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Troubleshooting Guide * Measuring resistance between each terminal of compressor * Compressor wire connection Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 100 - LGE Internal Use Only
Error No. 28* Master 281 Slave1 282 Slave2 283 Error Type Error Point Main Reasons Inverter DC link high voltage error Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes Inv PCB DC link voltage supplied over 780V ■ Error Diagnosis and Countermeasure Flow Chart Is input voltage normal? Yes Is inverter PCB assembly normal? Yes Recheck power and installation condition * Measuring input voltage * Noise filter wiring No No T S R - 101 - Troubleshooting Guide 1. Input voltage abnormal (R,S,T,N) 2. ODU inverter PCB damage (DC Link voltage sensing part) Check R~S/S~T/T~R phase voltage is 380V ±10% R~N/S~N/T~N phase voltage is 220V ±10% → Check connection condition and wiring if power is abnormal Replace inverter PCB assembly N T S R Noise filter output(lower part) Noise filter input (upper part) LGE Internal Use Only
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System Outdoor Unit R410A SERVICE M
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Safety Precautions Copyright ©2007
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Ventilate before operating air cond
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Use power cables of sufficient curr
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Safely dispose of the packing mater
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1. Model Names 1.1 Indoor Unit * AR
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2.2 Outdoor Units 2.2.1 Cooling Onl
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3. Combination of Outdoor Units 3.1
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4. Nomenclature 4.1 Indoor Unit ARN
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Part 2 Outdoor Units Copyright ©20
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Function Copyright ©2007 LG Electr
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1.3 Master and slave Unit's EEV con
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2.1.2 Oil return control on heating
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2.3 Stopping operation 2.3.1 Stoppi
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3.2 Discharge temperature control
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4. Other control 4.1 Initial setup
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4.2 Emergency operation - If a comp
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■ Sensor Check Error Code Display
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Liquid Pipe Gas Pipe Procedure 1. A
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CAUTION 1. Guaranteed Temperature r
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4.7 Pump Out This function gathers
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4.8 Auto Back Up Function_Inverter
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4.10 Night Low Noise Function In co
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4.11 Vacuum Mode This function is u
Page 49 and 50: Part 3 PCB Setting and Test Run Cop
Page 51 and 52: 2. How to cope with Test Run abnorm
Page 53 and 54: ■ Checking according to dip switc
Page 55 and 56: Function Dry Contact Snow Forced De
Page 57 and 58: Replacement procedure for Compresso
Page 59 and 60: Part 4 Trouble shooting guide Copyr
Page 61 and 62: Copyright ©2007 LG Electronics. In
Page 63 and 64: 2.2 Fan Motor Checking Item Symptom
Page 65 and 66: • EEV Coil and body(Outdoor unit)
Page 67 and 68: 2.4 Phase Bridge Diode Checking Met
Page 69 and 70: 2.6 Fan IPM Checking Method 2.7 UW1
Page 71 and 72: 2.10 Other Copyright ©2007 LG Elec
Page 73 and 74: Outdoor unit related error Display
Page 77 and 78: Outdoor unit related error Copyrigh
Page 79 and 80: Outdoor unit related error Copyrigh
Page 83 and 84: Error No. 01 Indoor unit air sensor
Page 86 and 87: Troubleshooting Guide float A:Point
Page 88 and 89: Troubleshooting Guide Error No. 06
Page 92 and 93: Troubleshooting Guide Error No. 21*
Page 108 and 109: Troubleshooting Guide Error No. Err
Page 110: Troubleshooting Guide Error No. Err
Page 113 and 114: Error No. 52* Master 521 Slave1 522
Page 115 and 116: Error No. Error Type Error Point Ma
Page 117 and 118: Error No. 60* Master 601 Slave1 602
Page 119: Error No. 70* Master 701 Slave1 702
Page 122 and 123: Troubleshooting Guide Measuring inp
Page 140: P/NO : 3828A24006W OCT, 2007
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