Samsung AD24, AD18, AD18A1E2-BOL 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 the 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 4 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 re l a t-

ed 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 for 3minutes

when a power plug of the outdoor unit is plugged in for the first time.

2 In a COOL operation mode, the compressor does not operate

at a room temperature lower than the setting temperature. In a HEAT operation mode, the compressor does not operate at a room temperature higher than the setting temperature.

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 the

indoor unit 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.

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 12 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 being overheated 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 indoor heat exchanger from being frozen.

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

on the display panel.

Operating Timer Fan Turbo

(GREEN) 2 3 4 5

(GREEN)

X X

(GREEN)

Display

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Self Diagnosis

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 speed is below 450rpm)

In case that the communication between the indoor unit and outdoor unit is not made for 60 seconds Outdoor sensor Error (open or short)

- Outdoor sensor

- Pipe sensor A, B The malfunction ot 4way valve in heat mode operation.

: Lamp blinking X : Lamp OFF

5-1

5-2 Checking and Testing Operations (Outdoor Unit)

To complete the installation, perform the following checks and tests to ensure that the air conditioner is operating corre c t l y.

1. Review all the following elements in the installation:

• Installation site stre n g t h

• Piping connection tightness to detect any gas leakages

• Connection wiring

• Heat-resistant insulation of the piping

• Drainage

• Earthing wire connection

• Correct operations (follow the steps below)

• Room select switch in the indoor unit

ROOM NO

A unit B unit

2. Apply the power to the outdoor unit.

- Check the fuse (250V~, 5A) : The fuse is open when the power line

OUTDOOR UNIT

Room select switch

A/R B/R

(L, N) is short.

3. Check the connection of PCB communication of outdoor unit. (Check whether the red LED of outdoor unit PCB is flickering.)

• The communication lamp is flickering after the display of each unit on

the outdoor PCB display part. (every one second). LED is not flikering, if the connection is bad or the room select switch is located in the wrong position.

- LED lamp (red) flickering after display of A (1 sec)

- LED lamp (red) flickering after display of b (1 sec)

- LED lamp (red) flickering after display of C (1 sec) Note : PCB switch “C” is used for triple split multi air conditioner.

R e s u l t : If all of three units display lamps are flickering, the connection

w i res and the room option connections are good.

INDOOR UNIT

Room select switch(A, B unit)

A : PCB display B : Red LED C : PCB switch

If the lamp is not flickering, check as follows:

A. Check the display part of indoor unit of each unit (A,B) after outdoor

unit PCB switch S/W- A is on. Check the status of each unit indoor room select switch. (Adjust the select switch suitable to the unit A, B.)

- A unit : OPERATION LED on, TIMER LED flickering

- B unit : O P E R ATION LED on, TIMER and FAN LED flickering

- C unit : O P E R ATION LED on, TIMER and FAN, TURBO LED

B. Check the communication connection of outdoor unit PCB

(Check whether the red LED of outdoor unit PCB is flickering). The communication lamp is flickering after the display of each unit on the

outdoor unit PCB. (every one second)

- LED lamp (red) is flickering after display of A (1 sec)

- LED lamp (red) is flickering after display of b (1 sec)

- LED lamp (red) is flickering after display of C (1 sec)

Result: If all of three units display lamps are flickering, the connection

flickering (In case of triple split multi air conditioner)

UNIT

OPERATION TIMER FAN TURBO A B C

Lamp ON

w i res and the room option connections are good.

Lamp OFF Lamp Flasher

5-2

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Troubleshooting

DISPLAY EXPLANATION

Outdoor sensor error (Short/Open)

Outdoor A cond pipe sensor error (Short/Open) Outdoor B cond pipe sensor error (Short/Open)

Outdoor C cond pipe sensor error (Short/Open) A unit test operation error B unit test operation error

C unit test operation error A unit test communication error

B unit test communication error C unit test communication error A,B,C unit all communication error

A room test operation OK B room test operation OK

REMARK

Be sure to check after applying the power to the outdoor unit.

Display when the test operation finishes.

• When the pipe temperature difference of indoor unit (pipe temperature 4 minutes before

- Actual pipe temperature) is less than 5˚C.

Be sure to check during the test operation.

Display of power application. Display 4 minutes after the COMP is on.

C room test operation OK Communication unit number display : A unit Communication unit number display : B unit

Communication unit number display : C unit (In case of triple split multi air conditioner)

•Normal operation

Unit A,B and C are changed every one second. The communication lamp is flickering after

display of each unit.

(possibility to check the communication status)

•During the test operation the unit under test

is on and off every 0.25s.

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5-3

Troubleshooting

4. Check the test operation status by pressing the PCB switch S / W- A and S/W-B of outdoor unit.

• Check the operation status by pushing the switch one at time.

• Perform the test operation only for the unit selected last.

• Check the pipe pre s s u re and the other operation status

during the test operation.

• Check items when the error occurs during the test operation

(each unit)

- Check there is enough re f r i g e r a n t .

- Check pipe connections.

OUTDOOR UNIT

a : PCB display b : Red LED c : PCB switch

EEXXAAMMPPLLE

• In case of unit A test, push once the PCB switch S/W- A ( s a m e

for unit B).

- In such a case, the indoor unit of unit A is operated automatically by the outdoor unit.

- In case the unit A test stops, push once more the switch S / W- A .

< Operation >

1. Once the test is started, the COMP is on and Good (displayed Gd) or Error (displayed Er) is displayed after 4 minutes .

: Taking diff e rence between the present temperature of

indoor heat exchanger and the temperature 4 minutes later, if the temperature diff e rence is over 5°C, the connection is good or if the temperature diff e rence is below 5°C, the connection is bad.

2. If the result of the test operation is good operation, is possible for 30 minutes max.

If there is an erro r, the outdoor unit shall be stopped i m m e d i a t e l y. If an error occurs, push switch S/W- A or S/W-B once to resume from the error status. Restart is then possible.

3. Once the test operation is completed, push switch S/W- A o r S / W-B to finish the test.

4. Once the test is completed, operate the indoor unit normally.

5. Check the operation is normal. Start up is over.

5-4

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5-3 Fault Diagnosis by Symptom

5-3-1 When the power voltage is not available

1 ) Inspection items

(1) Is the power voltage is normal? (The rating voltage ±10% range) (2) Is the power cord is correctly connected and is the contact good? (3) Does the sound “ting” come out with the operation lamp (green) flickering when the

power is applied? If it is not flickering, do inspect and repair in accordance with the following inspection s e q u e n c e .

2 ) Inspection sequence

Is the operation lamp

No trouble

(normal)

of indoor unit on when the operation /stop button of remote controller

is pressed?

Is the operation lamp flickering with the

Apply the power

sound of “ting”?

Check of remote

controller

Normal

Is the communication

signal of remote controller surely sent and

received ?

Is there no problem

between the connector

of Ass’y display PCB and

the receiving module?

Replace of Ass'y dis-

play PCB

Is the outdoor power connected normally?

Is the fuse (F701, 250V, 3.15A) of PCB open?

Is the voltage at Socondary side of trans-

former of PCB (TN71)? (AC15V~AC25V)

Is the output voltage of voltage regulator

IC (KA 7812) DC 10V and 12V?

Is the output voltage of electrostatic voltage

regulator IC (KA 7805) DC 4.5 V - 5.5 V?

Check of the installation method

and electrical circuit

Replace the fuse (250V, 3.15 A).

Transformer is out of order -

replace

Repair and replace the power

source rectifying diode (D101-

D105) and KA7812.

KA7805 is out of order - replace

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Replace the main PCB of indoor unit

5-5

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