1. Error Display 1) The Meaning of the First Alphabet

TROUBLE SHOOTING (Cycle Part)

1. Error Display 1) The Meaning of the First Alphabet

E P U A

Error concluded by self-diagnosis

E101~E700Detailed item refers error code

Pre Error Code

P701~P800 Items that need more than 2 times detection to conclude through error

The address of Outdoor Unit occurred error

U200 : Main UnitU201 : Sub1 UnitU202 : Sub2 UnitU203 : Sub3 Unit

The address of Indoor Unit occurred error

A047 : Error Occurred At Indoor Unit Whose address 47

2) Error Display method

Error Type Error Display Method Examples

Error Occurred at Indoor UnitError Number →Address of Indoor unit → Error Number(repeat indication)

E471→A002→E471→A002

Error Occurred at Outdoor Unit or Other Error

Error Number →Address of Outdoor unit → Error Number(repeat indication)

E471→U200→E471→U200

○ In case of several Error should be registered at the same time, Indicator will display one error whose priority is highest. ( Refer Error Code Table to know priority order )

○ When the same Error Occurred in several Indoor Units, Indicator will display one address of indoor unit whose address number is lowest.


Error Code (Priority Order) Error Details

E221 Short or Open of the Outdoor air temperature sensor

E251 Short or Open of the discharge temperature sensor of Digital compressor

E256 Short or Open of the discharge temperature sensor of Fixed compressor 1



E291 Short or Open of the high pressure sensor

E296 Short or Open of the low pressure sensor

E271 Short or Open of the Sump. Temperature sensor of the compressor 1

E231 Short or Open of the Cond. out temperature Sensor

E307 Short or Open of the Oil balance temperature Sensor1

E308 Short or Open of the Suction temperature sensor

E311 Short or Open of the sub cooler temperature sensor

E425 Reverse Phase or Phase Open

E452 Voltage Dip Error

E440 Stop Operating Heating mode when Outdoor temperature is over 30℃

E442 Stop Operating Heating charging mode when Outdoor temperature is over 15℃

E443 Stop Operation by Low Pressure

E431 Self diagnosis failure of Oil balance valve 1

E202 No response error after tracking is completed

E201Communication error among outdoor units and indoor units

(Pre-tracking failure or setup indoor unit number is different from the real)



E203 Communication error between Outdoor unit’s main and sub MICOM or among outdoor Units

E407 Comp down By high pressure

E410 Comp down By low pressure

E403 Comp down By Anti-freezing control

E413 Comp down By Sump Protection Control

E554 Loading failure

E416 Comp down by compressor discharge temperature

E241 Cond. out temperature Sensor breakaway

E269 Suction temperature Sensor breakaway

E453 Error of Fan Motor’s high temperature

E454 Fan motor RPM Error

E455 Error of fan motor IPM high temperature

E458 CT over current

E457 Error of fan motor’s reverse revolution

E162 Outdoor Unit’s EEPROM Error

E560 Switch Option Set up Error

E428 Comp down by compression ratio control

E121 Short or Open of indoor unit’s air temperature sensor

E122 Indoor Unit EVA in Sensor’s Short or open

E123 Indoor Unit EVA out Sensor’s Short or open



E154 Indoor Unit’s Fan Error

E124 Communication error message sent from the indoor unit

E153 Indoor Unit Floating S/W error (2nd check)

P701 Indoor Unit Floating S/W error (1st check)

E152 Indoor Unit EEV Closing error (2nd check)

P702 Indoor Unit EEV Closing error (1st check)

E151 Indoor Unit EEV opening error (2nd check)

P703 Indoor Unit EEV opening error (1st check)

E128 Indoor Unit EVA in Sensor Breakaway

E129 Indoor Unit EVA Out Sensor Breakaway

E131 Indoor Unit Heater Sensor Breakaway

E265 Sump temperature Sensor of Digital Comp. or Fixed Comp.1 Breakaway

E267 Fixed Comp.2 Sump’s Temperature Sensor Breakaway

E268 Fixed Comp.3 Sump’s Temperature Sensor Breakaway

E262 Fixed Comp.1 Discharge’s Temperature Sensor Breakaway



E456 Fan Motor Over Current Error

E461 CT Low Current

CH Stop Operating the unit when the crank case heater is on


E440, E442 : E440 Stop Operating Heating mode when Outdoor temperature is over 30℃

E442 Stop Operating Heating charging mode when Outdoor temperature is over 15℃

Decision Method E440 : Just before outdoor unit operates in heating mode, Outdoor air temperature sensor reading over 30℃E442 : Just before outdoor unit operates in heating charging mode by key mode(K1 S/W in the outdoor unit’s PCB ), Outdoor air temperature sensor reading over 15℃

Possible Cause It is not error of product. (spec. to protect products)It is desired that refer and use working conditions range of temperature.If the value of outdoor air temperature sensor is different from the real, please replace the outdoor air temperature sensor with new one.


E443: E443 Stop Operation by Low Pressure

Decision Method If the low pressure of the main unit is below 3.1kgf/ ㎠ G for 3 seconds continuously In cooling mode before Pump down start, Stop operationIf the low pressure of the main unit is below 2.6kgf/ ㎠ G for 3 seconds continuously In Heating mode before Pump down start, Stop operation

Possible Cause Refrigerant LeakageLow pressure sensor breakdown

Action 1. Measure the low pressure using manifold gage2. Read the low pressure of the system using S-NET or View mode3. Compare the value of case1 with case2.4. If these value are similar, most of refrigerant is leaked. Please emit

remainder refrigerant and do re-vacuum & re-charging5. If these value are different greatly, please check the connector of the low

pressure sensor or replace the low pressure sensor with new one

Attention : After recovery of refrigerant (Pump down), because refrigerant fills only in outdoor heat exchanger,

preceding descriptions error can arise .In this case, If you open service valve after connecting pipe normally with indoor unit, error will be

eliminated because refrigerant circulates to low-pressure side.


E431: E431 Self diagnosis failure of Oil balance valve 1

Decision Method 1. No check in case that one outdoor unit is installed2. In module application, check the condition of Oil balance valve 1 or senor breakaway

3. When hot gas engaged after close the Oil balance valve 1, if the temperature of oil balance tube arise over 5℃, display error (Valve Is not closed)4. During Oil balance operation with the Oil balance valve 1 open, if the temperature of oil balance tube doesn’t change over 7℃, display error (Valve Is not open)

Possible Cause Temperature Sensor of Oil balance valve 1 breakawayMalfunction of Oil balance valve 1Solenoid coil of electric connection badness

Action 1. Check the temperature sensor is inserted correctly in sensor holder2. Check the value of the temperature sensor is proper3. Check the oil service valve is open4. Check the solenoid Coil of the valve is properly installed5. Check the resistance of the Coil (Was it not short-circuited?)6. Replace the Oil Valve with new one

Attention : Never use welding machine when cut off the oil valve, Do use Tube cutter. ( there is danger of production of fire because oil fills in pipe )


E407: E407 Comp down By high pressure

Decision Method The Value of the high pressure sensor is over 41kgf/ ㎠

Possible Cause <Cooling Mode>Outdoor Unit’s fan motor breakdown or restriction, Fan motor Driver wire is bad or openOutdoor Heat exchanger contamination, Service Valve is closed, Excessive refrigerant<Heating Mode>Indoor Unit’s fan motor breakdown or restrictionIndoor unit’s fan motor capacitor badness or connecting wire openService Valve is closed, Excessive refrigerant

Action 1. Check the service valve is open2. Check the value of the high pressure sensor is proper using manifold gage3. Check the EEV of both indoor unit and outdoor unit4. Check the fan operation5. Confirm refrigerant quantity


E410: E410 Comp down By low pressure

Decision Method If the low pressure of the main unit is below 2.6kgf/ ㎠ G In cooling mode, Stop operationIf the low pressure of the main unit is below 1.4kgf/ ㎠ G In Heating mode, Stop operation

Possible Cause Refrigerant shortage, EEV choked, Service valve Closed, Compressor Unloading badness, Leakage of discharge check valve of stopped unitWorking conditions deviation ; Outdoor temperature is below -5℃ <Cooling Mode> Outdoor temperature is below -20℃ <heating Mode>

Action 1. Check the service valve is open2. Check the value of the low pressure sensor is proper using manifold gage3. Check the EEV of both indoor unit and outdoor unit4. Check the fan operation5. Confirm refrigerant quantity


E403: E403 Comp down By Anti-freezing control

Decision Method The temperature of the operating indoor unit’s heat exchanger keeps below -4℃ (more than 5 minutes)

Possible Cause EEV does not work properlyIndoor unit fan motor restriction or badnessAir filter of the indoor unit is choked severely

Action 1. Removes obstacle and cleans dust filter. Error reset (K3)2. Operate the only relevant indoor unit and check the fan operation3. Check the PCB & motor4. Check the Pressure5. Confirm refrigerant quantity


E413: E413 Comp down By Sump Protection Control

Decision Method The temperature of Sump keeps below 95℃ (more than 5 minutes)

Possible Cause Compressor Loading badnessSump temperature sensor badness

Action 1. Connect the S-Net2. Check the operation of PWM Valve (normal loading/unloading)3. Check the attachment status of sump temperature sensor4. Take the sump sensor apart from the compressor and leave it alone in

ambient air for about 10 minutes, and check the value of the sump sensor is similar with the ambient air temperature.

5. Replace sump sensor


E416: E416 Comp down by compressor discharge temperature

Decision Method The value of discharge temperature sensor is over 135℃

Possible Cause Refrigerant Shortage, EEV Choking, Service valve is closed, Sensor badness,Liquid EEV badness, Liquid Tube Valve badness, Leakage of discharge check valve of stopped unit

Action 1. Check the resistance of the discharge temperature sensor (refer E251)2. Check the Service Valve is open3. Check the EEV Operation4. In case of partial outdoor units are operated, Check leakage from liquid tube

valve or discharge check valve of no-operating outdoor units 5. Confirm refrigerant quantity


E241: E241 Cond. out temperature Sensor breakaway

Decision Method No Check in cooling modeIn Heating mode, it must satisfy below conditions simultaneously (more than 20min.) 1. average high pressure : 25kgf/ ㎠ G 2. average low pressure : 8.5kgf/ ㎠ G 3. Teva,out – Tair,in ≥ 3℃ 4. Teva,in – Tair,in ≥ 2℃ 5. Tcond,out – Tair,out ≤ -2℃ 6. All Compressor Operation & All indoor Unit operation (thermo on)

Possible Cause Cond. Out sensor breakaway or badnessOutdoor heat exchanger path pipe is choked

Action 1. Check the temperature sensor is inserted correctly in sensor holder2. Check the resistance of the discharge temperature sensor (refer E231)3. Is change in sensor value at heating operation after stop? Replace Heat exchanger assembly with new one.


E269: E269 Suction temperature Sensor breakaway

Decision Method Tsuc,ini ; Suction temperature of the compressor on the verge of operationTsuc,real ; Suction temperature of the compressor operating now

| Tsuc,real - Tsuc,ini | ＜ 2℃ (more than 30 min.)

Possible Cause Suction temperature sensor breakaway or badness

Action 1. Check the temperature sensor is inserted correctly in sensor holder2. Check the resistance of the discharge temperature sensor (refer E231)


E458: E458 CT over current

Decision Method The CT value of the relevant compressor is over 20A ( more than 5 sec.)

Possible Cause CT sensor badnessCompressor Breakdown

Action 1. Check the resistance of the CT sensor connector2. Check the value of CT sensor is zero at stop3. Compare the value of CT sensor with another measurement device4. Replace the relevant compressor


E428: E428 Comp down by compression ratio control

Decision Method (High pressure + 1) / (Low Pressure + 1) ≥ 8.5 (more than 10 min.)

Possible Cause Pressure sensor badnessEEV malfunctionPipe is clogged

Action 1. Check the service valve is open2. Check the value of the pressure sensor (S-Net or View mode) is proper using

manifold gage3. Check the operation of EEV (Outdoor units / indoor units)4. Check pipe status5. In case of partial outdoor units are operated, Check leakage from liquid tube

valve or discharge check valve of no-operating outdoor units 6. Confirm refrigerant quantity


E153: E153 ↔ A*** Indoor Unit Floating S/W error (2nd check)

P701 Indoor Unit Floating S/W error (1st check)

Decision Method

Possible Cause Drain pump BreakdownFloating S/W malfunction

Action 1. After separating Floating S/W connector, check the resistance of both ends of the Floating S/W is infinity. (OPEN when there is no water)

2. Check the supplied voltage to the Drain pump is proper. Replace PCB of Indoor Unit.

3. Check the operation of Drain pump Replace Drain pump of Indoor Unit.

※ After Service, Indoor unit should be reset by power supply


E152: E152 ↔ A*** Indoor Unit EEV Closing error (2nd check)

P702 Indoor Unit EEV Closing error (1st check)

Decision Method In Cooling mode, it must satisfy below conditions simultaneously (more than 20min.) 1. Tcond,out – Tair,out ＞ 3℃ 2. Tair,in – Teva,in ＞ 4℃ 3. Tair,in – Teva,out ＞ 4℃ 4. Compressor is operating normally & relevant indoor Unit is ON (thermo on)In Heating mode, it must satisfy below conditions simultaneously (more than 3min.) 1. average high pressure : over 18kgf/ ㎠ G 2. after 5 minutes from safety start ends 3. more than 2 indoor unit are operating in heating mode (thermo on) 4. Tair,in – Teva,in ＞ -3℃ & Tair,in – Teva,out ＞ -3℃

Possible Cause Indoor unit’s EEV does not open

Action 1. Check the EEV connector is inserted correctly in the indoor PCB2. Check the EEV Coil is inserted correctly in the EEV body3. Check the resistance of the coil4. Replace EEV assembly with new one.


E151: E151 ↔ A*** Indoor Unit EEV opening error (2nd check)

P703 Indoor Unit EEV opening error (1st check)

Decision Method No check In Heating modeIn Cooling mode, it must satisfy below condition (more than 20min.) - Either Teva,in or Teva,out of stopped indoor unit is below to zero

Possible Cause Indoor unit’s EEV does not close

Action 1. Check the EEV connector is inserted correctly in the indoor PCB2. Check the EEV Coil is inserted correctly in the EEV body3. Check the resistance of the coil4. Replace EEV assembly with new one.


E128: E128 ↔ A*** Indoor Unit EVA in Sensor Breakaway

Decision Method In Cooling mode, it must satisfy below conditions simultaneously 1. Tcond,out – Tair,out ＞ 3℃ 2. Tair,in – Teva,in ≤ 4℃ * 3. Tair,in – Teva,out ＞ 4℃ 4. Compressor is operating normally & relevant indoor Unit is ON (thermo on)In Heating mode, it must satisfy below conditions simultaneously 1. average high pressure : over 25kgf/ ㎠ G 2. average low pressure : below 8.2kgf/ ㎠ G 3. Tcond,out – Tair,out ＜ -2℃ 4. Teva,in - Tair,in ＜ 2℃ * 5. Teva,out - Tair,in ≥ 3℃ 6. Compressor is operating normally & relevant indoor Unit is ON (thermo on)

Possible Cause Indoor unit’s Eva in sensor breakaway

Action 1. Check the Eva in sensor is inserted correctly in the sensor holder


E129: E129 ↔ A*** Indoor Unit EVA out Sensor Breakaway

Decision Method In Cooling mode, it must satisfy below conditions simultaneously 1. Tcond,out – Tair,out ＞ 3℃ 2. Tair,in – Teva,out ≤ 4℃ * 3. Tair,in – Teva,in ＞ 4℃ 4. Compressor is operating normally & relevant indoor Unit is ON (thermo on)In Heating mode, it must satisfy below conditions simultaneously 1. average high pressure : over 25kgf/ ㎠ G 2. average low pressure : below 8.2kgf/ ㎠ G 3. Tcond,out – Tair,out ＜ -2℃ 4. Teva,out - Tair,in ＜ 3℃ * 5. Teva,in - Tair,in ≥ 2℃ 6. Compressor is operating normally & relevant indoor Unit is ON (thermo on)

Possible Cause Indoor unit’s Eva out sensor breakaway

Action 1. Check the Eva out sensor is inserted correctly in the sensor holder


E265: E265 Sump temperature Sensor of Digital Comp. or Fixed Comp.1 Breakaway

Decision Method Tsump,ini ; Sump temperature of the compressor on the verge of operationTsump,real ; Sump temperature of the compressor operating now

| Tsump,real - Tsump,ini | ＜ 2℃ (more than 60 min.)

No Check after 60 min. from starting operation

Possible Cause Sump temperature sensor breakaway

Action Check the attachment status of sump temperature sensor

Note : Only Digital compressor or Fixed 1 compressor has the sump sensor


E262,E263,E264: E262 ↔ U*** Fixed Comp.1 Discharge’s Temperature Sensor Breakaway

E263↔ U*** Fixed Comp.2 Discharge’s Temperature Sensor Breakaway

E264↔ U*** Fixed Comp.3 Discharge’s Temperature Sensor Breakaway

Decision Method It must satisfy below condition (more than 30min.) 1. The CT sensor value of the relevant compressor is over 5A 2. Discharge temperature ＜ Saturation temperature calculated with high pressure

Possible Cause Compressor Discharge Temperature sensor breakawayCompressor Discharge Temperature sensor badness

Action 1. Check the temperature sensor is inserted correctly in sensor holderInsert the sensor in the sensor holder

2. Check the resistance of the discharge temperature sensor (refer E251)Replace the sensor

3. Check the sensor position corresponds to compressor correctlyChange the sensor position correctly


E461: E461 CT low current

Decision Method The CT value of the relevant compressor is below 4A ( more than 10min.)

Possible Cause CT sensor badnessCompressor BreakdownOLP Trip

Action 1. Check the resistance of the CT sensor connector2. Check the value of CT sensor is zero at stop3. Compare the value of CT sensor with another measurement device4. Check whether OLP trip is occurred5. Replace the relevant compressor


Vacuum Mode : Tact S/W K1

K1 8 times Vacuum mode (Main) “K” “5” “M“ “BLANK“

K1 9 times Vacuum mode (Sub1) K” “5” “S“ “1“



K1 12 times Vacuum mode (All) “K” “5” “A” “BLANK”

In vacuum mode, 1. System operation is prohibited.2. System does not execute both self diagnosis and protection control.

Outdoor EEV Liq. EEV Valves 4way Valve

Fully open Fully open Open Cooling mode

ActionOutdoor Units with vacuum mode set

Outdoor Units with normal mode set

Outdoor EEV Liq. EEV Valves 4way Valve

Fully Closed Fully Closed Closed Cooling mode

7-Segment display


Pump down Mode : Tact S/W K2

1. Close the liquid service valve of all units2. Press Tact S/W K2 3 times3. System start the pump down operation4. Outdoor unit that pump down is ended stops operation5. Close the gas service valve in order that operation stops

How to pump down all units

K2 3 times Pump down (All Unit) “K” “7” “BLANK“ “BLANK“

K2 3 times Pump down (Main) “K” “7” “M“ “BLANK“

K2 3 times Pump down (Sub1) “K” “7” “S“ “1“



7-Segment display

※ Pump down operation under long pipe installation is NOT desirable. Please Use adequate refrigerant recovery device.


K1 3 times Pump out Main “K” “3” “M“ “BLANK“

K1 4 times Pump out Sub1 K” “3” “S“ “1“



Pump out Mode : Tact S/W K1 7-Segment display

1. Close the liquid service valve of Sub1 unit2. Press Tact S/W K1 4 times3. Sub1 Unit start the pump out operation4. Check low pressure in view mode(K4 S/W) ; Do not operate system under 1.6kgf/ ㎠ G (L.P.)5. Close the gas service valve6. Press K3 to reset the system

How to pump out Sub1 unit (example)


S/W K6 K7 K8

On

Digital comp1_mainFixed comp1_sub1Fixed comp1_sub2

Normal

Fixed comp2_mainFixed comp2_sub1Fixed comp2_sub2

Normal


Normal

Off

Digital comp1_mainFixed comp1_sub1Fixed comp1_sub2

Disbranch


Disbranch


Disbranch

Disbranch breakdown compressor : DIP S/W K6, K7, K8 ※ Should be set in individual unit

Sub1

Fixed comp.2 is broken

How to Disbranch Compressor Sub1 unit (example)1. Set DIP S/W K6 ON, K7 OFF of Sub1 Unit2. Press K3 to reset the system

※ It is temporary expedient and service is needed for long term operation


Monitoring Program : S-NET I+

Documents

1. Error Display 1) The Meaning of the First Alphabet