LG Therma V AHBW A0 Series Service Manual
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LG Therma V AHBW A0 Series Service Manual

General svc manual
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GENERAL SVC MANUAL
MODEL : AHBW***A0
AHBW036H0
CAUTION
Before servicing the unit, read the safety precautions in general SVC manual.
Only for authorized service personnel.

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Summary of Contents for LG Therma V AHBW A0 Series

  • Page 1 Internal Use Only http://biz.lgservice.com System GENERAL SVC MANUAL MODEL : AHBW***A0 AHBW036H0 CAUTION Before servicing the unit, read the safety precautions in general SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    1. Checking Key Components of Unit 2. Checking Key Components of Outdoor Unit 3. Self-Diagnosis Feature 4. Trouble Shooting Guide - 2 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precaution

    • The falling outdoor unit can cause • There is risk of fire or eletric shock. damage or injury or even death of a person. - 3 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 4 • If power is not supplied, some spe- cial product-protecting actions (such as water pump anti-locking) will not performed. - 4 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 • Otherwise it can be harmfull for frostbite (cold burn) an excessively high pressure your health. results, causing equipment damage or injury. - 5 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 Use a firm stool or ladder when cleaning, maintaining or repair- ing the product at an height. • Be careful and avoid personal injury. - 6 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 2.2 Outdoor Unit ............13 3. Combination of Outdoor Units ........14 4. Nomenclature..............15 4.1 Indoor Unit .............15 4.2 Outdoor Unit ............15 - 7 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Model Information

    : Tested under Eurovent Heating condition (Inlet water temperature 23 ℃ → 18 ℃ at outdoor ambient temperature 35 °C / 24 °C) - 8 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: External Appearance

    External Apprearance 2. External Apprearance 2.1 Unit UN3 chassis UN4 chassis - 9 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 External Apprearance UN4 chassis - 10 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Part 2 : Features & Controls

    Part 2 Features & Controls - 11 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: List Of Function

    O : Applied, X : Not applied, – : No relation * Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 12 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 O : Applied, X : Not applied, – : No relation * Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 13 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 O : Applied, X : Not applied, – : No relation * Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 14 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 O : Applied, X : Not applied, – : No relation * Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 15 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Features

    Indoor temp. or Water temp. (Optional temp. setting) ※ Some functions may not be operated and displayed depending on the model. - 16 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Silent Mode ON / OFF Slight Trouble Thermostat Water Tank Temp. Heavy Trouble Electric Heater (1) Solar Heating Temp. Electric Heater (2) Defrost - 17 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 . To release this setting, pressing function setting button until icon flash and then enter setting/clear button. - 18 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 • If necessary, enable or disable of screed drying can be programmed according to userʼs setting. • While the screed drying mode is operating, “Dry” is displayed. - 19 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 • Whenever adjusting DIP switch, turn off electric power supply to avoid electric shock. General information OFF is selected ON is selected - 20 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Selecting electric heater capacity Electric heater is not used Thermostat is NOT installed Thermostat installation information Thermostat is installed - 21 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 • Function Code 07 : Address setting When central controller is installed, address assigning is set by this function. - 22 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 - Value #1 : “01” Screed drying mode operating “00” Screed drying mode is not operating. - Value #2 : not used. - 23 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 • If Value #2 is set as ʼ00ʼ but FCU or 2way valve is NOT installed, the product can be operated abnormally. - 24 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 Function Code 24 or 25 Outdoor Value #1 of Value #2 of air temperature Function Code 23 Function Code 23 - 25 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 • To use disinfection mode, sanitary water heating should be enable. <Sanitary Water Heating Disable> <Sanitary Water Heating enable> - 26 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 If Value #1 is set as ʻ1ʼ, then electric heater is never turned on and only water heater is on and off according to control logic. - 27 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Test Run

    2.0 MΩ as a result of refrigerant accumulation in the internal compressor. If the insulation resistance is less than 2.0 MΩ, turn on the main power supply. - 28 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 (comp.,fan, others ) to Heating mode Is hot water discharged ? Refer to Troubleshooting After hot start Guide Normal - 29 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Part 3 Replacement

    Part 3 Replacement - 30 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Replacement Procedure For Compressor

    If recovery unit is used, charge refrigerant. When inserting the sound proof, be sure to insert counter-clockwise. < Figure 2 > Discharge pipe Suction pipe - 31 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Replacement Procedure For Inv Pcb

    Confirm that there is no gap between INV PCB case and control case. (Figure 4.) If any gap is present, it will cause product malfunction. - 32 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Caution For Assembling Outdoor Panels After Test Run

    If screws are not assembled, it allows rain come into control box causing defect of unit. - 33 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 Caution for Assembling Outdoor Panels after Test Run - 34 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Part 4 : Trouble Shooting

    Part 4 Trouble Shooting - 35 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 1.7 Electronic Expansion Valve ..............43 2. Self-Diagnosis Feature..............46 2.1 Concept of ʻClassified Troubleʼ ...............46 2.2 Error Code List..................47 3. Trouble Shooting Guide ..............49 - 36 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Checking Key Components Of Unit

    • Check the air vent. If there is air in the unit, it can display “CH14”. Please remove the air by using the air vent. - 37 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: Water Pump

    PCB is in trouble. In this case, contact official After Service Center and replace the unit PCB. • To correct wrong wiring, please refer Ⓐ. - 38 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Electric Heater

    If the reason of malfunction is clearly proved as the defect of the electric heater itself, then replace it with new one. - 39 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Remote Controller

    Unless 2nd and 3rd pin of DIP switch setting is 01(OFF-ON) or 10(ON-OFF), the water tank heating will not be configured. - 40 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Compressor

    (when measuring absolute values). Accurate measuring values cannot be obtained with a general portaable tester (For analog and digital mode). - 41 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Fan Motor

    3. If problems continue to occur even after counter- measure of No.1 and No.2, it means that both boards has defect. - 42 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Electronic Expansion Valve

    Full open EEV noise. open 1350 pulses - If liquid refrigerant is in EEV, the noise is lower. pulse - 43 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 When the coil part is removed or assembled, be careful not to bend the pipe of the body. A part - 44 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 (brown-white, brown-yellow, brown-orange, brown-blue) 2. If the estimated resistance value is in 150 ± 10 Ω then the EEV is normal - 45 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Self-Diagnosis Feature

    - But in emergency operation, automatic re-start is prohibited to protect the product. - Therefore, user must restart the product after power reset when emergency operation has been running. - 46 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Error Code List

    Slight / Heavy / Option Troubles : lowercases ʻchʼ + code no. - Errors : capital letters ʻCHʼ + code no. - 47 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 Before conducting a checking or repairing job, pull out the plug out of the outlet and make sure that the lamp on the control board outdoor unit is off. - 48 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: Trouble Shooting Guide

    Change the PCB Unplugged Plugged 10 kΩ 2.5 V DC Check the resistance Check the voltage - 49 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 Installer Setting Modeʼ at the control panel. If not, system will NOT be operated correctly. It is STRONGLY recommended to keep above instruction. - 50 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 Main PCB 1 fault Replace after checking ❊ CH05 is displayed at unit, CH53 is displayed at outdoor unit. - 51 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 • This error can not be permitted damage a the EEPROM n Error diagnosis and countermeasure flow chart - Replace the main PCB 1 - 52 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 • Check the air vent. If there is air in the unit, it can display “CH14”. Please remove the air by using the air vent. - 53 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only...
  • Page 54 • Wait while room air is heated by target Leaving water temperature of thermostat. temperature is higher than 62 °C - 54 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 • Room air is not fully heated by under floor than 90 °C heating. • Wait while room air is heated by target temperature of thermostat. - 55 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 DC300V DC380V AUUW606D DC300V DC380V 3 Phase AUUW368D DC540V DC500V AUUW428D DC540V DC680V AUUW488D DC540V DC680V AUUW608D DC540V DC680V - 56 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Check inverter PCB assembly IPM normality Is inverter PCB assembly ’ Replace inverter PCB assembly normal? Recheck power and installation condition - 57 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? ’ Replace inverter PCB assembly Recheck power and installation condition - 58 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 Is inverter PCB assembly normal? Replace inverter PCB assembly Recheck power and installation condition Measuring input voltage Noise filter wiring - 59 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 Check Pressure of discharge pipe Is it normal ? Re-vaccuming system and Re-charging Change main PCB 2 - 60 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Non operating Operating 1 Phase AUUW126C DC300V DC280V AUUW186C DC300V DC280V AUUW246D DC300V DC380V AUUW306D DC300V DC380V AUUW366D DC300V DC380V - 61 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Check inverter PCB assembly IPM normality Is inverter PCB assembly ’ Replace inverter PCB assembly normal? Recheck power and installation condition - 62 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 63 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 Is it normal (4.0 V DC )? Change Main PCB Check TRANS Is it normal? Change TRANS Change main PCB - 64 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 4.5 V DC at 25 ℃ Change the sensor Repair or Change the PCB. Estimate the resistance of each sensor. - 65 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 / 5 kΩ at 25 °C ? Change the sensor Plug the sensor on main PCB 1 Check the resistance Check the voltage - 66 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 Check PCB Check Flow Chart (CH60) Check the the connection port. Is it normal ? Correct connection Change EEPROM - 67 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 Replace inverter PCB Check point - Check the transmission connector and LED (Main & Inverter) <Inverter PCB> <MAIN PCB 2> - 68 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 Change the sensor Is it normal ? Correct connection Repair or Change the PCB. Estimate the resistance of each sensor. - 69 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? → Replace inverter PCB assembly Recheck power and installation condition - 70 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 0.542 0.63 0.459 1.25 0.469 0.54 0.397 1.07 0.406 0.46 0.345 0.92 0.353 0.79 0.307 0.34 0.262 0.68 0.268 - 71 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 18.89 2.561 1.26 2.28 14.79 2.255 1.07 2.09 11.72 1.972 0.92 1.716 1.73 7.62 1.487 0.69 1.57 6.24 1.287 - 72 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 More than 2M‰ AHBW076A0 0.997 0.980 0.965 V-GND More than 2M‰ AHBW056A0 0.997 0.980 0.965 W-GND More than 2M‰ - 73 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 Trouble Shooting Guide - 74 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 APRIL, 2013 P/NO : MFL58346405...

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