http://biz.lgservice.com Room Air Conditioner SVC MANUAL(General) MODEL : General Wall Mounted-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in this SVC manual. Only for authorized service personnel.
Air Conditioner Service Manual CONTENTS Part 1 General Information 1. Safety Precautions........................................................................................................4 2. Nomenclature ...............................................................................................................7 Part 2 Functions & Controls 1. List of Functions & Controls........................................................................................9 2. Basic Mode Controls ................
Part 1 General Information 1. Safety Precautions ............................................................................................................4 2. Nomenclature......................................................................................................................
Part 1 General Information 1. Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. ■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to properties only. ■ Meanings of symbols used in this manual are as shown below.
Part 1 General Information Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock. Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc. Indoor/outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals.
Part 1 General Information 1.2 Inspections after Repair Check to see if the power cable plug is not dirty or loose. If the plug is dusty or loose it can cause an electrical shock or fire. Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances. otherwise, it can cause an electrical shock, excessive heat generation or fire. Do not insert hands or other objects through the air inlet or outlet while the product is operating.
Part 1 General Information 2. Nomenclature 2.
Part 2 Functions & Controls 1. List of Controls & Functions ..........................................................................................9 2. Basic Mode Controls......................................................................................................10 3. Special Mode Controls...................................................................................................12 4. Utility Functions ......................................................................................
Part 2 Functions & Controls 1. List of Functions & Controls Category Basic mode controls Special Mode controls Function Cooling Mode Heating Mode Healthy Dehumidification Automatic operation Auto Changeover Jet Cool Jet Heat Energy saving Forced operation Auto Clean Utility Functions Air volume control Natural Air control Chaos Swing Sleep mode Auto control Auto Restart Function Protection Controls & Functions Five Second Delay (Fan) Two Minutes Stand-by (Comp.
Part 2 Functions & Controls 2. Basic Mode Controls 2.1 Cooling Mode Thermo ON +0.5°C(1°F) Setting Temp. -0.5°C(-1°F) Thermo OFF INV. Comp. Frequency Low High Comp. OFF High Low • Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions. • If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 seconds.
Part 2 Functions & Controls 2.3 Healthy Dehumidification operation • When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the setting temp. is automatically set according to the intake air temperature. Intake air Temp. Setting Temp. 26°C(78.8°F) ≤ intake air temp. 25°C(77°F) 24°C(75.2°F) ≤ intake air temp.< 26°C(78.8°F) intake air temp. -1°C(-2°F) 22°C(71.6°F) ≤ intake air temp. < 24°C(75.2°F) intake air temp. -0.5°C(-1°F) 18°C(64.
Part 2 Functions & Controls 3. Special Mode Controls 3.1 Jet Cool operation • In the heating mode or Fuzzy operation, the Jet cool function does not work. When it is input while in other mode of operation (cooling, dehumidification, ventilation), the Jet cool operation takes place. • In the Jet cool mode, the indoor fan is operated at super-high speed for 30 min. at cooling mode operation. • In the Jet cool mode, the room temperature is maintained at a setting temperature of 18°C(64.4°F).
Part 2 Functions & Controls 4. Utility Functions 4.1 Forced operation • To operate the appliance manually in case when the remote control is lost, the forced operation selection switch is on the main unit of the appliance, and operate the appliance in the standard conditions. • The operating condition is set according to the outdoor temp. and intake air temperature as follows. Indoor temp. Operating Mode Setting temp. over 24°C(75.2°F) Cooling 22°C(71.6°F) 21~24°C(69.8~75.
Part 2 Functions & Controls 4.3 Air volume control • Indoor fan motor control have 6 steps. Step Description • Air volume is controlled "SH", "H", "Med", "Low" by the remote controller. LL L M H SH Auto Very low, In heating mode Low Med High Super high Natural wind • "LL" step is selected automatically in Hot start operation. 4.4 Natural Air Control(Auto Wind) • When the Auto Step is selected and then operated, the high, medium, or low speed of the airflow mode is operated for 2~15 sec.
Part 2 Functions & Controls 4.6 Sleep mode Auto control • When the set sleep time is reached set time of [1,2,3,4,5,6,7hour] input by the remote control during the operation, the operation of the appliance stops. • When the appliance is on pause, the sleep timer mode cannot be input. 4.6.1 Sleep timer operation for cooling cycle • While in cooling mode , 30 min. after the start of the sleep timer, the setting temperature increases by 1 C(2 After another 30minutes lapse, it increases again by 1°C(2 . .
Part 2 Functions & Controls 5. Protection Functions & Controls 5.1 Five Seconds Stand-by (fan) • The indoor unit fan rotates after 5 seconds when unit is turned on. 5.2 Two Minutes Stand-by (comp.) • Compressor starts two minutes later, after it is turned off 5.3 Hot start • When unit starts in the heating mode to prevent cold wind blowing, the indoor fan does not rotate until the temp. of heat exchanger reaches 30°C(86°F)(model by model) 5.
Part 2 Functions & Controls 5.5 Automatic defrost 5.5.1 9,12kBtu/h Model • While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing, reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit. • Defrosting control is available 40 minutes later since heating cycle started and the difference of the pipe temperature of outdoor unit reaches above option 1.
Part 2 Functions & Controls 5.5.2 18,24,30kBtu/h Model • Starting to the defrosting operation 1) Defrost operation will be start when the conditions below are matched a) Accumulation time of operation and the period after completion of defrost = 35 min. b) After 10 minutes from re-starting the compressor .In case of being over 35 minutes of accumulated operating time, defrosting operation starts after 10 minutes.
Part 2 Functions & Controls • Defrosting Control Algorithm 1) Lowering the compressor frequency when starts the defrosting operation. Constant speed compressor is ON after 10 seconds from the arrival time of 30 Hz (Option) frequency and is speed up its revolution till 100 Hz (Option) 2) Every EEV have 350 pulse (Option) of opening when starts defrosting operation. 3) Reversing valve is OFF after 5 seconds from arriving the compressor operating frequency of 30 Hz and then fans of indoor units turn OFF.
Part 2 Functions & Controls 5.6 Power Relay Control • Power relay turns on 1 second later after the power is supplied to the outdoor unit. • Control sequence : power on → PTC operating → power relay on 5.7 Inverter U V W + U V W 3Ø Comp. Motor 1. The single phase power AC is converted into DC. 2. The single phase power DC is converted into a three phase chopped DC voltage with a variable frequency. 3.
Part 2 Functions & Controls 5.8 Overheating Protection (Power Module) 5.8.1 9,12kBtu/h Model • If the temperature of the heat sink thermistor. reaches over Toff, the Compressor stop instantly. • The compressor operating frequency is limited according to the heat sink thermistor. (refer to below FIG.) • It will blink 4 times, when the thermistor is open or short, also when the temperature is over T off. T off °C ∆T = (T off - T on)/3 T1 = T on + ∆T T2 = T on + 2 * ∆T Heat Sink Temp.
Part 2 Functions & Controls 5.8.2 18,24,30kBtu/h Model • Function : Power module failure protection by checking the temperature of heat sink. There is a temperature sensor for checking the heat sink temperature. • Heat sink sensor failure error Short Check : if temperature ≥130°C(266°F) Open Check : if temperature < - 30°C(-22°F) System will go in self diagnosis (Error code 65) is displayed and product stops.
Part 2 Functions & Controls 5.9 Total Current Control (Over Current Protection) 5.9.1 9,12kBtu/h Model 1) CT1 control • If the operating current reaches I1, the operating frequency of the compressor decreases. • After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuously, the operating frequency of compressor increases by 1step.
Part 2 Functions & Controls 5.9.2 18,24,30kBtu/h Model 1) Detection : check the output DC voltage of Current Transformer(CT). 2) Current Transformer Sensing Error a) In initial power input, if the CT output is over 4.0V (25A) it shows. Error Code 40 (defect in CT sensing) 3) CT 1 detection : a) If total current exceeds CT1 value.reduce 1 step of operating Hz. - Step down 10Hz from current step. - If new Hz is below (cooling : Fc min,, heating :Fh min), then turn off the compressor.
Part 2 Functions & Controls 5.10 DC Peak control 5.10.1 DC Peak Current Error by a fault signal of IPM • If the operating current of IPM reaches 35A 3A, the compressor stops instantly. • If DC PEAK occurs 5 times within 1 hour, the appliance turns off and displays Error Code 6(9,12kBtu/h Model) / Error Code 21(18,24,30kBtu/h Model). 5.10.
Part 2 Functions & Controls 5.11.2 Inverter Compressor (18,24,30kBtu/h Model) 1) There can be two situations (a) Sensor is failed (Error Code 41) (b) Abnormal high temperature discharge temperature (error code for high discharge will be generated) Both cases unit will stop.
Part 2 Functions & Controls 5.11.3 Constant Compressor (only 30kBtu/h Model) 1) There can be two situations (a) Sensor is failed (Error Code 41) (b) Abnormal high temperature discharge temperature (error code for high discharge will be generated) Both cases unit will stop. 2) Compressor working (a) If discharge pipe temperature < T1 Compressor ON, EEV on-time control (b) T2 ≤ discharge pipe temperature < Toff (Hysteresis control) Expansion valve up by ßpulse every 1 min.
Part 2 Functions & Controls 5.12 Low Ambient control 5.12.1 9,12kBtu/h Model • If outdoor temperature drops below certain temperature, liquid back is prevented by reducing fan speed. • It can prevent frosting of evaporator and keep cooling operation • No matter even if the outdoor temperature reaches -10°C(14°F). • You can Cool your room at your desired temperature all year around. Outdoor temp.:-10°C(14°F) 25(77°F) Comp Freq. Cond . temp. 20(68°F) Freq. On On Off Off Outdoor pipe temp.
Part 2 Functions & Controls 5.13 Oil return control(30kBtu/h Model) 5.13.1 Operating Contion 1) When the continuous running time is over 3hr.(option), oil returning operation is made for 3min. In case of the initial operation, oil returning operation is made, after completing initial operation. 2) After defrost and oil returning operation, the continuous running time is resetted. 5.13.2 Operation Process 1) EEV-Full open, Hot gas bypass valve-On 2) Compressor Step-70Hz + Constant Comp.
Part 3 Test Run 1. Check before Test Run...................................................................................................31 2. Test Run Flow chart .......................................................................................................32 3. Test Run Detail................................................................................................................
Part 3 Test Run 1. Check before Test Run 1 Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly. Check whether the liquid pipe and gas pipe valves are fully opened. 2 NOTE: Be sure to tighten caps. Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground. Do not operate in the case of 2.0 MΩ or less. 3 NOTE: Never carry out mega ohm check over terminal control board.
Part 3 Test Run 2. Test Run Flow chart START Test operation for indoor unit Operate the unit in cooling mode. Does Test operation start? No Refer to part4, 7 Electric part Yes Is cold air discharged for more than 3 minutes ? No Yes Is there any temperature difference between intake and discharged air? Refer to part4, 5 Cycle part No Yes Is the operating current normal ? No Yes Operation mode change to Heating mode Is hot air discharged ? After Hot Start No * Check the load (In/Out Temp.
Part 3 Test Run 3. Test Run Detail 1. Check that all tubing and wiring have been properly connected. 2. Check that the gas and liquid side service valves are fully open. Settlement of outdoor unit • Anchor the outdoor unit with a bolt and nut(ø10mm) tightly and horizontally on a concrete or rigid mount. • When installing on the wall, roof or rooftop, anchor the mounting base securely with a nail or wire assuming the influence of wind and earthquake.
Part 4 Trouble Shooting 1. 2-Way, 3-Way Valve ........................................................................................................35 2. Pumping Down ..............................................................................................................36 3. Evacuation (All amount of refrigerant leaked) ............................................................37 4. Gas Charging (After Evacuation) .................................................................................
Part 4 Trouble Shooting 1. 2-Way, 3-Way Valve 2-way Valve (Liquid Side) Hexagonal wrench (4mm) Flare nut 3-way Valve (Gas Side) Valve cap Open position Flare nut Closed position Open position Closed position To piping connection To piping connection To outdoor unit Works Shipping 1.
Part 4 Trouble Shooting 2. Pumping Down Liquid side Indoor unit 2-Way valve Open Outdoor unit Gas side Closed 3-Way valve Lo CLOSE CLOSE Purge the air • Procedure (1) Confirm that both the 2-way and 3-way valves are set to the open position. – Remove the valve stem caps and confirm that the valve stems are in the raised position. – Be sure to use a hexagonal wrench to operate the valve stems. (6) Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg/cm2 .g.
Part 4 Trouble Shooting 3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump Vacuum Gage Lo OPEN OPEN • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward 0.8 Torr.
Part 4 Trouble Shooting 4. Gas Charging (After Evacuation) Liquid side Indoor unit 3-Way valve Open Outdoor unit Gas side Open 3-Way valve Check valve Charging cylinder Vacuum Gage Lo (1) OPEN CLOSE • Procedure (1) Connect the charge hose to the charging cylinder. – Connect the charge hose which you dis-connected from the vacuum pump to the valve at the bottom of the cylinder.
Part 4 Trouble Shooting 5. Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air, and operating current. Temp. difference Current : approx. 0°C(1°F) : less than 80% of rated current All amount of refrigerant leaked out. Check refrigeration cycle. Temp. difference Current : approx. 8°C(16°F) : less than 80% of rated current Refrigerant leakage Clog of refrigeration cycle Defective compressor Temp.
Part 4 Trouble Shooting 2. Check temperature and pressure of refrigeration cycle. Suction pressure (Compared with the normal value) Temperature (Compared with the normal value) Cause of Trouble Description High Defective compressor Current is low. Normal Excessive amount of refrigerant High pressure does not quickly rise at the beginning of operation. Insufficient amount of refrigerant(Leakage) Clogging Current is low. Higher Lower Higher NOTICE 1. The suction pressure is usually 8.5~9.
Part 4 Trouble Shooting 6. Electronic Parts Troubleshooting Guide Trouble 1 The Product doesn’t operate at all. (9~30kBtu/h Model) Turn off the main power and wait until LED on outdoor PCB is off. Turn on the main power again. Does "Beeping" sound is made from the indoor unit? Does "Lighting" LED is mounted on the outdoor PCB? NO YES Check the voltage of power(AC 208~230V, 60Hz). • The voltage of main power. • The voltage applied to the unit.
Part 4 Trouble Shooting Trouble 2 Product doesn't operate with the remote controller. (9~30kBtu/h Model) Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 2 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controlled by the remote controller. (When operated in the Sleeping Mode, the wind speed is set to the low speed as force).
Part 4 Trouble Shooting Trouble 3 The Compressor/Outdoor Fan don't operate (9~30kBtu/h Model) Turn on the main power. Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least. When in air circulation mode, compressor/outdoor fan is stopped. Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.
Part 4 Trouble Shooting Trouble 4 The Compressor/Outdoor Fan don't operate (18, 24, 30kBtu/h Model) Turn on the main power. Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least. When in air circulation mode, compressor/outdoor fan is stopped. Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.
Part 4 Trouble Shooting Trouble 5 When indoor Fan does not operate.(9~30kBtu/h Model) Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. Check the Fuse(AC250V, T2A). Check the related circuit of indoor Fan Motor. • The pin No. 38 of micom and the part for driving SSR.(Q01M) • Check the related pattern. • Check the SSR. - SSR Open: Indoor Fan Motor never operate. - SSR short: Indoor Fan Motor always operates in case of ON or OFF.
Part 4 Trouble Shooting 7. Self-diagnosis Function ■ Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table. • If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed. • After error occurrence, if error is released, error LED is also released simultaneously.
Part 4 Trouble Shooting ■ 18,24,30kBtu/h Model Indoor Error Error code Descrition INV TPS LED1 (Red) LED2 (Green) Indoor Status ON 00 No Error 01 Indoor Room themistor error 1time OFF 02 Indoor in-piping sensor error 2times OFF 03 Remote controler error 3times OFF 04 Drain Pump error 4times OFF 05 Communcation error between in and out 5times OFF 06 Indoor Out-Piping sensor error 6times OFF 07 Diffrent mode operation times OFF Outdoor Error Ex) Error Code 21 (IPM Fault) 2
Part 4 Trouble Shooting Error code LED01G LED02G (Green) (Red) Contents Case of error Outdoor Status CT Circuit malfunction Off 1 time Open / Short Off 4 times 4 times Open / Short Off Cond. Pipe sensor (open/ short) 4 times 5 times Open / Short Off 46 Suction pipe sensor (open/ short) 4 times 6 times Open / Short Off 47 D-pipe sensor Cons.
Part 4 Trouble Shooting ■ Troubleshooting Guide(9,12kBtu/h Model) Error code Description Cause of error 1 Indoor TH. is short or open • Indoor TH. (sensor) is short or open • Indoor TH. (sensor) is not connected to the indoor pcb assembly • Damage or defect on the sensing circuit of indoor pcb assembly. (R01H, R02H, R03H, R04H, C01H, C02H) Check flow YES Indoor TH. is connected to Indoor pcb assembly ? YES Sensing circuit of indoor pcb is right ? Indoor TH. is right ? No No No Check Indoor TH.
Part 4 Trouble Shooting Error code 4 Description Cause of error Heat-sink Temp. is over 95°C(203°F) Heat-sink TH. is open or short • Heat-sink TH. is damaged(short or open). • Heat-sink Temp. is over 95°C(203°F) • Damage or defect on the sensing circuit of outdoor pcb assembly. (R01H, R02H, C01H) Check flow YES YES Heat-sink TH is connected to outdoor PCB assembly? No - Connect to CN-TH2 in outdoor PCB assembly 50 Room Air Conditioner Heat-sink TH. in INV-IC is Right ? No Check heat-sink TH.
Part 4 Trouble Shooting Error code Description 5 Cause of error • Wrong or missing wiring between indoor and outdoor unit cable • Defect of communication components in indoor pcb assembly • Defect of communication components in outdoor pcb assembly • Defect of power supply components in outdoor pcb assembly • No ground connection in air conditioner unit (affected by noise in power source) Communication Error Check flow YES YES Is the voltage of T/Block , in outdoor about AC 208~230V ? Wiring connecti
Part 4 Trouble Shooting Error code Cause of error Description 6 DC Peak Error • Supplied power is not normal • Comp Connector (CN-U,V,W) is disconnected or inserted to wrong position • Compressor is damaged (coil short) ➔ replace compressor • Too much Refrigerant • Defect in outdoor pcb assembly ➔ replace pcb assembly Check flow YES YES Supplied voltage to Outdoor pcb is about AC 208~230V ? Is connector (CN-U,V,W) connected to compressor and inserted to pcb in right position ? No Refrigerant press
Part 4 Trouble Shooting Error code Description Cause of error 7 Over current Error (CT2) • Supplied power is not normal • Indoor/outdoor fan is locked • Too much refrigerant • Defect in current sensing circuit in outdoor pcb assembly Check flow YES Supplied voltage to Outdoor pcb is about AC 208~230V ? YES Does indoor / outdoor fan work normally ? No No Check indoor / outdoor fan and adjust. Check power source Refrigerant pressure is right ? No Check refrigerant pressure and adjust.
Part 4 Trouble Shooting Error code Description Cause of error 8 Indoor fan is locked (BLDC fan model only) • Indoor fan is locked or separated • Fan connector is not connected to indoor pcb assembly • Defective in DC-fan driving circuit Check flow YES Indoor fan is rotating ? (1) YES Indoor fan is rotating ? (2) No DC–fan driving circuit is right ? No Check indoor unit - remove obstacles in indoor unit - fan assembled correctly.
Part 4 Trouble Shooting Description Error code 10 Cause of error D-Pipe TH. is short or open • D_pipe TH. is short or open • D_pipe TH. is not connected to the outdoor pcb assembly • Damage or defect on the sensing circuit of outdoor pcb assembly Check flow YES D_PIPE TH. is connected to Outdoor pcb assembly ? No Connect to CN-D_PIPE in outdoor pcb assembly YES D_PIPE TH. is right ? No Check D_PIPE TH. - Measure resistance of TH. (about 200kΩ at 25°C(77°F)).
Part 4 Trouble Shooting ■ Troubleshooting Guide(18,24,30kBtu/h Model) 1) Troubleshooting CH01, CH02, CH06 Error code Title 01 Indoor air sensor • Open / Short • Soldered poorly • Internal circuit error Normal resistor : 10kΩ/ at 25°C(77°F) (Unplugged) Normal voltage : 2.5VDC / at 25°C(77°F) (plugged) 02 Indoor inlet pipe sensor • Open / Short • Soldered poorly • Internal circuit error Normal resistor : 5kΩ/ at 25°C(77°F) (Unplugged) Normal voltage : 2.
Part 4 Trouble Shooting 2) Troubleshooting CH05, CH53 Error code 05 / 53 Title Communication (Indoor → Outdoor) Cause of error • Communication poorly Check point & Normal condition • Power input AC 208~230V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The GND1,2 is not connected at main GND. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal.
Part 4 Trouble Shooting 3) Troubleshooting CH21 Error code Title 21 Cause of error • Instant over current • Over Rated current • Poor insulation of IPM DC Peak Comp U Terminal U-V V-W W-U W Comp • An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant - Pipe length. • Poor insulation of compressor Resistance(Ω) at 20°C(68°F) Ω V Check point & Normal condition Copper pipe Inverter Constant comp. comp. 0.
Part 4 Trouble Shooting 4) Troubleshooting CH21, CH22 Error code Title Cause of error 21 Max. C/T 22 C/T Internal circuit Check point & Normal condition Over current (14A ) Malfunction of compressor Blocking of pipe Low voltage input Refrigerant, pipe length, blocked, … Initial current error Malfunction of current detection circuit. (Open / Short) The voltage of “C01N” is 4.0VDC(25A) . V - Check Point 1. Check the power source. 2. Check the fan operation is right. 3. Check the current.
Part 4 Trouble Shooting 5) Troubleshooting CH23, CH28 Error code Title 23 DC Link Low voltage. • DC link volt. is 140VDC . • Check the power source. • Check the components. 28 DC Link High voltage • DC link volt. is 420VDC . • Check the power source. • Check the components. Cause of error Check point & Normal condition Check Point 1. Check the power source. 2.
Part 4 Trouble Shooting 6) Troubleshooting CH24, CH25 Error code Title 24 Press S/W Open 25 Input voltage Cause of error Check point & Normal condition • Low / High press S/W open. • Check the connection of “CN_Press”. • Check the components. • Abnormal Input voltage (140VAC , 300VAC ). • Check the power source. • Check the components. TRANS1 50Hz, DC12V CN PRESS CN TRNAS1 Check Point • CH 24 • CH 25 1. Check the connection of “CN_PRESS” 1. Check the power source. 2.
Part 4 Trouble Shooting 7) Troubleshooting CH26, CH27 Error code Title 26 DC Compressor Position 27 PSC Fault Cause of error Check point & Normal condition • Compressor position detect error • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts. • Over current at “IGBT” • Check the component of “IGBT” . • Check the components. E C B C B E Check Point • CH 26 • CH 27 1. Check the connection of “U,V,W” 1.
Part 4 Trouble Shooting 8) Troubleshooting CH32, CH33, CH40 Error code Title 32 D-pipe (Inverter) temp. high (105°C(221°F) ) • Discharge sensor (Inverter) temp. high • Check the discharge pipe sensor for INV. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. 33 D-pipe (Constant) temp. high (105°C(221°F) ) • Discharge sensor (Cons.) temp. high • Check the discharge pipe sensor for Cons. • Check the install condition for over load.
Part 4 Trouble Shooting 9) Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Display code Title 41 D-pipe sensor (Inverter) • Open / Short • Soldered poorly • Internal circuit error • Normal resistor : 200kΩ / at 25°C(77°F) (Unplugged) • Normal voltage : 4.5VDC / at 25°C(77°F) (plugged) 44 Air sensor • Open / Short • Soldered poorly • Internal circuit error • Normal resistor : 10kΩ / at 25°C(77°F) (Unplugged) • Normal voltage : 2.
Part 4 Trouble Shooting 10) Troubleshooting CH51, CH60 Display code Title 51 Over capacity 60 EEPROM Check sum Cause of error Check point & Normal condition • Over capacity Combination • Check the indoor unit capacity. • Check the combination table. • Check sum error • Check the PCB ASM P/No. • Check the poor soldering. Check Point • CH 51 • CH 60 1. Check the indoor unit capacity. 1. Check the insertion condition of EEPROM. 2.
Part 4 Trouble Shooting 11) Troubleshooting CH61, CH62 Display code Title Cause of error 61 Condenser pipe sensor temp. high • Condenser pipe sensor detected high temp.(65°C(149°F)) • Check the load condition. • Check the sensor of Condenser pipe sensor. 62 Heat sink sensor temp. high • Heat sink sensor detected high temp.(85°C(185°F)) • Check the fan is locked. • Check the sensor of heat sink. Check point & Normal condition Heat Sink temp.
P/NO : MFL41161601 AUGUST, 2007