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

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Internal Use Only
http://biz.lgservice.com
System
GENERAL SVC MANUAL
MODEL : AHBW Series
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 Series

  • Page 1 Internal Use Only http://biz.lgservice.com System GENERAL SVC MANUAL MODEL : AHBW Series CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.
  • Page 2 AWHP Service Manual TABLE OF CONTENTS Safety Precautions..........................3 1. General Information........................7 2. Features and Controls........................10 3. Basic Contol ..........................36 4. Replacement..........................38 5. Trouble Shooting Guide ......................42...
  • Page 3 Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. WARNING This symbol indicates the possibility of death or serious injury.
  • Page 4 Prepare for strong wind or earthquake and Do not install the product on a defective in- install the unit at the specified place. stallation stand. • Improper installation may cause the unit to top- • It may cause injury, accident, or damage to the ple and result in injury.
  • Page 5 CAUTION n Installation Always check for gas (refrigerant) leakage Do not install the product where the noise or after installation or repair of product. hot air from the outdoor unit could damage the neighborhoods. • Low refrigerant levels may cause failure of •...
  • Page 6 n Operation Do not use the air conditioner in special Do not block the inlet or outlet. environments. • Oil, steam, sulfuric smoke, etc. can significantly • It may cause failure of appliance or accident. reduce the performance of the air conditioner or damage its parts.
  • Page 7 Part 1 General Information 1. Model Names ..............8 2. External Appearance ............8 3. Nomenclature..............9 - 7 -...
  • Page 8 1. Model Names Model name and related information Capacity Unit Power Source (Unit) Chassis Heating (kW)* Cooling (kW)** AHBW056A0 4.99 4.99 220-240 V~ 50 Hz AHBW076A0 7.00 7.00 220-240 V~ 50 Hz AHBW096A0 9.00 9.00 220-240 V~ 50 Hz AHBW126A0 12.00 14.50 220-240 V~ 50 Hz...
  • Page 9 Cycle compartment AHBW056A0/AHBW076A0/AHBW096A0 Description Name Remarks Entering water pipe PT 25.4mm(Female type) Leaving water pipe PT 25.4mm(Female type) Strainer Filtering and stacking particles inside circulating water Electronic heater Providing additional heating capacity to the water circuit Control box PCB and terminal blocks Plate heat exchanger Heat exchange between refrigerant and water Water pump...
  • Page 10 AHBW126A0/AHBW146A0/AHBW166A0 Description Name Remarks Entering water pipe PT 25.4mm(Female type) Leaving water pipe PT 25.4mm(Female type) Strainer Filtering and stacking particles inside circulating water Electronic heater Providing additional heating capacity to the water circuit Control box PCB and terminal blocks Plate heat exchanger Heat exchange between refrigerant and water Water pump...
  • Page 11 3. Nomenclature Model number nomenclature Serial number Chassis name / Function A : General heating heat pump H : Sanitary heating only T : High temperature heating heat pump Product electric power rating 6 : 220-240 V~ 50 Hz 8 :380-415 V3~ 50 Hz Heating capacity (kW) Ex) 16 : 16kW class Model Type...
  • Page 12 Category Function AHBW126A0/AHBW146A0/AHBW166A0 Drain pump E.S.P. control Installation Indoor Box High ceiling operation Hot start Self diagnosis Soft dry operation Defrost / Deicing sensor Reliability Phase protection Restart delay (3-minutes) Self diagnosis Soft start Test function Auto changeover Auto cleaning Auto operation(artificial intelligence) Auto restart operation Child lock...
  • Page 13 Part 2 Features & Controls 1. List of Function..............11 2. Features & Controls ............12 3. Test Run................34 - 13 -...
  • Page 14 1. List of Function AHBW056A0/AHBW076A0/AHBW096A0 Category Function Installation Drain pump E.S.P. control Indoor Box High ceiling operation Reliability Hot start Self diagnosis Soft dry operation Defrost / Deicing High pressure sensor Phase protection Restart delay (3-minutes) Self diagnosis Soft start Test function Convenience Auto changeover...
  • Page 15 Category Function AHBW126A0/AHBW146A0/AHBW166A0 Drain pump E.S.P. control Installation Indoor Box High ceiling operation Hot start Self diagnosis Soft dry operation Defrost / Deicing sensor Reliability Phase protection Restart delay (3-minutes) Self diagnosis Soft start Test function Auto changeover Auto cleaning Auto operation(artificial intelligence) Auto restart operation Child lock...
  • Page 16 2. Feature & Controls 1. Summarized Features 1.1 Emergency Control Easy checking of system failure - Slight / Heavy trouble Heavy Slight trouble trouble Emergency operating - Heavy trouble - Electric heater ON - Secure at least heating before A/S 1.2 Remote controller •...
  • Page 17 • Display Panel Cooling Electric Heater (2) Defrost Heating Water Tank Electric Heater Water-Pipe Anti Freezing Weather-dependent Heating Water Pump Water Tank Disinfection Space Temp. Solar Thermal circulation pump Outdoor Unit Water Inlet Temp. Water Tank Heating Enable / Disable Child Lock Water Outlet Temp.
  • Page 18 2. Special Function 2.1 Child Lock Function This function prevents children or others from tampering with the control buttons on the unit. • All the buttons on indoor display panel will blocked. The function is used to restrict children to not to use the AWHP carelessly.(CL is an abbreviated form of Child Lock.) Press Function Setting button to enter user setting mode.
  • Page 19 2.2 Sleep Timer Operation • When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the control panel while in appliance oper- ation, the operation of the appliance stops. • While the appliance is on pause, the sleep timer mode cannot be input. 2.3 Timer (On / Off) 2.3.1 On-Timer Operation •...
  • Page 20 3. System Set-up Heatpump is designed to satisfy various installation environment, it is important to set up sys- tem correctly. If not configured correctly, improper operation or degrade of performance can be expected. 3.1 DIP Switch Setting CAUTION Turn off electric power supply before setting DIP switch. •...
  • Page 21 DIP switch information • If you set Dip switch when power is on, the changed setting will not be applied immediately. The changed setting will be enabled only when Power is reset or by pressing Reset button. 8 7 6 5 4 3 2 1 Description Setting As Master...
  • Page 22 Target Target Target Dip Switch Leaving Water Room Air Sanitary Water (#4) Temperature Temperature Temperature High temperature cycle 50 °C 24 °C 70 °C Low temperature cycle 30 °C 19 °C 50 °C - 22 -...
  • Page 23 • Following features are permitted in emergency operation : Operation On/Off VIEW TEMP button(*) Temperature adjust button (*) Sanitary water heating Enable / Disable (*) : Temperature measured by failed sensor is displayed as ‘- -’. (*) : Adjusted temperature is only used to control electric heater on / off condition. The unit does not turn on / off according to the setting temperature at the remote controller.
  • Page 24 3.2 Control Panel Setting How to enter installer setting mode CAUTION Installer setting mode is to set the detail function of the remote controller. If the installer setting mode is not set correctly, it could cause problems to the unit, user injury or property dam- age.
  • Page 25 Summary Example of function code display Function Code Value #1 Value #2 Code Item Detail Remark Function Additional refrigerant charging Description Instant cooling operation for charging additional refrigerant Value #1 Note Default Range Value #2 Note Default Range Function Disable 3 minute delay Description Factory use only Value #1 Note...
  • Page 26 - 26 -...
  • Page 27 Code Item Detail Remark Value #2 Note Lower limit of setting range(FCU is not equipped) Default 16 °C Range 16 ~ 18 °C Function Setting air temperature in heating mode Description Adjusting range of 'Setting Air Temperature' in heating mode 'Setting air temperature' is Value #1 Note...
  • Page 28 e t I l i a i t c i t t c i r f f o t i w i t t Description Setting for using Step 1 capacity Setting for using Step 2 capacity of electric heater of electric heater Value #1 Note Outdoor air temperature where...
  • Page 29 Code Item Detail Remark Function Setting leaving water temperature range for weather-dependent operation Description Setting leaving water max / min temperature fo r weather-dependent operation Value #1 Note Upper limit of setting range Default 55 °C Range 35 ~ 57 °C Value #2 Note Lower limit of setting range Default...
  • Page 30 Code Item Detail Remark Function Miscellaneous setting Description Determine electric heater and water heater on and off Value #1 Note 00: Operate both electric heater and sanitary tank heater 01: Operate only sanitary tank heater Default Range 00 ~ 01 Value #2 Note Not used Default...
  • Page 31 Common setting • Function Code 01 : Additional refrigerant charging Function Code 01 should be performed when additional refrigerant charging is required. To charge the refrigerant, the unit must run in cooling mode. additional refrigerant charging instantly makes the unit working in cooling mode for 18 minutes.
  • Page 32 Temperature range setting • Function Code 11 : Setting air temperature in cooling mode Determine cooling setting temperature range when air temperature is selected as setting temperature. Only available when remote air temperature sensor is connected. • Accessory PQRSTA0 should be installed. •...
  • Page 33 Temperature control parameter setting and etc • Function Code 21 : Setting electric heater On / Off temperature Using Step 1 capacity of electric heater : when DIP switch No. 6 and 7 is set as ‘OFF-ON’ : - Value #1 : outdoor air temperature where Step 1 capacity of electric heater starts operation. - Value #2 : not used.
  • Page 34 • Function Code 23, 24, and 25 : Setting weather-dependent operation Weather-dependent operation is that the unit automatically adjusts target temperature (leaving water or room air) according to the outdoor air temperature. - Value #1 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.
  • Page 35 • Function Code 26 and 27 : Setting disinfection operation Disinfection operation is special sanitary tank operation mode to kill and to prevent growth of viruses inside the tank. - Value #1 of Function Code 26 : Selecting enable or disable of disinfection operation. ’00’ for disable, and ’01’ for enable.
  • Page 36 • Function Code 28 and 29 : Setting control parameter for sanity water heating operation Descriptions for each parameters are as following. - Value #1 of Function Code 28 : temperature gap from Value #2 of Function Code 28. - Value #2 of Function Code 28 : maximum temperature generated by AWHP compressor cycle. - Example : If Value #1 is set as ‘5’...
  • Page 37 • Function Code 2A : Miscellaneous setting - Value #1 of Function Code 2A : determine electric heater and sanitary tank heater on and off. - Value #2 of Function Code 2A : not used. - Example : If Value #1 is set as ‘0’, then electric heater and sanitary tank heater are on and off according to con- trol logic.
  • Page 38 3. Test Run 1. Check before Test Run Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly. Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground.
  • Page 39 2. Test Run Flow chart START Check whether the power cable and Operate the unit in heating mode. communication cable are completely connected Does Test operation start? Is cold water discharged for * Check the load (In/Out Temp.) more than 3 minutes ? * Check pipe length and amount of refrigerant Is there any temperature...
  • Page 40 Part 3 Basic Control 1. Normal operation............37 2. Compressor control ............37 3. EEV(Electronic Expansion Valve) control ....37 - 40 -...
  • Page 41 1. Normal operation Basic principle is to control the rpm of the motor by changing 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).
  • Page 42 Part 4 Replacement 1. Replacement Procedure for Compressor ....39 2. Replacement Procedure for INV PCB ......40 3. Caution for Assembling Outdoor Panels after Test Run ............41 - 42 -...
  • Page 43 1. Replacement Procedure for Compressor 1. Remove the sound proof covering the faulty com- pressor, and disconnect the power 2. Disconnect the brazing sections of suction pipe and discharge pipe by using brazing torch after the refrig- erant has been pumped out or collected completely. 3.
  • Page 44 2. Replacement Procedure for INV PCB 1. Disassemble panel assembly by unscrewing screws. (Figure 1.) 2. Replace PCB assembly. (Figure 2.) When assemble PCB assembly with control case, make sure that PCB case is inserted surely in the slit of control case. 3.
  • Page 45 3. Caution for Assembling Outdoor Panels after Test Run When assemble the unit 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.
  • Page 46 Part 5 Trouble Shooting - 46 -...
  • Page 47 Trouble Shooting 1. Checking Key Components of Unit..........44 1.1 Flow Switch ....................44 1.2 Water Pump ....................45 1.3 Electric Heater...................46 2. Self-Diagnosis Feature..............47 2.1 Concept of ‘Classified Trouble’ ...............47 2.2 Error Code List..................48 3. Trouble Shooting Guide t ................- 47 -...
  • Page 48 1. Checking Key Components of Unit 1.1 Flow Switch Start System stopped *Water pump Control Panel while operation running Shows ‘CH14’ Water is not enough The flow switch is Pressure gauge or there can be electrically closed. indicates 150~200 kPa water leakage inside water circuit.
  • Page 49 1.2 Water Pump Start Water pump always *Water pump runs Water pump always running while system and stops while stop while system compressor start-up operation operation Water pump does Heating (it is normal not working Operation condition) DIP Switch No.5 is set to OFF ? Water pump control by...
  • Page 50 1.3 Electric Heater *1 : When electric heater is working, ‘Electric Heater Operating Icon )’ is displayed at control panel Start *2 : For single-phase model : Measure electric voltage at port 3 (Live) and port 4 (Neutral) of Terminal Block 3 with voltage meter. The measured value should be 220-240 V~ AC.
  • Page 51 1.4 Remote Controller To solve various troubles while using control panel, please read following FAQ (Frequently Asked Questions). For your convenience, all questions are classified according to topics. Topic Question Answer Power button does System installation is fin- • There can be a problem in wiring between PCB not bright ished.
  • Page 52 1.5 Compressor Check and ensure in following order when error related with the compressor or error related with power occurs during operation: Checking Item Symptom Countermeasure Is how long power on during 1) Power on for 12 hours or more •...
  • Page 53 1.6 Fan Motor Checking Item Symptom Countermeasure (1) The fan motor does not 1) When power supply is • Modify connection status in front of or at the rear of operate. abnormal the breaker, or if the power terminal console is at Does failure appears frosting condition.
  • Page 54 2. Self-Diagnosis Feature 2. Self-Diagnosis Feature 2.1 Concept of ‘Classified Trouble’ • Definition of terms - Trouble : a problem which can stop system operation, and can be resumed temporarily under limited operation without certificated professional’s assist. - Error : a problem which can stop system operation, and can be resumed ONLY after certificated professional’s check.
  • Page 55 2.2 Error Code List Main PCB assembly(Heater) Error Description Main Reasons Code 01 * Problem in Remote Room Air sensor Remote room air sensor disconnection or short circuit 02 ** Problem in Refrigerant (Inlet side) sensor Refrigerant Inlet side sensor disconnection or short circuit 03 **** Bad communication between control panel and unit Connector connection error or connection wire break...
  • Page 56 Main PCB assembly(Inverter) - Red LED means error no. 10’s digit, and green LED means 1’s digit, and when red and green si- multaneously blink, it means 100’s unit. Ex) Inverter compressor IPM defect Error : error number 21 Error Code Description LED 1 (Red) LED 2 (Green)
  • Page 57 3. Trouble Shooting Guide Display Title Cause of error Check point & Normal condition code • Connector connection error Normal resistor : 10KΩ/ at 25˚C (Unplugged) Remote room • Faulty PCB(Heater) Normal voltage : 2.5Vdc / at 25˚C(Plugged) air sensor •...
  • Page 58 Display Title Cause of error Check point & Normal condition code •  Connector connection error • Connection of wire Communication Error • Faulty PCB(Heater) / • Main PCB(Heater) Volt. DC12V (Wired remote controller) Remote controller • Noise interference • Connection wire break Check Flow Chart Check the wire connection(Open /...
  • Page 59 Code Description Cause Normal Condition • The connector for transmission is dis- Bad communication connected between main PCB • The connecting wires are miscon- assembly(Inverter) • Wire connection between control panel nected and main PCB as- and main PCB 2 should be tight •...
  • Page 60 Display Title Cause of error Check point & Normal condition code Problem in • Connector connection error Normal resistor : 5KΩ/ at 25˚C(Unplugged) Water Tank • Faulty PCB(Heater) Normal voltage : 2.5Vdc / at 25˚C(Plugged) sensor • Faulty sensor (Open / Short) Refer to sensor resistance table.
  • Page 61 Code Description Cause Normal Condition 1. Check the poor soldering PCB(Heater) EEPROM • Check sum error 2. Check the insertion condition of the EEPROM Check Sum Error 3. Check the PCB Connection <EEPROM Direction Check Point> Check Point 1. Check the EEPROM Direction 2.
  • Page 62 Code Description Cause Normal Condition Problem in Flow Switch • Flow switch is open while in- • Flow switch should be closed while inter- ternal water pump is working nal water pump is working or DIP switch No. 5 of main PCB(Heater) is set as ON •...
  • Page 63 Code Description Cause Normal Condition • Possible maximum leaving water tem- Water pipe overheated • Abnormal operation of perature is 57 °C. electric heater • Leaving water temperature is above 57 °C Start Leaving water (it is normal temperature is higher condition) than target water temperature...
  • Page 64 Code Description Cause Normal Condition • It is occur when error • It is't occur when error 17,18,19 is Problem in Sensors 17,18,19 is happend at the happend at the same time. same time. n Error diagnosis and countermeasure flow chart - Refer to error code 17/18/19 Trouble shooting Guide.
  • Page 65 Display Title Cause of error Check point & Normal condition code • Connector connection error Normal resistor : 5KΩ/ at 25˚C (Unplugged) Problem in Water- • Faulty PCB(Heater) Normal voltage : 2.5Vdc / at 25˚C(Plugged) inlet sensor • Faulty sensor (Open / Short) Refer to sensor resistance table.
  • Page 66 Code Description Cause Normal Condition • If there is no problem in electric heater Electric Heater Overheated • Abnormal operation of control, possible maximum leaving electric heater water temperature is 80 °C. • Leaving water temperature is above 80 °C Start Leaving water (it is normal...
  • Page 67 Display Title Cause of error Check point & Normal condition code • An instant over current in the U,V,W phase - Comp lock • Instant over current - The abnormal connection of U,V,W DC PEAK • Over Rated current • Over load condition (IPM Fault) •...
  • Page 68 n AHBW056A0/AHBW076A0/AHBW096A0 1. Wait PCB(Inverter) DC voltage is discharged after main power off. 2. Pull out V, V, W COMP connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB(Inverter) needs to be replaced.(IPM damaged) 5.
  • Page 69 * AHBW126A0/AHBW146A0/AHBW166A0 AC(N)-BLUE AC(L)-BROWN U,V,W CONNECTOR 1. Wait PCB(Inverter) DC voltage is discharged after main power off. 2. Pull out AC(L), AC(N) connectors and U,V,W COMP Connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5.
  • Page 70 Display Title Cause of error Check point & Normal condition code 1. Malfunction of Compressor 2. Blocking of Pipe Max. C/T Input Over Current 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked... WARNING Before checking PCB(Inverter) or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
  • Page 71 Check Point 1. Check the power source.(230V ±15%) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (AHBW056A0/AHBW076A0/AHBW096A0 Check output the CT Sensor : DC 2.5±0.2V AHBW126A0/AHBW146A0/AHBW166A0 - Check output pin 2.3 of the CT Sensor : DC 2.5±0.2V) * AHBW056A0/AHBW076A0/AHBW096A0 IN/I...
  • Page 72 Display Title Cause of error Check point & Normal condition code • DC Link Voltage is • Check CN_(L), CN_(N) Connection above 420Vdc DC Link High / Low Volt • Check Input Voltage • DC Link Voltage is • Check PCB DC Link voltage sensor parts below 140Vdc WARNING Before checking PCB(Inverter) or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 73 Check Point 1. Check the WCN_P(L),P(N) Connection condition at the main PCB(Heater). (Refer to wiring diagram) 2. Check the DC Link voltage at not operating(280V↑) 3. Check the DC Link voltage at Comp operating(340V↑) 4. Check DC Link Sensing Signal :2.4~2.8V (Refer the Picture) * AHBW056A0/AHBW076A0/AHBW096A0 IN/I Black...
  • Page 74 AHBW126A0/AHBW146A0/AHBW166A0 - 74 -...
  • Page 75 Display Title Cause of error Check point & Normal condition code • Check the connection of comp wire “U,V,W” DC Compressor • Compressor • Malfunction of compressor Position Starting fail error • Check the component of “IPM”, detection parts. WARNING Before checking PCB(Inverter) or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 76 AHBW056A0/AHBW076A0/AHBW096A0 U, V, W <CT Sensing Check Point> <WVC connector check> AHBW126A0/AHBW146A0/AHBW166A0 - 76 -...
  • Page 77 Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation damage/Motor PCB(Inverter) input damage) AC Input Instant over current is over 3. Input voltage abnormal (L,N) Current Error 100A(peak) for 2us 4.
  • Page 78 * AHBW056A0/AHBW076A0/AHBW096A0 <Short Check Point> After turning off the main power R24N After turning off the between the ends of the resistance will between the ends o be measured 620~670Ω. be measured 620~6 * AHBW126A0/AHBW146A0/AHBW166A0 <Short Check Point> - 78 -...
  • Page 79 Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) Inverter compressor over Inverter compressor input 2. Compressor damage(Insulation damage/Motor current current is over 30A damage) 3. Input voltage low 4. ODU PCB assembly 1 damage WARNING Before checking PCB(Inverter) or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 80 Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint/ screened/ flow High temperature in • Refrigerant leakage structure Discharge pipe of the (insufficient) • Check refrigerant leakage inverter compressor •...
  • Page 81 Display Title Cause of error Check point & Normal condition code • Defective low pressure sensor • Defective unit fan • Refrigerant shortage/leakage • Deformation because of damage of refrigerant pipe • Defective unit EEV Excessive decrease of low Low Presser Error •...
  • Page 82 Display Title Cause of error Check point & Normal condition code • Open / Short 1. Bad connection of thermistor connector D-pipe sensor (Inverter) • Soldered poorly 2. Defect of thermistor connector (Open/Short) • Internal circuit error 3. Defect of outdoor PCB(Inverter) •...
  • Page 83 Display Title Cause of error Check point & Normal condition code • Bad connection of connector PCB(Inverter) • Bad connection high pressure connector Sensor error of high Abnormal value of sensor • Defect of high pressure connector (Open/Short) pressure (Open/Short) •...
  • Page 84 Display Title Cause of error Check point & Normal condition code • Power input AC 230V. • The connector for transmission is disconnected. Title • The connecting wires are misconnected. • Communication poorly Communication • The communication line is shorted at GND. (PCB(Heater) ’...
  • Page 85 Display Title Cause of error Check point & Normal condition code 1. EEPROM contact defect/wrong insertion PCB(Inverter) & Main EEPROM Access error 2. Different EEPROM Version EEPROM check sum error and Check SUM error 3. ODU Inverter & Main PCB assembly 1 damage WARNING Before checking PCB(Inverter) or each outdoor electric parts, wait for 3 minutes after the power is off.
  • Page 86 * AHBW126A0/AHBW146A0/AHBW166A0 EEPROM - 86 -...
  • Page 87 Display Title Cause of error Check point & Normal condition code • Overload operation (Outdoor fan constraint, screened, blocked) • Check outdoor fan constraint / screened / flow • Unit heat exchanger structure High temperature contaminated • Check if refrigerant overcharged in Cond.
  • Page 88 Display Title Cause of error Check point & Normal condition code 1. ODU fan locking 2. Heatsink assembly of PCB assembly 1 condition 220-240 V~ heatsink Heatsink High error abnormal temperature is over 85°C 3. Defect of temperature sensing circuit part defect of INV PCB(Inverter) n Error Diagnosis and Countermeasure Flow Chart 1.
  • Page 89 * AHBW056A0/AHBW076A0/AHBW096A0 PFCM: Measuring resistance between No.19,20 pin * AHBW126A0/AHBW146A0/AHBW166A0 Ω - 89 -...
  • Page 90 Display Title Cause of error Check point & Normal condition code 1. ODU fan locking Fan RPM is 10RPM or 2. Heatsink assembly of PCB assembly 1 condition less for 5 sec. when ODU abnormal Fan Lock Error fan starts or 40 RPM or 3.
  • Page 91 AHBW056A0/AHBW076A0/AHBW096A0 Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester <Main PCB> AHBW126A0/AHBW146A0/AHBW166A0 - 91 -...
  • Page 92 Display Title Cause of error Check point & Normal condition code 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage AC input instant over PCB(Inverter) input (Insulation damage/Motor damage) current error power current is over 3. Input voltage abnormal (L, N) (Matter of software) 48A(peak) for 2ms 4.
  • Page 93 * AHBW056A0/AHBW076A0/AHBW096A0 < Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 93 -...
  • Page 94 AHBW126A0/AHBW146A0/AHBW166A0 AHBW126A0/AHBW146A0/AHBW166A0 < Input Power Source Check Point > < Input Power Source Check Point > - 94 -...
  • Page 95 Sensor resistance table Pipe Temp Air Temp B Constant 3977 B Constant 3977 Std Temp Std Temp Resistance Resistance Temp Resistance Volt Temp Resistance Volt 102.17 4.714 204.35 4.72 73.49 4.611 146.97 4.62 53.55 4.481 107.09 4.492 39.5 4.322 4.336 29.48 4.131 58.95...
  • Page 96 Heatsink Temp D-Pipe Temp B Constant 3970 B Constant 3500 Std Temp Std Temp Resistance Resistance Temp Resistance Volt Temp Resistance Volt 102.17 4.71 2845.99 4.969 73.49 4.61 585.66 4.851 53.55 4.48 465.17 4.814 39.5 4.32 372.49 4.77 29.48 4.13 300.58 4.717 22.24...
  • Page 97 Check of compressor n Check resistance of the compressor n Check Insulation resistance of the compressor Comp Copper pipe Ω Comp Resistance (Ω) at 25 °C Resistance (Ω) at 25 ℃ Model Terminal All models AHBW126 1.183 1.174 1.181 U-GND More than 2MΩ...
  • Page 98 October, 2013 P/NO : MFL68026801...

This manual is also suitable for:

Therma v ahbw056a0Therma v ahbw076a0Therma v ahbw096a0Therma v ahbw126a0Therma v ahbw146a0Therma v ahbw166a0

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