5. Troubleshooting
5-1 Items to be checked first
1)Is the voltage of the power correct? The input voltage shall be 198-264VAC.
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 5 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.
NO |
Operation of air conditioner |
Explanation |
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1 |
The COOL 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 first time. |
ON/OFF button on the remote control unit is pushed. |
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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 reoper- |
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operate at a room temperature higher than the setting |
ated. The same phenomenon occurs when a power is on. |
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temperature that the IN DOOR FAN should operate. |
As a phenomenon that the compressor is reoperated after a delay of |
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In a HEAT operation mode, the compressor does not |
3 minutes, the indoor fan is adjusted automatically with reference |
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operate at a room temperature lower than the setting |
to a temperature of the air blew |
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temperature that |
indoor fan should |
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operate. |
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3 |
Fan speed setting is not allowed in AUTO or DRY mode. |
The speed of the indoor fan is set to LL in DRY mode. |
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Fan speed is 5 steps is selected automatically in AUTO mode. |
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4 |
Compressor stops operation intermittently in DRY mode. |
Compressor operation is controlled automatically in DRY mode |
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depending on the room temperature and humidity. |
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5 |
Compressor of the outdoor unit is operating although it is |
When the unit is turned off while de-ice is activated, the compressor |
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turned off in a HEAT mode. |
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continues operation for up to 9 minutes (maximum) until the deice is |
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completed. |
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6 |
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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7 |
The compressor and indoor fan stop intermittently in HEAT |
The compressor and indoor fan stop intermittently if room temperature |
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mode. |
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exceeds a setting temperature in order to protect the compressor from |
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overheated air in a HEAT mode. |
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8 |
Indoor fan and outdoor fan stop operation intermittently in |
The compressor operates in a reverse cycle to remove exterior ice in a |
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a HEAT mode. |
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HEAT mode, and indoor fan and outdoor fan do not operate intermit- |
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tently for within 20% of the total heater operation |
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9 |
The compressor stops intermittently in a COOL mode or DRY |
The compressor stops intermittently or the fan speed of the indoor unit |
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mode, and fan speed of the indoor unit decreases. |
decreases to prevent inside/outside air frozen depending on the |
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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 blinking (1Hz) |
Restore from power failure (input initial power) |
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2 |
TIMER LED blinking (1Hz) |
Indoor unit Room sensor Error (open or short) |
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3 |
OPERATING and TIMER LED blinking (1Hz) |
Indoor unit heat exchanger temperature sensor Error (open or short) |
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4 |
FAN LEA blinking (1Hz) |
Indoor fan malfunctioning (for spead is Below 38Orpm) |
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Samsung Electronics |
5-1 |
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? (11VDC-12.5VDC)
(5)Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
Remove power cord and plug in again in approx. 5 seconds
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NO |
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YES |
Is DC voltage of PCB |
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display normal? |
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NO |
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Replace |
Is 198~264VAC |
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applied to the |
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PCB display |
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primary |
side of the |
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power transformer? |
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NO |
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NO |
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•Check linkage |
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between |
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power cord and |
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terminal tap |
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•Check fuse |
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Is 14~18VAC appear in |
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the secondary side of the |
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power transformer? |
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NO |
YES |
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Replace power transformer
NO
Replace resonator (X501)
Is operation normal?
NO
YES
OK
Is operation lamp blinking? |
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YES |
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Does operation start when |
YES |
run/stop button on the remote |
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controller unit pushed? |
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NO |
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Is transmission display of the |
NO |
remote controller unit blinking? |
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YES |
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Is "beep"sound heard from the |
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main unit? |
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YES |
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Is DC voltage of the PCB |
NO |
module normal? |
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YES |
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Are voltages of #62 (compressor), |
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#60(4 way valve) and #61 (outdoor |
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fan) of the micom normal? 5VDC |
YES |
Is voltage of #63 (indoor fan) of the |
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micom normal? |
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DC5V |
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10ms |
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NO |
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Is voltage at #32 terminal of the Micom normal? |
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0VDC |
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Is voltage at #64 terminal of the Micom normal? |
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5VDC |
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YES NO
Is voltage at #25 terminal of the micom normal?
10ms
YES NO
Are voltage at #30 and #31 of the micom normal?
100ns
YES
Replace
micom
Normal
Refer to remote control unit fault diagnosis
Replace PCB
module.
Are voltages at RY71(Compressor) RY73(4-way valve) and SY72(outdoor fan)
normal? DC12V
Is voltage at SS71(indoor fan)
YES |
NO |
Check connec- |
Replace |
tions compressor |
RY71, |
4-way valve, out- |
RY73, |
door fan and |
RY72 and |
indoor fan. |
SS71 |
Is output voltage of ICO2 normal?
YES |
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NO |
Check PCB pattern. |
Replace |
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Replace main PCB. |
ICO2 |
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Is voltage output |
terminal of |
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D101~D105(IN4007) normal? |
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YES |
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NO |
OK |
Replace IN4007 |
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5-2 |
Samsung Electronics |
Troubleshooting
5-2-2 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)
1)Checklist :
(1)Is the indoor unit fan motor properly connected with the connector (CN73)?
(2)Is the AC voltage correct?
(3)Is HALL IC in indoor fan motor properly connected with the connector (CN43)?
(4)Is the running capacitor properly connected with the terminal?
2)Troubleshooting procedure
After unplugging out the power cord should be reconnected within five seconds.
YES
Does the operating lamp(Green) blink?
YES
Does the Solid State Relay(SS71) work properly?
Test rod location
Normal
Voltage
+-
SS71- |
SS71- |
12V |
YES
NO |
Check as in the procedur “NO power parts” |
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Refer tp page 5-2. |
NO
Microcomputer is out of order.
Is the supply voltage of the fan |
NO |
PCB is |
PCB should |
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motor sufficient? |
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out of order. |
be replaced. |
Test rod location |
Normal |
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PCB CN73 |
Condition |
voltage |
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Fan operate |
AC 180V |
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YES |
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MF-C is out of order |
Replace MFC |
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Fan motor |
Fan motor |
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should be |
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is out of order. |
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replaced. |
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Samsung Electronics |
5-3 |
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