor properly connected(CN43)?
(5)When in operation mode, does the indoor unit fan operate?
2) Troubleshooting procedure
Remove power cord and plug in again in approx. 5 seconds.
Y
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 |
Go to the item of "No power |
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parts" (Refer to page 5-2) |
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Y
No problem (Normal)
N |
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•Is a voltage of above AC 240~300V applied to both ends |
Y |
Is pin #63 of the micom (IC04) |
N |
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of theindoor fan connector (CN73)? |
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a square wave? |
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•Is pin #3 of the CN43 a square wave? |
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N |
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Y |
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Replace the indoor fan motor or fan motor capacitor. |
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Is pin #13 of the IC06 a square wave? |
N |
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Y |
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Replace the Q401 (KSC945Y). |
Y |
Is pin #24 of the micom (IC04) |
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a square wave? |
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N |
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Replace the micom (IC04).
Replace the IC06.
Replace the SS71 (G3MB202PL).
Samsung Electronics |
5-3 |
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