SAMSUNG AQ07A1VE Service Manual Troubleshooting

5. Troubleshooting

5-1 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 pro p e r l y ?

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 pro p e r l y.

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 airc o n d i t i o n e r.

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 IN DOOR 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.

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 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 temperature exceeds a setting temperature in order to protect the compressor 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 intermittently 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.

4 ) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details

on the display panel.

NO Display

1 STD LED blinking (1Hz) 2 TIMER LED blinking (1Hz) 3 STD and TIMER LED blinking (1Hz) 4 NATURE LED blinking (1Hz)

Samsung Electronics

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

5-1

5-2 Fault Diagnosis by Symptom

5-2-1 No Power (completely dead)-Initial diagnosis

1) Checklist : (1) Is input voltage normal? (2) Is AC power linked corre c t l y ? (3) 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

YES

Replace PCB

display

Is DC voltage of PCB

display normal?

Is rating voltage ±10% range

applied to the primary side(~,~)

of the “BD71”

•Check linkage between power cord and

terminal tap

•Check fuse

Is 325VDC appear in the

secondary side (+, -)

of “BD71”

YESNO

Replace

SMPS PARTS

Replace resonator (X301)

Is operation normal?

YES

Is operation lamp blinking?

Does operation start when

ON/OFF button on the remote

controller unit pushed?

Is transmission display of the

remote controller unit blinking?

Is "beep"sound heard from the main

Is DC voltage of the PCB module

Are voltages of #8 (compressor),

#7(4 way valve) and #6 (outdoor fan)

Is voltage of #60 (indoor fan) of the DC5V

Is voltage at #50 terminal of the Micom normal? Is voltage at #18 terminal of the Micom normal?

Is voltage at #52 terminal of the micom

Are voltage at #48 and #49 of the

normal?

of the micom normal? 5VDC

micom normal?

10ms

normal?

micom normal?

Replace

micom

unit?

YES

10ms

YES

250ms

0VDC 5VDC

YES

Normal

Refer to remote control

unit fault diagnosis

Replace PCB

module.

Are voltages at RY71(Compressor)

RY73(4-way valve) and RY72(outdoor fan)

normal? DC12V Is voltage at SS71(indoor fan)

YES

Check connections compressor 4-way

valve, outdoor fan

and indoor fan.

Is output voltage of ICO2 normal?

YES

Check PCB pattern . Replace main PCB.

Is voltage output terminal of

TLP180(PC02) normal?

YES

Replace

RY71, RY73,

RY72 and

SS71

Replace ICO2

Replace TLP180(pc02)

5-2

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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 (CN72)? (2) Is the AC voltage corre c t ? (3) Is HALL IC in indoor fan motor properly connected with the connector (CN42)? (4) Is the running capacitor ( C R 7 1 ) p roperly connected with PCB board ?

2 ) Troubleshooting pro c e d u re

Troubleshooting

After unplugging out the power cord should

Does the Solid State Relay(SS71) work properly?

SS71- SS71- 12V

be reconnected within five seconds.

YES

Does the STD lamp(Green) blink?

YES

Test rod location

YES

Is the supply voltage of the fan

motor sufficient?

Normal Voltage

Check as in the procedur “NO power parts” Refer tp

Microcomputer is out of order.

PCB is

out of order.

page 5-2.

PCB should be

replaced.

Test rod location

PCB CN72 Condition

pin #3 and #5

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Normal voltage

Fan operate about AC 180V

YES

Fan motor

is out of order.

MF-C is out of order

Replace MFC

Fan motor

should be replaced.

5-3

Troubleshooting

5-2-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)

1 ) Checklist :

(1) Is input voltage normal? (2) Is the set temperature of the remote control higher than room temperature in COOL m o d e ? (3) Is the set temperature of the remote control lower than room temperature in HEAT mode? (4) Is the POWER IN connector (CN71) linked corre c t l y ? (5) Is the outdoor unit properly connected with the TERMINAL BLOCK connector((N1), 1, 2, 3)?

2 ) Troubleshooting pro c e d u re

After unplugging out the power cord should be

reconnected within five seconds.

Does the STD lamp blink

YES

Does the timer lamp blink during operation ?

Is the power relay RY71 operated by adjusting the room

temperature?

Test rod location Normal

+ - Condition Voltage

IC4 Pin No.62 GND RY71 ON DC 4.8V

Is rating voltage ±10% range applied relay between Terminal block

NO(N1) and No. 1

YES

Check as in the procedure "No Power parts"

Room temperature sensor is

Microcomputer is

Power relay is

out of order

Refer to page 5-2.

out of order

out of order.

Outdoor unit is

out of order.

PCB should be checked.

PCB should be

checked.

Power relay should be

replaced.

5-4

Is the room sensor normal register?

10°C 20°C 30°C

17.96k Ω 12.09k Ω 8.3k Ω YES

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