LG AH-W096A0 Service Manual Download Page 77

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LGE Internal Use Only

Trouble Shooting

41
47

45
46

D-pipe sensor(Inv)

D-pipe sensor(Cons)

Air sensor

Condenser Pipe sensor

Suction Pipe sensor

Heat sink

sensor

• Connector connection error
• Faulty PCB
• Faulty sensor (Open / Short)

• Normal resistor : 200K

Ω

/ at 25˚C (Unplugged)

• Normal voltage : 4.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.

• Normal resistor : 10K

Ω

/ at 25˚C (Unplugged)

• Normal voltage : 2.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.

• Normal resistor : 5K

Ω

/ at 25˚C (Unplugged)

• Normal voltage : 2.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.

• Normal resistor : 5K

Ω

/ at 25˚C (Unplugged)

• Normal voltage : 2.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.

Display

code

Title

Cause of error

Check point & Normal condition

Ω

10k

Ω

Unplugged

Plugged

Check the resistance

Check the voltage

2.5Vdc

Unplug the sensor

on Indoor unit PCB

Estimate the Voltage

of each sensor.

Is the voltage of the

sensor is 4.5Vdc /

2.5Vdc at 25˚C

Repair or Change the PCB.

Check the

Connector connection

Is it normal ?

Estimate the resistance

of each sensor.

Plug the sensor

on Indoor unit PCB

Is the resistance of the

Sensor is 200k

Ω

/10k

Ω

⁄

/5k

Ω

at 25˚C?

Yes

No
Correct connection

Yes

No
Change the sensor

Check Flow Chart

Summary of Contents for AH-W096A0

Page 1: ...System SVC MANUAL CAUTION Before servicing the unit read the safety precautions in general SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com MODEL AH Series ...

Page 2: ...ation 2 External Appearance Part 2 Features Controls 1 List of Function 2 Features 3 Control Logic 4 Test Run Part 3 Replacement 1 Replacement procedure for Compressor 2 Replacement Procedure for INV PCB 3 Caution for Assembling Outdoor Panels after Test Run Part 4 Trouble Shooting 1 Checking Key Components of Indoor Unit 2 Checking Key Components of Outdoor Unit 3 Self Diagnosis Feature 4 Trouble...

Page 3: ... indicates the possibility of death or serious injury This symbol indicates the possibility of injury or damage to properties only Be sure not to do Be sure to follow the instruction WARNING Installation Do not use a defective or underrated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock For electrical work contact the dealer seller a qualified ele...

Page 4: ...tand It may cause injury accident or damage to the product Be sure the installation area does not deteriorate with age If the base collapses the product could fall with it causing property damage product failure and per sonal injury Do not let the product run for a long time when the humidity is very high and a door or a window is left open Moisture may be condensed and wet or damage furniture Tak...

Page 5: ...ow in storm or hurricane If possible remove the product from the window before the hurri cane arrives There is risk of property dam age failure of product or elec tric shock Do not open the front cover of the indoor unit while operation Do not touch the electrostatic filter if the unit is so equipped There is risk of physical injury electric shock or product fail ure When the product is soaked flo...

Page 6: ...iger ant leakage after installation or repair of product Low refrigerant levels may cause fail ure of product Do not install the product where it will be exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation Keep level even when installing the product To avoi...

Page 7: ...e or loss of prop erty Do not block the outlet of air flow It may cause product failure Use a soft cloth to clean Do not use harsh detergents solvents etc There is risk of fire electric shock or damage to the plastic parts of the prod uct Do not step on or put anything on the product outdoor units There is risk of personal injury and fail ure of product Do not insert hands or other objects into th...

Page 8: ...d service purposes LGE Internal Use Only Part 1 General Information 1 Model Names 11 1 1 Indoor Unit 11 1 2 Outdoor Unit 11 2 External Appearance 12 2 1 Indoor Unit 12 2 2 Outdoor Unit 13 3 Combination of Outdoor Units 14 4 Nomenclature 15 4 1 Indoor Unit 15 4 2 Outdoor Unit 15 ...

Page 9: ...tion water temperature 30 C 35 C at outdoor ambient temperature 7 C 6 C 2 tested under Eurovent Cooling condition water temperature 23 C 18 C at outdoor ambient temperature 35 C 24 C Model number nomenclature Model name and related information A H W 0 9 6 A 0 Series Number Chassis Name Electrical ratings 6 1 phase 220 240V AC 50Hz 8 3 phase 380 415V AC 50Hz Heating Capacity kW 09 9kW 12 12kW 14 14...

Page 10: ...kg Sanitary Water Tank Type Field Supply Heater Capacity kW Power Supply Ø V Hz Power Supply Type Thermal Protector Range C Relay Contactor ELB A Sensor Adaptor Diameter mm inch Accessory Kit AHNW096A0 AHNW126A0 AHNW146A0 AHNW166A0 H09SNE H12SNE H14SNE H16SNE AHUW096A0 AHUW126A0 AHUW146A0 AHUW166A0 Combination Outdoor Units Indoor Units 135 205 205 205 0 59 0 89 0 89 0 89 6 30 6 30 6 30 6 30 16 30...

Page 11: ...oling dB A 3 Level Heating dB A 3 Liquid Piping Type Connection Outer Diameter mm inch Gas Piping Type Connection Outer Diameter mm inch Piping Length Minimum m Outdoor Unit Standard m Indoor Unit Maximum m Height Difference Maximum m Outdoor Unit Indoor Unit Additional Refrigerant Charge g m Dimensions Unit W x H x D mm Packed Unit W x H x D mm Weight Unit kg Packed Unit kg AHUW096A0 H09SNE AHUW1...

Page 12: ...08 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only External Apprearance 2 1 Outdoor Unit 2 2 Indoor Unit 2 External Apprearance AH W096A0 AH W126A0 AH W146A0 AH W166A0 ...

Page 14: ...ion indicator PI 485 Special function kit Zone control CTIE Electro thermostat Others Remote room temperature sensor TH8 AWHP Anti Condensation on floor cooling Water Pump ON OFF Control Flow Switch Control Thermostat Interface 230V AC Thermostat Interface 24V AC Sanitary Tank Heating Solar Thermal Interface with Sanitary Tank PHEX Anti Freezing Control Water Pump Forced Operation Autosetting acco...

Page 15: ... Emergency Control 1 2 Easy Setting Feature Slight trouble Heavy trouble Indoor temp or Water temp Optional temp setting Solar source temp Hot water temp Outlet water temp Inlet water temp Indoor temp Easy checking of system failure Slight Heavy trouble Emergency operating Heavey trouble Electric heater ON Secure at least heating before A S 2 Features ...

Page 16: ...r Button Function Setting Button Temperature Setting Mode Button Temperature View Mode Button Programming Button Set Clear button Display Panel Cooling Heating Weather dependent Heating Space Temp Water Inlet Temp Water Outlet Temp Central Controller Thermostat Electric Heater 1 Electric Heater 2 Water Tank Electric Heater Water Pump Solar Heating Pump Water Tank Heating Enable Disable Water Tank ...

Page 17: ...en to not to use the AWHP carelessly CL is an abbreviated form of Child Lock 2 Special Function Press Function Setting Button to enter user setting mode The segment will be flashed 1 Press set clear button to finish the selection The segment will be disappear 2 During Child Lock icon and CL will be displayed during 3 seconds whenever entering any kind of buttons except for view temperature button ...

Page 18: ...pliance is operating at the time set by the timer the operation continues 2 3 2 Off Timer Operation When the set time is reached after the time is input by the control panel the appliance stops operating The timer LED is on when the off timer is input It is off when the time set by the timer is reached If the appliance is on pause at the time set by the timer the pause continues 2 4 Weekly Program...

Page 19: ...tion environment it is important to set up system correctly If not configured correctly improper operation or degrade of performance can be expected 3 1 DIP Switch Setting Turn off electric power supply before setting DIP switch Whenever adjusting DIP switch turn off electric power supply to avoid electric shock General Information 1 2 3 4 5 6 7 8 OFF ON OFF is selected ON is selected ...

Page 20: ...3 Indoor unit Outdoor unit Sanitary water tank Solar thermal system is installed 1 2 3 Emergency operation Level 4 4 High temperature cycle Low temperature cycle External water pump installation information 5 External water pump is NOT installed 5 External water pump is installed 4 5 Selecting electric heater capacity 6 7 Full capacity is used 6kW except AH W096A0 4kW for AH W096A0 Electric heater...

Page 21: ... information should be notified to the product Note If remote air sensor is connected but this function code is not set correctly the product can not be con trolled by room air temperature Function Code 04 Celsius Fahrenheit Switching Temperature is displayed in Celsius or Fahrenheit Function Code 05 Setting Temperature Selection The product can be operated according to air temperature or leaving ...

Page 22: ...onment do not set leaving water temperature below 18 C Water condensation on the radiator While cooling operation cold water may not flow to the radiator If cold water enters to the radiator dew gener ation on the surface of the radiator can be occurred Function Code 13 Setting Air Temperature in Heating Mode Determine heating setting temperature range when air temperature is selected as setting t...

Page 23: ...or air temperature is below 4 C 4 Value 1 Value 2 and current leaving water temperature or room air temperature is far much belower than target leav ing water temperature or target room air temperature Function Code 22 Setting Cut off Temperature in Cooling Mode FCU setting included Determine leaving water temperature when the product is turned off This function is used fr preventing condensa tion...

Page 24: ...and Value 2 of Function Code 23 range of outdoor air temperature Value 1 and Value 2 of Function Code 24 range of auto adjustable target room air temperature Value 1 and Value 2 of Function Code 25 range of auto adjustable target leaving water temperature Note Weather dependent operation is applied for heating mode only Value 1 of Function Code 23 Auto Adjustable Target Temperature Outdoor air tem...

Page 25: ...get temperature of disinfection mode Value 2 of Function Code 27 Duration of disinfection mode Vales of Function Code 26 If Value 1 of Function Code 26 is set as 00 that is disable disinfection mode Value 2 and Value 3 is not used When Value 1 is set as 01 that is enable disinfection mode Value 2 is displayed at the position of Value 1 and Value 3 is displayed at the position of Value 2 It is due ...

Page 26: ...below 70 C Example If Value 2 is set as 0 that means heating priority is on sanitary water heating sanitary water is heat ed by AWHP compressor cycle and water heater In this case the under floor can not be heated while sanitary water heating On the other hand if the Value 2 is set as 1 that means heating priority is on under floor heat ing sanitary tank is ONLY heated by water heater In this case...

Page 27: ...ervice purposes LGE Internal Use Only Control logic 3 Control logic 1 Compressor 29 2 Step frequency control 30 3 Reversing valve operaton 33 4 Discharge pipe control 34 5 Input Current Control 35 6 Outdoor Fan Control 37 7 Defrost Control 38 8 EEV Control 39 9 Heat sink control 41 ...

Page 28: ...ng the working frequency of the compressor Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM intelligent power module Switching speed of IPM defines the variable frequency input to the motor 1 Compressor BLDC Motor IPM Inverter EMF MCU 16Bits U V W U V W X Y Z Position Detect Circuit 120 f P RPM f P RPM Revolutions Minute Frequency N...

Page 29: ... logic 1 2 Inverter compressor starting Target Frequency calculation method Step A Step 1 Frequency Min frequency 20 25Hz Step B Step A Target Frequency 2 Step C Step B Target Frequency 2 Step D Step C Target Frequency 2 Step E Step D Target Frequency 2 Target frequency Hz Step A Step B Step C Step D Time sec Step E frequency ...

Page 30: ...iping x Step_TAO x step_TW x step_DTR step_OP_ind 2 Between formular 1 and 2 only one formular is applied by system setting If target frequency step Step base exceeds maximum step the Step base value follows the maximum step value The compressor get the minimum step in case Step base value is lower than the minimum step of operating capacity 2 Step frequency control System ON Setting Indoor data O...

Page 31: ...Internal Use Only 2 3 Setting value Cooling Step TAO step compensation by Outdoor temp Step TW step compensation by Inlet water temp Step DTW Step Compensation of temperature difference between Inlet water temp and setting temp 10 30 38 41 45 Temp C 100 110 120 Working ratio 5 13 24 34 85 100 Working ratio Temp C ...

Page 32: ...Use Only Control logic 2 4 Setting value Heating Step TAO step compensation by Outdoor temp Step TW step compensation byInlet water temp Step DTW Step Compensation of temperature difference between Inlet water temp and setting temp 18 4 10 Temp C 100 148 Working ratio 3 28 46 Temp C 100 113 Working ratio 32 57 ...

Page 33: ... 4 Method of changing mode from defrosting to heating As the defrosting is finished inverter compressor frequency is lowered to 30Hz for 10 sec And the valve is ON for the heating mode 5 If the operating mode is changed to heating from cooling 3 min restarting rule is applied and reversing valve position is changed within 30 sec after compressor turns OFF 6 If the compressor is stopped during heat...

Page 34: ...Compressor frequency stop increasing Expansion valve up by ß pulse T2 discharge pipe temperature Toff Hysteresis control Compressor frequency down by a pulse Expansion valve up by ß pulse in every 30 second If EEV is in the starting control it will follow starting control first 3 Discharge pipe temperature Toff then compressor will be OFF and System will stop if this situation occurs 10 times in 1...

Page 35: ...f operation cooling heating then turn off the compressor 2 After step down still if the total current exceed CT1 for more than 5 sec then step down inverter operation by 1 more step 3 If the current continue below CT1 for more than 1 min return the to setting step Hz CT 2 detection 1 If total current exceeds CT2 turn off compressor And after 3 min turn on the compressor and check the current again...

Page 36: ...outdoor temperature 1 DC motor fan control 6 Outdoor Fan Control Model RPM Base Step Max Step Min Step AHUW166A0 670 700 200 Outdoor Temperature Cooling Step Outdoor Temperature Heating Step 41 45 C Base Step 2 22 26 C Base Step 4 38 41 C Base Step 1 18 22 C Base Step 3 28 38 C Base Step 14 18 C Base Step 2 24 28 C Base Step 2 10 14 C Base Step 1 18 24 C Base Step 4 4 10 C Base Step 14 18 C Base S...

Page 37: ...fan works in ON OFF control If the pipe temperature T1 and it is falling rapidly in that case compressor will run for 5 min then it will go in low ambient control After the system is stopped by CT cut or heat sink cut off cycle will return to the normal operating control T pipe Cond Out Outdoor fan Setting value Setting value Off Off T2 C T1 C 11 C 6 C AHUW166A0 T2 C T1 C Model ...

Page 38: ...signal of defrost completion in case of meeting one of the condition as below 1 Defrosting time 7 minutes 2 Piping temperature maintain 10 seconds Option in condition of more than 12 C Option 7 4 Defrosting Control Algorithm 7 Defrost Control Satisfy Defrost Start Condition Satisfy Defrost End Condition Defrost Start Heating Start Defrost flag clear Inverter Comp Outdoor Fan Hot gas bypass Indoor ...

Page 39: ...arting 3 Time constant control period of EEV is every 2 minutes except below conditions Control EEV every 1 minutes for 10 minutes after starting Control EEV every 1 minutes for 10 minutes after starting in case of the special situation such as defrost completion oil supplying current transformer limitation limitation of discharge temperature low ambient operation control 8 EEV Control Time consta...

Page 40: ...unit is ON additionally is operated with target opening of EEV 3 The indoor units which are in the middle of starting control are continuing starting control with the opening of its opening 4 Urgent control by indoor piping temperature 1 EEV open 4 pulse with every 10 sec when the indoor piping temperature is below 2 C 2 When the temperature reaches 4 C system return to the starting control pulse ...

Page 41: ...pressor frequency b Heat sink temperature T2 Compressor frequency fixed c T2 heat sink temperature Toff Compressor frequency down by a Hz in a minute d Heat sink temperature Toff Compressor will be off System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will start If high temperature situation occurs 5 times in 1 hr system counts 1 error...

Page 42: ...en power supply terminal block and ground Do not operate in the case of 2 0 MΩ or less NOTE Never carry out mega ohm check over terminal control board Otherwise the control board may break Immediately after mounting the unit or after leaving it turned off for an extended length of time the resistance of the insulation between the power supply terminal board and the ground maydecrease to approx 2 0...

Page 43: ... in cooling mode Does Test operation start Refer to part4 6 Electric part Yes No Yes Refer to part4 5 Cycle part No Is hot water discharged After Hot Start Yes No Is there any temperature difference between intake and discharged water Yes No Is the operating current normal Yes Normal Refer to Troubleshooting Guide No Check the load In Out Temp Check pipe length and amount of refrigerant Check for ...

Page 45: ...re 1 4 Install the new compressor in the unit Be sure to insert the cushion rubbers before tightening the fixing nut of compressor 5 Remove the rubber caps put on the suction and discharge pipe of the new compressor to release the sealing nitrogen gas 6 Braze the suction and discharge pipe with brazing torch to the compressor 7 Conduct air tight test to check the piping system is free from leakage...

Page 46: ...unscrewing 4 screws Figure 2 3 Replace INV PCB assembly Figure 3 When assemble INV PCB assembly with control case make sure that PCB case is inserted surely in the slit of control case 4 Assemble panel assembly and main PCB Figure 2 1 Figure 2 2 Figure 3 1 Figure 3 2 Figure 4 Figure 1 CAUTION Be sure that INV PCB assembly is firmly assembled with control case Confirm that there is no gap between I...

Page 47: ... performance of the unit would be decreased CAUTION After replace the INV PCB assembly make sure that connection of fan motor wires is correct When assemble the outdoor panels after replacement make sure that screws of top panel are assembled as shown figure below If screws are not assembled it allows rain come into control box causing defect of unit Main PCB Case to Fan moter Fan motor wire termi...

Page 49: ...1 2 Water Pump 51 1 3 Electric Heater 52 1 4 Control Panel 53 2 Checking Key Components of Outdoor Unit 54 2 1 Compressor 54 2 2 Fan Motor 55 2 3 Electronic Expansion Valve 56 3 Self Diagnosis Feature 59 3 1 Concept of Classified Trouble 59 3 2 Error Code List 60 4 Trouble Shooting Guide 62 3 1 Concept of Classified Trouble 63 3 1 Concept of Classified Trouble 64 Trouble Shooting ...

Page 50: ...w It is due to electrically open of flow switch or the contact of flow switch is mechanically broken Contact official After Service Center and replace the flow switch Read Checking Key Components of Indoor Unit Water Pump carefully to get more detail information Contact official After Service Center and replace the water pump Also check the water quality if there are particles that can yield locki...

Page 51: ...g at the water pump To correct Indoor unit PCB s making control signal first check the signal level Use electric voltage meter and measure voltage at CN_W PUMP A connector on the indoor unit PCB If measured value is not 220V 240V AC while Water Pump Operating Icon is displayed at control panel the indoor unit PCB is in trouble In this case contact official After Service Center and replace the indo...

Page 52: ...nd port 6 Neutral with voltage meter The measured value should be 220V 240V AC Start A YES YES NO Electric heater working time is not enough YES NO B Electric power is not supplied NO C YES Thermodisk is not correctly working NO D ELB cuts off power or ELB trouble NO E YES NO YES Relay contactor is not working correctly Electric heater is not normal F Electric heater is working External electric p...

Page 53: ...ured exactly you can see Thermostat Icon at the display of the control panel It is normal condition that power button of control panel does not work when thermostat is installed It is normal condition Basically two features can be operat ed without user s decision one is system protective opera tion the other is background water tank heating operation which is heating inside the water tank while s...

Page 54: ...irtually same values appear actually or where there is danger to determine that fail ure of the inverter occurred 2 You can use rectification voltmeter if using commercial frequency tester when measuring output values of the inverter when measuring absolute values Accurate measuring values cannot be obtained with a general portaable tester For analog and digital mode 1 2 How long is power on durin...

Page 55: ...tus 2 Check contact of the connector 3 Check that parts are firmly secured by tightening screws 4 Check connection of polarity 5 Check short circuit and grounding Measure winding resistance of the motor coils Replace the circuit board in following procedures if problems occur again when powering on and if there are no matters equivalent to items as specified in above 1 through 4 Carefully check bo...

Page 56: ...ferent or continuously in the ON state motor will not operate smoothly and start vibrat ing EEV valve operation ø1 ON OFF OFF OFF OFF OFF ON ON ø2 ON ON ON OFF OFF OFF OFF OFF ø3 OFF OFF ON ON ON OFF OFF OFF ø4 OFF OFF OFF OFF ON ON ON OFF Output ø No Output state 1 2 3 4 5 6 7 8 Valve open Angle close pulse open Full open 1350 pulses At power ON open angle signal of 1400 pulses out put and valve ...

Page 57: ...ternal Use Only Checking Key Components of Outdoor Unit EEV Coil and body Outdoor unit Remove and assemble the coil Lead wire Coil part Body A part Remove Assemble Grip the A part tightly and pull up coil part upward When the coil part is removed or assembled be careful not to bend the pipe of the body ...

Page 58: ...ection 1 Check the resistance between coil terminal red white red yellow red orange red blue 2 If the estimated resistance value is in 52 3Ω then the EEV is normal Replace EEV Outdoor unit 1 Check the resistance between coil terminal brown white brown yellow brown orange brown blue 2 If the estimated resistance value is in 150 10Ω then the EEV is normal Replace EEV Indoor unit 1 Operate indoor uni...

Page 59: ...ble Trouble is classified two levels according to the seriousness of the problem Slight Trouble and Heavy Trouble Slight Trouble a problem is found inside the indoor unit In most case this trouble is concerned with sensor problems The outdoor unit is operating under emergency mode operation condition which is configured by DIP switch No 4 of the indoor unit PCB Heavy Trouble a problem is found ins...

Page 60: ...utdoor 06 Problem in Refrigerant Outlet side sensor O Indoor 08 Problem in Water Tank sensor O Water Tank 09 PCB Program EEPROM Fault O Indoor 13 Problem in Solar thermal sensor O Indoor 14 Problem in Flow Switch O Indoor 15 Water pipe overheated O Indoor 16 Problems in sensors O Indoor 17 Problem in Water inlet sensor O Indoor 18 Problem in Water outlet sensor O Indoor 19 Problem in Water interli...

Page 61: ... Checksum mismatched O Outdoor 61 Temperature at condenser pipe is too high O Outdoor 62 Temperature at heatsink is too high O Outdoor 63 Temperature at condenser pipe is too low O Outdoor 65 Problem in heatsink temperature sensor O Outdoor 73 Instant over current input O Outdoor 1 time 2 times 3 times 4 times 5 times 6 times 7 times 8 times 9 times 2 times none 1 time 4 times 5 times 6 times 2 ti...

Page 62: ...ection between sensor and PCB PCB fault Sensor fault Resistance 10k ohm at 25 centigrade unplugged for Remote Room Air sensor Resistance 5k ohm at 25 centigrade unplugged for all sensors EXCEPT Remote Room Air sensor Voltage 2 5Vdc at 25 centigrade plugged for all sensors Refer resistance temperature table to check in different temperature Code No Description Cause Normal Condition Ω 10kΩ Unplugge...

Page 63: ...iagnosis and countermeasure flow chart Replace the control panel Replace indoor unit PCB Yes Yes No No Does the error occur again when the control panel is replaced Does the error occur again when the cable between control panel and PCB is replaced Check if the wire is connected tightly and also check wire itself After replacing the control panel or indoor unit PCB it is very important to perform ...

Page 64: ...in power supply at the ODU terminal block Improper connection of power supply cable Main power supply problem Yes No Yes No Outdoor PCB fault Replace after checking Re connect transmission cable No Yes Indoor PCB fault Replace after checking Check the insulation of inverter Check the capacity of main circuit breaker and replace if required If all ok Turn on main circuit breaker Replace outdoor PCB...

Page 65: ...nly for training and service purposes LGE Internal Use Only 09 PCB Program EEPROM Fault Code No Description Cause Normal Condition Electrical or mechanical damage a the EEPROM This error can not be permitted Error diagnosis and countermeasure flow chart Replace the indoor unit PCB ...

Page 66: ...ox at the water pump of water pump and feel if the water pump is vibrating If no vibration the water pump is not operating Also you can see Water Pump Operating Icon at control panel Although there is not water flow inside water circuit the flow switch detects as if water is flowing It is due to electrically closed or short of flow switch or the contact of flow switch is mechanically stuck Contact...

Page 67: ...aving water temperature is 62 C Start END it is normal condition A A B B NO YES YES YES YES NO NO Leaving water temperature is higher than target water temperature Thermostat is installed Leaving water temperature is higher than 62 C This is unexpected case Turn off the system and call service center If the system is not turned off before it yields error code CH15 very hot leaving water will be ge...

Page 68: ... to comp check table Check the input power Outdoor Indoor unit Is it normal Yes No Change Compressor Check Flow Chart Dc link voltage table Type Non operating Operating 1 Phase AUUW126C PSC DC300V 10 DC280V 10 AUUW186C PSC DC300V 10 DC280V 10 AUUW246D PFC DC300V 10 DC380V 10 AUUW306D PFC DC300V 10 DC380V 10 AUUW366D PFC DC300V 10 DC380V 10 AUUW426D PFC DC300V 10 DC380V 10 AUUW486D PFC DC300V 10 DC...

Page 69: ...ge Compressor Check the electricity leakageof the compressor Refer to comp check table Check the input power Outdoor Indoor unit Is it normal Yes No Change Compressor Check Flow Chart Dc link voltage table Type Non operating Operating 1 Phase AUUW126C PSC DC300V 10 DC280V 10 AUUW186C PSC DC300V 10 DC280V 10 AUUW246D PFC DC300V 10 DC380V 10 AUUW306D PFC DC300V 10 DC380V 10 AUUW366D PFC DC300V 10 DC...

Page 70: ...0 AUUW246D PFC DC300V 10 DC380V 10 AUUW306D PFC DC300V 10 DC380V 10 AUUW366D PFC DC300V 10 DC380V 10 AUUW426D PFC DC300V 10 DC380V 10 AUUW486D PFC DC300V 10 DC380V 10 AUUW606D PFC DC300V 10 DC380V 10 3 Phase AUUW368D PSC DC540V 10 DC500V 10 AUUW428D PFC DC540V 10 DC680V 10 AUUW488D PFC DC540V 10 DC680V 10 AUUW608D PFC DC540V 10 DC680V 10 Model DC Link Voltage V CN_TRANS 1 23 28 DC Link Low voltage...

Page 71: ...connection No Re soldering component Yes No Open SVC Valve Is it normal Change main PCB Yes No Re vaccuming system Re charging Check Flow Chart CN_PRESS Switch Low pressure switch High pressure switch Spec 0 03 Mpa 4 3 Mpa Model AUUW126C AUUW246D AUUW186C AUUW306D AUUW366D AUUW426D AUUW486D AUUW606D AUUW368D AUUW428D AUUW488D AUUW608D Pressure switch table 24 Press S W Open Low High press S W open...

Page 72: ...ble Check the input power Outdoor Indoor unit Is it normal Yes No Change Compressor Check Flow Chart Dc link voltage table Type Non operating Operating 1 Phase AUUW126C PSC DC300V 10 DC280V 10 AUUW186C PSC DC300V 10 DC280V 10 AUUW246D PFC DC300V 10 DC380V 10 AUUW306D PFC DC300V 10 DC380V 10 AUUW366D PFC DC300V 10 DC380V 10 AUUW426D PFC DC300V 10 DC380V 10 AUUW486D PFC DC300V 10 DC380V 10 AUUW606D ...

Page 73: ... normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Yes Is input voltage normal No Check L N phase is 220V 15 Check connection condition and wiring if power is abnormal Yes Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly Are the resistance Between each phase and insulation resistance of Inverter compres...

Page 74: ...ion Error Between PFC Micom and INV Micom 1 Micom defect Circuit defect 2 Different Micom S W Version 3 ODU inverter PCB assembly damage Display code Title Cause of error Check point Normal condition Is Inverter PCB assembly normal No Replace inverter PCB assembly Is PFC Micom INV Micom S W Program normal No Upgrade Micom Program Yes Yes Recheck power and installation condition Check Flow Chart ...

Page 75: ...s it normal 230V 10 Change main PCB Check C01N Is it normal 4 0Vdc Check Check TRANS Is it normal Yes Yes Yes No Correct connection No Change Main PCB No Change TRANS Check Flow Chart TRANS C01N 40 C T Internal circuit Initial current error Malfunction of current detection circuit Open Short The voltage of C01N Is 4 0Vdc 25A Display code Title Cause of error Check point Normal condition ...

Page 76: ...ad Check the leakage of refrigerant Check the SVC V V open Refer to sensor resistance table Display code Title Cause of error Check point Normal condition Is the resistance of the sensor is 200kΩ at 25 C Plug the sensor on Indoor unit PCB Estimate the Voltage of each sensor Repair or Change the PCB Check Over load condition Refrigerant leakage Condenser is blocked Outdoor fan is locked Unplug the ...

Page 77: ...nplugged Normal voltage 2 5Vdc at 25 C plugged Refer to sensor resistance table Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Refer to sensor resistance table Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Refer to sensor resistance table Display code Title Cause of error Check point Normal condition Ω 10kΩ Unplugged Plugged Check the resi...

Page 78: ...mal Check PCB Change EEPROM Check the the connection port Is it normal Yes Yes No Correct connection No Correct connection Check Flow Chart CH51 Check Flow Chart CH60 51 60 Over capacity EEPROM Check sum Over capacity Combination Check sum error Check the indoor unit capacity Check the combination table Check the connection port Check the poor soldering Display code Title Cause of error Check poin...

Page 79: ...Filter 3 Defect of outdoor Main inverter PCB Display code Title Cause of error Check point Normal condition Error diagnosis and countermeasure flow chart Is transmission LED Yellow of inverter compressor PCB on Yes No Is noise filter or fuse normal Replace noise filter or fuse No Replace inverter compressor PCB Is transmission cable connected correctly Yes No Re connect transmission cable Is MAIN ...

Page 80: ...ltage of the sensor is 4 5Vdc 2 5Vdc at 25 C Yes Yes No Remove obstruction Change outdoor fan or motor Change refrigerant Yes Yes Yes No Change the sensor No Change the sensor No Correct connection Check Flow Chart 61 62 Condenser pipe sensor temp high Heat sink sensor temp high condenser pipe sensordetected high temp 65 C heat sink sensor detected high temp 85 C Check the load condition Check the...

Page 81: ... fan motor Check the DC Motor signal Is it normal Yes Yes No Remove obstruction No Correct connection Or re soldering PCB Is it normal Repair or Change the PCB Yes No Change Indoor Motor Check Flow Chart 67 BLDC motor fan lock Outdoor Fan motor break down Fan motor PCB poor contact Obstruction to the fan Check the indoor fan motor Check the connection status between PCB and fan motor Display code ...

Page 82: ...nnector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Is compressor Wire connection condition normal 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is AC i...

Page 83: ... 1 116 55 1 48 0 962 60 1 23 0 828 65 1 03 0 714 70 0 87 0 615 75 0 74 0 531 80 0 63 0 459 85 0 54 0 397 90 0 46 0 345 95 0 4 0 3 100 0 34 0 262 Pipe Temp B Constant 3977 Std Temp 25 Resistance 10 Temp Resistance Volt 30 204 35 4 72 25 146 97 4 62 20 107 09 4 492 15 79 4 336 10 58 95 4 149 5 44 47 3 931 0 33 9 3 685 5 26 09 3 416 10 20 27 3 131 15 15 89 2 838 20 12 55 2 546 25 10 2 262 30 8 03 1 9...

Page 84: ...55 2 96 3 32 60 2 47 3 11 65 2 07 2 9 70 1 74 2 69 75 1 48 2 48 80 1 26 2 28 85 1 07 2 09 90 0 92 1 9 95 0 8 1 73 100 0 69 1 57 Heatsink Temp B Constant 3500 Std Temp 25 Resistance 200 Temp Resistance Volt 30 2845 99 4 969 0 585 66 4 851 5 465 17 4 814 10 372 49 4 77 15 300 58 4 717 20 244 33 4 657 25 200 4 587 30 164 79 4 508 35 136 64 4 418 40 113 98 4 318 45 95 62 4 208 50 80 65 4 088 55 68 38 ...

Page 85: ...ore than 2MΩ All models V U W Ω Comp U V W 1 Phase AUUW126C 0 65 0 65 0 65 AUUW186C 0 65 0 65 0 65 AUUW246D 0 75 0 75 0 75 AUUW306D 0 75 0 75 0 75 AUUW366D 0 44 0 44 0 44 AUUW426D 0 44 0 44 0 44 AUUW486D 0 44 0 44 0 44 AUUW606D 0 44 0 44 0 44 3 Phase AUUW368D 1 84 1 84 1 84 AUUW428D 1 08 1 08 1 08 AUUW488D 1 08 1 08 1 08 AUUW608D 1 08 1 08 1 08 Model Resistance Ω at 20 Check resistance of the comp...

Page 86: ...P NO MFL58346401 September 2008 ...

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LG AH-W096A0, Service Manual

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