troubleshooting

Samsung Electronics 4-1

4. Troubleshooting

4-1 Setting Option Setup Method

ex) Option No. :

Step 1 : Enter the Option Setup mode.

1st Take out the batteries of remote control.

2nd Press the temperature button simultaneously and insert

the battery again.

3rd Make sure the remote control display shown as .

Step 2 : Enter the Option Setup mode and select your option according to the following procedure.

Feature Display

The default value is Auto

.

Every time you push the button, the display panel reads Auto Cool Dry Fan Heat , OFF Auto Cool Dry Fan Heat repeatedly.

Push the button to set the display panel to .

Every time you push the button, the display panel reads

...... repeatedly.

Push the button to Cool

.



...... repeatedly.



...... repeatedly.

Push the button to Dry

.



...... repeatedly.



...... repeatedly.

1

2

3

4

5

6

32

1

4

564 6

Auto

��

10

��

��

Auto

Auto

Cool

Dry

Cool

Dry

4-2 Samsung Electronics

Feature Display

Push the button to Fan

.



...... repeatedly.



...... repeatedly.

Push the button to Heat

.



...... repeatedly.

Push the button to Auto

.



...... repeatedly.



...... repeatedly.

7

8

9

10

11

Step 3 : Upon completion of the selection, check you made right selections.

Press the Mode Selection key to set the display part and check the display part.

The display part shows like below when each time you press Mode button .

Step 4 : Pressing the ON/OFF button ( )

When pressing the operation ON/OFF key with the direction of remote control for unit, the sound ’’Ding’’ or ’’Diriring’’

is heard and the OPERATION ICON( ) lamp of the display is flickering at the same time, then the input of option is completed. (If the diriring sound isn’t heard, try again pressing the ON/OFF button.)

Step 5 : Unit operation test-run First, Remove the battery from the remote control.

Second, Re-insert the battery into the remote control.

Third, Press ON/OFF key with the direction of remote control for set.

• Error Mode

1st If all lamps of indoor unit are flickering, Plug out, plug in power plug again and press ON/OFF key to retry.

2nd If the unit is not working properly or all lamps are continuously flickering after setting the option code, see if the

correct option code is set up for its model.

78

10

8

91011

Fan

��

Fan

Fan

Heat

Auto

Auto

Auto Cool Dry Fan Heat Auto


Option Items

MODEL OPTIONAL CODE

NS026NHXEA 027770-13022C-200000-300000

NS035NHXEA 027770-15024E-200000-300000

NS052NHXEA 026770-19025C-200000-300000

NS070NHXEA 027770-1C026C-200000-300000

If you are going to use up to SEG 24, please refer to following instruction.SEG 17 : 0 1: Using high ceiling kit for 4way.SEG 18 :

Not in use UseChange temperature display 0(Celsius) 1(Fahrenheit)

Sound Mute 0 2Mixed operation control 0 4

If you want to use multiple functions, add each of the ‘use’ value of the function you want to used and input the final addition as option value.(Use Fahrenheit + Sound mute + Mixed operation control : 1 + 2 + 4 = 7)Ex) 044217-1d00e6-200000-300000When using Sound mute : 044217-1d00e6-200002-300000When using high ceiling kit for 4way and mixed operation error preventing function : 044217-1d00e6-200014-300000


4-2 Things to check before diagnosis

4-2-1 Display Error mode

If an error occurs during the operation, one or more LED flickers and the operation is stopped except the LED. If you re-operate the air conditioner, it operates normally at first, then detect an error again.

Description

LAMP

OPERATION TIMER DEFROST

Communication error between indoor units X

Error of temperature sensor in the indoor unit (Open/Short) X X

Error of heat exchanger sensor in the indoor unit X

Indoor fan motor mal function X X

EEPROM error

EEPROM option error

On Flickering X Off If you turn off the air conditioner when the LED is flickering, the LED is also turned off.


4-2-2 Wired remote controller(Option resource)

- If an error occurs is displayed on the wired remote controller. - To see an error code, please press the test button.

Error mode Content Measures

Product operation status in case of error

Error typeOutdoor unit compressor/

outdoor unit fan

Indoor unit communication error Check the communication line for indoor units, check the power supply of the communication phase (DC)

Operation-offCommunication

error

Communication time-out error between indoor/outdoor unit 6-packet over error

Check the communication line for indoor units, check the power supply of the communication phase (DC)


error

Indoor temperature sensor (open/short error)

Check the temp. sensor of the indoor unit room. Check the indoor PCB connector CN21(white)

Operation-offIndoor sensor

error

Indoor unit Eva In sensor (open/short)

Check the indoor unit drainage pipe sensorCheck the indoor PCB connector CN21 (white)


error

Dismount of indoor unit Eva In sensor

Check the drainage pipe has been dismounted


error

Secondary detection of indoor floating switch

Check the indoor unit’s float sensorCheck the indoor PCB connector CN51 (black)

Operation-offSelf-diagnosis

error

Indoor unit not connectedCheck the indoor unit connectionCheck the indoor unit option


error

Communication error between indoor/outdoor unit INV and Main Micom (1 min.)

Check the Main MICOMCheck the inverter MICOM

-Communication

error

Outdoor temperature sensor errorCheck the connection status of the sensorCheck the sensor locationCheck the resistance values of sensor

Operation-offOutdoor sensor

error

Cond. temperature sensor errorCheck the connection status of the sensorCheck the sensor locationCheck the resistance values of sensor


error

[inverter] Emission temperature sensor error

Check the connection status of the sensorCheck the sensor locationCheck the resistance values of sensor


error

Excessive temperature emission Not an error (discharge temp. control) -Outdoor unit

protection control error

Power cable connection error Check the status of power connection Operation-offOutdoor sensor

error


Wired remote controller (cont.)





outdoor unit fan

Non-connection error of indoor and outdoor Communication wire (connected to the power terminal)

Check the status of power connectionCheck the connection status of the communication line


error

Outdoor fan 1 error

Check the input power connection statusCheck the connection status between the motor and PCB in outdoor unitCheck the fuse of indoor/outdoor units


error

[inverter] Compressor operation error

Check the connection status of the compressorCheck the resistance between different phases in compressor

Operation-offOutdoor unit


Discharge current error/ PFC over-current error

Check the input powerCheck refrigerant is filledCheck outdoor fan operates normally



[inverter] IPM over current error

Check refrigerant is filledCheck the connection status of compressor and if it operates normallyCheck for any obstacles around indoor/ outdoor units



[inverter] Compressor rotation error

Check the connection status of the compressorCheck the resistance between different phases in compressor



[inverter] Current sensor error Check PCB operates normally Operation-offOutdoor unit


[inverter] DC link voltage sensor error

Check the connection of input powerCheck the status of RY21 and R2000 of Inverter PCB



[inverter] OTP error Check PCB operates normally Operation-offOutdoor unit


Outdoor fan 2 error

Check the connection status of input powerCheck the connection status of motor and outdoor PCB Check the fuse of indoor/outdoor unit


error

Gas leakage errorCheck refrigerant is filledCheck the indoor EVA sensor


error

Inconsistent volume Check the indoor unit’s option code Operation-offOutdoor unit



Wired remote controller (cont.)





outdoor unit fan

Communication error between indoor unit and wired remote controller

Check the connection wire linking indoor unit and wired remote controller

Normal operationWired remote

controller control error

Communication error between master and slave wired remote controller

Check the option switch that distinguishes master and slave (Available only for 1 master unit and 1 slave unit)



Cross installation error of COM1/COM2

Check the connection of outdoor unit and wired remote controller is linked to Com2 terminal of the indoor unit



Wired remote controller COM2 setting option error

Check the Dip switch for Com1 and Com2 is set to Com2




4-3 Fault Diagnosis by Symptom

4-3-1 Indoor temperature sensor (open/short)

Indoor unit display X(Operation) (Timer) X(Defrost)

Criteria In case of disconnection or short-circuit of the indoor temperature sensors

Cause of problem Disconnection or short-circuit of the relevant sensors

Yes

No

No

At that time, does the resistance value deviate from the

temp. table beside?

YesIs indoor temp. sensor connector disconnected?

Resume operation after replacing PCB

Resume operation after connecting to the

connector PCB

Indoor temp. sensor self-defect (replacement)

Disconnect the PCB from the connector of the internal temp. sensor

and then measure the resistance between the two terminals.

ex) Room temperature 26°C~ resistance 09.26KΩ <Temperature sensor

resistance values>

Current Temp. (°C)

Resistance (KΩ)

40 5.800

35 6.900

30 8.300

25 10.00

20 12.10

15 14.70

10 18.00

5 22.00

0 28.30

-5 33.90

-10 42.30


4-3-2 Indoor Heat Exchange temperature sensor (open/short)

Indoor unit display (Operation) (Timer) X(Defrost)

Criteria In case of disconnection or short-circuit of the heat exchanger of indoor temperature

Cause of problem Disconnection or short-circuit of the relevant sensors

Yes

No

No

At that time, does the resistance value deviate from the temperature

table beside?

YesIs indoor Heat Exchange

temp. sensor connector disconnected?



connector PCB

Indoor Heat Exchange temp. sensor

self-defect (replacement)

Disconnect the PCB from the connector of the internal temp. sensor

and then measure the resistance between the two terminals.

ex) Room temperature 24°C~ resistance 10.93KΩ <Temperature sensor

resistance values>

Current Temp. (°C)

Resistance (KΩ)

40 5.800

35 6.900

30 8.300

25 10.00

20 12.10

15 14.70

10 18.00

5 22.00

0 28.30

-5 33.90

-10 42.30


4-3-3 Indoor Fan error

Indoor unit display X(Operation) X(Timer) (Defrost)

Criteria Indoor fan being non-operative/ stop after excessive high speed

Cause of problem Check for motor connector disconnect/ check motor fan fastening

Yes

No

No

Is there any clogging (binding) of foreign substances in the MotorFan?

YesIs Motor connector disconnected from the PCB?



connector PCB

Resume operation after removing the foreign

substances.


4-3-4 Communication error after completion of tracking

Indoor unit display X(Operation) (Timer) (Defrost)

Criteria If communication between indoor and outdoor units has been blocked for 2 minutes during operation

Cause of problem Communication error between indoor and outdoor unit

No

Yes

Replace PCB of indoor unit after checking out the communica-

tion line

At this time, the voltage between lines is a square wave that is above DC±0.7V as

shown in the picture below

+0.7V

-0.7V

After removing the communication line that links outdoor to indoor units measure

2 lines of the outdoor unit with scope.

After reconnecting the communication line that links outdoor and indoor units,

remove communication connector in the indoor PCB. If communication does not work during operation, replace PCB of

the indoor unit.

Replace PCB after checking the communication line of the outdoor unit

PCB and connector

Good

defect



No

Yes

If the circuit part of the EEPROM is okay

(necessary component missing in EEPROM

circuit part/ damage/ soldering defect)

Resume operation after repairing it according to P8-2 circuit diagram’s

EEPROM part, P6~6-10 component list.

If problem occurs during re-operation, replace PCB

4-3-5 EEPROM circuit part defect

Indoor unit display (Operation) (Timer) (Defrost)

Criteria EEPROM circuit part defect

Cause of problem EEPROM component defect/ necessary component missing in EEPROM circuit part/ damage/ soldering


4-3-6 When outdoor units cannot be turned on

1. Cause of the breakdown

1) Is power voltage 220V?

2) Is AC power properly connected?

3) Are the LEDs of Main PCB and inverter PCB of the outdoor unit on?

4) Is the power supply of the outdoor unit 220V?

2. Inspection order

Yes

NoBridge 10de replacement (DB300)

Yes

Yes

Yes

Yes

Switch off the main power (breaker or power outlet) then turn on again after 30 seconds.

Replace outdoor unit PCB for Outdoor MICOM defect.

Check and replace the wire that connects the outdoor terminal block to outdoor unit’s PCB

(contact point, short-circuit)

NoIs the voltage of N-L of the outdoor unit’s PCB AC187V~AC253V?

Is the voltage of the both side of BD01, “~” and “~” of the outdoor unit’s

Main PCB AC187V~AC253V?

Is the voltage of C101 chemical condenser of the outdoor units’ Main PCB

DC265V~DC357V?

NoR001 Resistance replacement

Is the resistance value of R001 180Ω~220Ω?

NoConnect the connection wire of the reactor

Is reactor 1 and 2 (reactor connection wire) properly connected

to the reactor?

Yes

Power ok?

YesNo

Finish


4-3-7 DC link and over/lower voltage error

1. Inspection items

1) Is compressor operating properly?

2) Is there a connection between input power and power?

2. Inspection order

Yes

Replace PCB

Turn off the power then reconnectNo

Is EMI PCB andInverter PCB connected

properly?


4-3-8 IPM and over current error

1. Inspection items

1) Is refrigerant filled?

2) Is the compressor operating without a problem?

3) Is the compressor connected properly?

4) Are there any obstacles around the indoor/outdoor units?

2. Inspection order

Yes

Yes

Yes

Yes

Yes

Reinstall after removing obstaclesNoAre outdoor units installed correctly?

NoReinstall after removing obstaclesAre indoor units installed correctly?

NoCheck the connection status of the compressor

Is the compressor connection line properly connected to the

compressor?

NoResistance replacement

Are the values for R418current sensing resistance within

19mΩ-21mΩ?

NoOpen valvesIs service valve completely opened?

Yes

NoCompressor replacement

Is resistance value of the different compressor phases

(UV, V W, WU) less than 2Ω?

(continued on the back)

Continue


IPM and over current error (cont.)

Yes

Replace PCB

Turn off the power then reconnect the cable

NoAre the location of the temperature sensor and measurement value

normal?

Yes

Replace compressor No

Yes

Turn off the power then correct the sensor location or replace it

NoIs the connection cable between the compressor and PCB

properly connected?

Is the resistance between the Compressor body and chassis Maga Ω?

Continued


4-3-9 Compressor starting error, compressor locking error, compressor revolving error

1. Inspection items

1) Is the connection line between power and the compressor properly connected?

2) Is the resistance between different compressor phases normal?

2. Inspection order

Check the connection lineNo

Restart after turning off the power

Yes

Replace the outdoor unit’s PCB

Replace the CompressorNo

Yes

Terminate the serviceNo

Did error occur?

Yes

Replace the CompressorNoIs the resistance

between the Compressor body and chassis Maga Ω?

Yes

Is the Compressor connection line properly connected to the

Compressor?

Is resistance value of the different Compressor phases (UV, V W, W U)

less than 2Ω?


4-3-10 Outdoor temperature sensor error

1. Inspection items

1) Are the sensors connected properly?

2) Are the sensors located properly?

3) Do the resistance values of the sensors satisfy each temperature?

2. Inspection order

Yes

Yes

Yes

Replace temperature sensorNo

Reconnect the temperature sensor connector

No

Power off


No

No

Yes

Are connectors properly connected to the

relevant colors?

Are temperature sensors connected without separation?

When measuring the resistance of both sides with a single

temperature sensor, does it indicate 10KΩ at room temperature of 25°C?

Yes

Replace PCB after turning off the powerNo

After assembling the temperature sensors on PCB check

the voltage of both sides. Do they indicate DC1V~DC4V?

Is there a short circuit or defective contact in

the sensor wires?

Replace temperature sensor after turning off the power

Yes

Power on

Replace PCB after turning off the power

ex) Room temperature 24°C ~ resistance 10.28kΩ

<Temperature sensor resistance values>

Current temperature

(°C)

Resistance (KΩ)

Current temperature

(°C)

Resistance (KΩ)

70 4 20 12

60 5 10 20

50 6 0 30

40 7 -10 40

30 8


4-3-11 Emission temperature sensor error

1. Inspection items




2. Inspection order

Yes

Yes

Yes



No

Power off


No

No

Yes


relevant colors?




Yes





the sensor wires?


Yes

Power on


ex) Room temperature 23°C ~ resistance 205.4kΩ


Current temperature

(°C)

Resistance (KΩ)

Current temperature

(°C)

Resistance (KΩ)

80 40 30 180

70 50 20 220

60 60 10 320

50 90 0 550

40 110


4-3-12 Cond temperature sensor error

1. Inspection items




2. Inspection order

Yes

Yes

Yes



No

Power off


No

No

Yes


relevant colors?




Yes





the sensor wires?


Yes

Power on


ex) Room temperature 24.5°C ~ resistance 10.17kΩ


Current temperature

(°C)

Resistance (KΩ)

Current temperature

(°C)

Resistance (KΩ)

70 4 20 12

60 5 10 20

50 6 0 30

40 7 -10 40

30 8


4-3-13 Communication error between indoor/outdoor units (1min.)

1. Inspection items

1) Is the communication line between indoor and outdoor units connected properly?

2) Is there a communication connection between power line and communication line?

2. Inspection order

Yes

Replace PCB of the outdoor unit after turning off.

No

Terminate serviceNo


No

Yes

Is there a communication error?

Is there a communication connection between power line and

communication line?

Is the outdoor terminal block F1–F2, less than DC5V?

Yes

Connection line checkup

When measuring F1–F2, the outdoor terminal block, if the voltage varies

(communicates) below DC5V, the connection status of the connection line is normal.


4-3-14 Outdoor fan error

1. Inspection items

1) Is input power and power connected properly?

2) Is motor connection line properly connected to the PCB of the outdoor unit?

3) Is the fuse for indoor/outdoor unit connected?

4) Are there any obstacles around Motor or Propeller?

5) Is Motor Driver out of order?

2. Inspection order

Yes

Remove the Fan lock

Yes

NoCheck fan is locked

Replace the FanNo

Does the color of fire wire match?

Yes

Reconnect the connectorNoIs the connection between Fan

and PCB proper?

Yes

No

Check if the outdoor unit’s power supply is defective

Yes

Is the voltage of the No.1 and No. 3 pin of the CN71

between 250V~350V?

Yes

Is the voltage of the No.1 and No. 3 pin of the CN01 between 1V~5V?

No

Is there any change in the voltage of the no.13 pin of

the IC01 (MICOM)?

Defective MICOMReplace the main PCB of the outdoor unit

(continued on the back)

Continue

Replace the main PCB ofthe outdoor unit


Outdoor fan error (cont.)

Replace the main PCB of the outdoor unit

No Replace the main PCB of the outdoor unit

Yes

No

Is there any change in the voltage of the

no.13 pin of the IC01 (MICOM)?

Replace BLDC fan motor

30 seconds after turning off the power, separate BLDC Fan

connector CN71

Yes

Continued

Is there any change in the voltage

of the no 3 pin and no.6 pin of the IC01 (MICOM)?


4-3-15 Discharge current error/ PFC over-current error

1. Inspection items

1) Is input power correct?


3) Is the outdoor fan spinning correctly?

4) Are there any obstacles around indoor/outdoor units?

2. Inspection order

Yes

Yes

Yes

Yes

Reinstall after removing obstacleNoIs the outdoor unit installed correctly?

NoReinstall after removing obstacleIs indoor unit installed correctly?

NoOpen valvesIs the service valve open completely?

NoReplace the compressorIs the compressor operating normally?

Replace PCB


4-3-16 Gas leakage error

1. Inspection items


2) Is the indoor EVA sensor connected properly?

2. Inspection order

ace thNo

Yes

Reconnect the sensor connectorNo


Yes

Replace the outdoor unit’s PCB

Replace the compressorNo

Yes

Terminate the serviceNo

Did error occur?

Yes

Open valvesNo

Is the service valve open completely?

Yes

Is the indoor EVA sensor connected properly?

Is refrigerant filled?

Is resistance value of the different Compressor phases (UV,

V W, W U) less than 2Ω?


4-3-17 Other

1. Current sensor error

Check PCB operates normally then replace the PCB

2. Compressor V limit error

Check the compressor operates normally then replace the compressor. If an error still occurs after the replacement of the

compressor, replace the PCB

3. OTP error

Check PCB operates normally then replace the PCB

4. DC link Voltage Sensor Error

Check the connection between input power and the power is okay then replace the PCB

5. AC zero Crossing signal out error

Check the connection between input power and the power is okay then replace the PCB

6. Inconsistent volume

Check the option code of the indoor unit.

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