Samsung AM20, AM14, AM14A1E2-XEH Troubleshooting

5. Troubleshooting

5-1 Items to be checked first

1 ) Is the voltage of the power corre c t ?

The input voltage shall 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 COOL 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 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 Timer LED only of the indoor unit lights up and the

air conditioner does not operate.

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.

Timer is being activated and the unit is in ready mode. The unit operates normally if the timer operation is cancelled.

6 The compressor stops intermittently in a COOL mode or DRY

mode, and fan speed of the indoor unit decreases.

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 blinking (1Hz) 2 TIMER LED blinking (1Hz) 3 O P E R ATING and TIMER LED blinking (1Hz) 4 FAN LEA blinking (1Hz)

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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 38Orpm)

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) 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 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

YES

Replace PCB

display

Is DC voltage of PCB

display normal?

Is 198~264VAC

applied to the

primary side of the power

transformer?

•Check linkage between power cord and terminal tap

•Check fuse

Is 14~18VAC appear in

the secondary side of the

power transformer?

YESNO

Replace power

transformer

Replace resonator (X501)

Is operation normal?

YES

Remove power cord and plug in again

in approx. 5 seconds

Is operation lamp blinking?

Does operation start when

run/stop 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 #62 (compressor),

#60(4 way valve) and #61 (outdoor fan)

of the micom normal? 5VDC

Is voltage of #63 (indoor fan) of the

DC5V

Is voltage at #32 terminal of the Micom normal? Is voltage at #64 terminal of the Micom normal?

Is voltage at #25 terminal of the micom

Are voltage at #30 and #31 of the

YES

unit?

YES

normal?

YES

micom normal?

10ms

YES

normal?

10ms

YES

micom normal?

100ns

YES

Replace

micom

0VDC 5VDC

YES

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

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 D101~D105(IN4007) normal?

YES

Replace

RY71, RY73,

RY72 and

SS71

Replace ICO2

Replace IN4007

5-2

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5-2-2 When the power is not applied(Outdoor unit)

1) Checking points (1) Is the voltage of the power normal? (2) Is the power line in good contact?

(3) A re the primary (CN71) and secondary (CN11) connectors of the power trans in good

c o n t a c t ?

(4) Is the power voltage of the IC01 (KA7812) normal? (DC11 . 5 V ~ D C 1 2 . 5 V )

2 ) Trouble shooting pro c e d u re

Turn off the power, and then turn on the power

in five minutes.

Troubleshooting

Does the power of the IC01(KA7812) match with

the voltage of DC12V?

Is the F701(3.15A) fuse blown?

Is the secondary voltage of the trans normal?

(AC15V~AC25V)

Is the first voltage of the trans normal?

(AC198V~AC264V)

Is the rectifying diode(D101~D104) normal?

Is the voltage at both ends of the C102

electrolytic condenser in the range of DC16~DC25V?

Is the voltage at both ends of the C104 electrolytic

condenser DC12V?

Normal operation

Replace the fuse

Replace the trans

Check and replace

the rectifying diode

Replace the C102

and C104.

Is the IC01(KA7812) normal?

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Replace the IC01

End

5-3

Troubleshooting

5-2-3 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 corre c t ? (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 pro c e d u re

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

SS71- SS71- 12V

Is the supply voltage of the fan

Test rod location

PCB CN73

YES

motor sufficient?

Condition

Fan operate AC 180V

Normal Voltage

Normal voltage

Check as in the procedur “NO power parts”

Refer tp page 5-2.

Microcomputer is out of order.

PCB is

out of order.

PCB should

be replaced.

5-4

YES

Fan motor

is out of order.

MF-C is out of order

Replace MFC

Fan motor

should be replaced.

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5-2-4 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 POWER IN connector (terminal-tab) linked corre c t l y ? (4) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(5P)?

2 ) Troubleshooting pro c e d u re

(1) Checking pro c e d u res for the indoor unit.

After unplugging out the power cord should be

reconnected within five seconds.

Troubleshooting

Does the operating 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 IC1 Pin No.63 GND RY73 ON DC 4.8V IC1 Pin No.62 GND RY72 ON DC 4.8V

1) Is AC 198 - 264V applied relay between Terminal Tap(TB71) and RY 71 terminal No. 3

2) Is AC 198 - 264V applied relay between Terminal Tap(TB71) andCN 71 terminal No. 1

YES

NO 1

1 NO

YES 3

Check as in the procedure "No Power parts"

Refer to page 5-2.

Room temperature sensor is

out of order

Microcomputer is

out of order.

Power relay is

out of order

A Room operation

“A”Compreessor or outdoor fan-motor replaced

2 NO

PCB should be checked.

Power relay should be

PCB should be

checked.

replaced.

B Room or C Room operating

Proceed to the checking points for the outdoor unit.

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Is the room sensor normal register?

10°C 20°C 30°C

17.96k Ω 12.09k Ω 8.3k Ω

YES 3

5-5

Troubleshooting

(2) Pro c e d u res for checking the outdoor unit.

Turn off the power, and then turn on the

power in 5 seconds.

Does the compressor operate in 2 minutes after

the relay (RY71)

is activated at the indoor unit after 3 minutes?

Does the photo coupler (IC02, IC03)

corresponding to the indoor units (B & C) operate?

Is the DC voltage applied to both ends of the C901? (1) Is the voltage DC6V when either of the indoor

units (B & C) is turned on?

(2) Is the voltage DC8V when both of the indoor

units are turned on?

(1) Does the N01 pin output of the IC04 maintain "Low"? (2) Does the N014 pin output of the IC04 maintain "High"?

When either of the indoor units (B & C) is turned on.

(3) Does the N014 pin output of the IC04 maintain "Low"?

When both of the indoor units (B & C) is turned on.

Does the No7 pin output of the IC04 maintain "Low"?

N N

•Check and replace the resistance

•Check and replace the electrolytic condenser (C901)

(1) Is the NO3 pin voltage

of the IC04 DC5V?

(2) Is the NO12 pin voltage

of the IC04 DC7V?

Is the No.5 pin voltage

of the IC04 DC5V?

Check and replace the relevant

(R901, R928, R931) and diode (D907, D908).

Normal

IC (IC02, IC03).

• Check and replace the IC04.

•Check and replace the resistance. (R902, R903,R905, R906)

Check and replace the

R913, R915 and IC04.

Are the Q901, and 904 in "Turn-off" condition?

Are the Q902, Q903 and Q905 in "Turn-on" condition?

Does the operation of the Q701 lead to

activation of the compressor relay (RY71)?

Replace the "B" compressor.

5-6

Is the voltage at both

ends of the C903 DC10V?

(Resistance at both ends of the relay: About 150 )

Check and replace each transistor

Check and replace the Q701 and relay.

Check and replace the

R911, D901, and C903.

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