Midea MSMBB-12CRDN1-MP0W Service Manual Download Page 28 | Manualshive

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26

9. Troubleshooting

Safety

Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity

power in capacitor.

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

For other models, please connect discharge resistance (approx.100

Ω

40W) or soldering iron (plug) b, -

terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.

Note: The picture above is only for reference. The plug of your side may be different.

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Summary of Contents for MSMBB-12CRDN1-MP0W

Page 1: ... all instructions in this manual can result in equipment SERVICE MANUAl DC Inverter Air Conditioner Table of Contents 1 Precaution 2 Part Names 3 Dimension 4 Refrigerant Cycle Diagram 5 Printed Circuit Board Connector Wiring Diagram of Outdoor Unit 6 Installation Details 7 Operation Characteristics 8 Electronic Function 9 Troubleshooting 10 Disassembly Instructions Mini Split 3D MSMBB 12CRDN1 MP0W...

Page 2: ...ation 12 6 4 Installation for the first time 13 6 5 Adding the refrigerant after running the system for many years 14 6 6 Procedure when servicing the indoor unit refrigeration circuit 14 6 7 Evacuation after servicing the outdoor unit refrigeration circuit 16 7 Operation Characteristics 18 8 Electronic function 19 8 1 Abbreviation 19 8 2 Display function 19 8 3 Main Protection 20 8 4 Operation Mo...

Page 3: ...ul of the case edges and the fins on the condenser and evaporator n For installation always contact the dealer or an authorized service center n Do not install the product on a defective installation stand n Be sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal injury n Do not le...

Page 4: ...ay properly A bad connection may cause water leakage n Keep level even when installing the product It can avoid vibration of water leakage n Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods It may cause a problem for your neighbors n Use two or more people to lift and transport the product n Do not install the product where it will be expos...

Page 5: ... of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion n Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may burn of explode n If the liquid from the batteries gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked ...

Page 6: ...es 2 1 Model Names of Indoor Outdoor units Series Capacity Indoor units Outdoor units Inverter 12k MSMBB 12CRDN1 MP0W MOB1 12CDN1 MP0W 18k MSMBC 18CRDN1 MP0W MOC 18CDN1 MP0W 22k MSMBD 22CRDN1 MP5W MOF1 22CDN1 MP5W ...

Page 7: ...5 2 2 Part names of Indoor Outdoor units ...

Page 8: ... 1 Indoor Unit Model W D H MSMBB 12CRDN1 MP0W 810 mm 31 89in 200 mm 7 87in 300 mm 11 81in MSMBC 18CRDN1 MP0W 980 mm 38 58in 225 mm 8 86in 325 mm 12 80in MSMBD 22CRDN1 MP5W 1090 mm 42 91in 235 mm 9 25in 338 mm 13 31in ...

Page 9: ...7 For MSMBB 12CRDN1 MP0W For MSMBC 18CRDN1 MP0W For MSMBD 22CRDN1 MP5W ...

Page 10: ...ng is only for reference The appearance of your units may be different Model W D H W1 A B MOB1 12CDN1 MP0W 780mm 30 7in 250mm 9 8in 540mm 21 3in 843mm 33 2in 549mm 21 6in 276mm 10 9in MOC 18CDN1 MP0W 760 mm 29 92in 285 mm 11 22in 590 mm 23 23in 823 mm 32 4in 530 mm 50 87in 290 mm 11 42in MOF1 22CDN1 MP5W 845mm 33 3in 320mm 12 6in 700mm 27 6in 908mm 35 7in 560mm 22 0in 335mm 13 2in ...

Page 11: ...9 4 Refrigerant Cycle Diagram For cooling only models INDOOR OUTDOOR LIQUID SIDE GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR CAPILIARY TUBE ...

Page 12: ...2 Burning CN29 Simulation D13 D14 E11 E13 E10 IC4 1 L3 R24 R25 R26 R27 R28 R60 R6 3 R82 R83 R84 R85 R86 R87 R88 R89 R90 R92 R94 R9 6 R97 R99 R101 R103 R105 R111 R11 8 R1 22 R129 R20 R48 R51 R49 R50 R145 R146 C37 C70 C80 R1 3 E16 R3 R37 R38 R79 R91 C8 C17 R 40 R41 R1 C82 C83 IC9 IC4 D9 R54 CN9 Earth LED2 RED R23 CN42 CompTop C21 C19 R34 C5 C45 C46 CN60 CN11 4 WAY L CN12 4 WAY N CN23 N IN CN24 L IN ...

Page 13: ...11 MOF1 22CDN1 MP5W ...

Page 14: ...use or switch are determined by the maximum current indicated on the nameplate which located on the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 6 3 Pipe length and the elevation Models Pipe size Gas Liquid MSMBB 12CRDN1 MP0W MOB1 12CDN1 M P0W 3 8in Ф9 52mm 1 4in Ф6 35mm MSMBC 18CRDN1 MP0W MOC 18CDN1 M P0W 1 2in Ф12 7mm 1 4in Ф6 35mm MSMBD 22CRDN1...

Page 15: ...the gauge manifold usually yellow to the vacuum pump 4 Fully open the handle for the low pressure gauge 5 Start the vacuum pump and operate according to manufacture spec s 6 Perform an evacuation for a minimum of 30 minutes and check that the low pressure compound gauge indicates a vacuum of 29 9 in hg 500 microns A vacuum gauge should be used if available If the proper vacuum cannot be achieved t...

Page 16: ...refrigerant Note that the 2 way and 3 way valves must be in the open position 3rd step the air in the gauge hoses needs to be purged out use the pressure from the system to purge the low side line loosen the connection on the manifold for a second next open the to valve on the refrigerant container to pressurize the line now loosen that hose at the manifold for a second and purge that line 3 Next ...

Page 17: ...ored in this case Stop compressor when the amperage approaches the name plate FLA rating indicates 0 1Mpa 14 5Psi 6 Now close the 3 way valve right away the pressure will rise during this time this is normal There will be some pressure left in the system this is normal The indoor unit is now ready to be serviced Disconnect the charge set and tighten the 2 way and 3 way valve s stem nuts Use a torq...

Page 18: ...as leakage 6 7 Evacuation after servicing the outdoor unit refrigeration circuit 1 Evacuation of the complete refrigeration circuit Indoor and outdoor unit Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 14 5Psi 500...

Page 19: ...lectronic scale displays the proper weight disconnect the charge hose from the 3 way valve s service port immediately If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose 6 Mounted the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to...

Page 20: ...N 1 If the air conditioner is used beyond the above conditions certain safety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to...

Page 21: ... Turbo or Silence feature is activated Dispalys for three seconds when Timer OFF is set Dispalys for three seconds when Fresh Swing Turbo or Silence feature is cancelled Dispalys under deforsting operation Dispalys when anti cold air feature is activated under heating mode Dispalys during self clean operation if aplicable Dispalys under 8 heating operation if aplicable When ECO function optional i...

Page 22: ...the louver will be active immediately and the indoor fan will open 10s later If the unit runs in heating mode the indoor fan will be also controlled by anti cold wind function 8 3 7 Compressor preheating functions Preheating permitting condition When T4 outdoor ambient temperature 3 C 37 4 F the preheating function will be activated 8 3 8 Sensor protection at open circuit and breaking disconnectio...

Page 23: ...it will be run at different fan speed according to T4 For different outdoor units the fan speeds are different T 4 A A B C D E 8 4 2 2 Indoor fan running rules In cooling mode indoor fan runs all the time and the speed can be selected as high medium low and auto When the setting temp is reached if the compressor stop running indoor fan motor will run in Minimum speed or setting speed The indoor fa...

Page 24: ...orced operation function When the machine is off pressing the touch button will carry the machine to forced auto mode If pressing the button once again within 5 seconds the machine will turn into forced cooling mode In forced auto forced cooling or any other operation mode pressing touch button will turn off the machine 8 4 6 2 In forced operation mode all general protections and remote control ar...

Page 25: ...23 ...

Page 26: ...uiry information Displaying code Meaning T1 T1 T1 temp T2 T2 T2 temp T3 T3 T3 temp T4 T4 T4 temp T2B Tb T2B temp TP TP TP temp TH TH TH temp Targeted Frequency FT Targeted Frequency Actual Frequency Fr Actual Frequency Indoor fan speed IF Indoor fan speed Outdoor fan speed OF Outdoor fan speed EXV opening angle LA EXV opening angle Compressor continuous running time CT Compressor continuous runnin...

Page 27: ...31 139 E0 E1 E9 140 141 149 F0 F1 F9 150 151 159 Indoor fan speed Outdoor fan speed 0 OFF 1 2 3 4 Low speed Medium speed High speed Turbo For some big capacity motors 14 FF Actual fan speed Display value turns to decimal value and then multiply 10 The unit is RPM For some small capacity motors display value is from 14 FF hexadecimal the corresponding fan speed range is from 200 2550RPM EXV opening...

Page 28: ... electricity power in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION For other models please connect discharge resistance approx 100Ω 40W or soldering iron plug between terminals of the electrolytic capacitor on the contrary side of the outdoor PCB Note The picture above is only for reference The plug of your side may be different ...

Page 29: ...kage detection 1 times O F0 Overload current protection 2 times O F1 Outdoor ambient temperature sensor T4 open circuit or short circuit 3 times O F2 Condenser coil temperature sensor T3 open circuit or short circuit 4 times O F3 Compressor discharge temperature sensor T5 open circuit or short circuit 5 times O F4 Outdoor unit EEPROM parameter error 6 times O F5 Outdoor fan speed has been out of c...

Page 30: ... OCP1 COM1 HIN1 VB1 HS1 FO2 OCP2 FO1 LS1 U LS2 V LS3 W VBB VCC3 VB3 COM3 LIN3 OCP3 FO3 HS2 VB2 VCC2 HIN2 COM2 LIN2 VCC1 LIN1 HIN3 IPM1 BR1 PTC1 CN2 CN1 CN8 CN7 CN21 LED1 Yellow C6 R33 R16 C23 C7 L1 RY1 D3 D1 E8 R67 R66 R61 R57 R56 R53 R4 C9 CN19 AC_FAN D4 C28 C18 R77 D5 C54 R65 R64 R5 C52 ZR2 ZR1 RY5 RY4 RY3 RY2 R58 R55 R47 R46 R45 R44 R43 R42 R39 R36 R35 R32 R31 R30 R29 R21 R19 R18 R17 R15 R14 R1...

Page 31: ...tion normally X O 3 IPM malfunction or IGBT over strong current protection X P0 4 Over voltage or too low voltage protection O O P1 5 Over voltage or too low voltage protection O P1 6 Inverter compressor drive error X P4 7 Inverter compressor drive error O P4 8 Inverter compressor drive error P4 ...

Page 32: ...30 MOF1 22CDN1 MP5W ...

Page 33: ...stallation mistake PCB faulty Trouble shooting Yes Replace the indoor outdoor main PCB Power off then restart the unit 2 minutes later EEPROM a read only memory whose contents can be erased and reprogrammed using a pulsed voltage For the location of EEPROM chip please refer to the below photos Indoor PCB Outdoor PCB 18k model Note The two photos above are only for reference it s may be not same to...

Page 34: ...lution E1 Error Code E1 Malfunction decision conditions Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens four times continuously Supposed causes Wiring mistake Indoor or outdoor PCB faulty Trouble shooting ...

Page 35: ...ll move alternately between 50V to 50V If the outdoor unit has malfunction the voltage will move alternately with positive value While if the indoor unit has malfunction the voltage will be a certain value Remark Use a multimeter to test the resistance of the reactor which does not connect with capacitor The normal value should be around zero ohm Otherwise the reactor must have malfunction and nee...

Page 36: ...34 9 2 3 Zero crossing detection error diagnosis and solution E2 ...

Page 37: ...ion E3 Error Code E3 F5 Malfunction decision conditions When indoor fan speed keeps too low 300RPM for certain time the unit will stop and the LED will display the failure Supposed causes Wiring mistake Fan ass y faulty Fan motor faulty PCB faulty Trouble shooting ...

Page 38: ...gnal Voltage 1 Red Vs Vm 140V 190V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V 2 Outdoor DC Fan Motor control chip is in outdoor PCB Power on and check if the fan can run normally if the fan can run normally the PCB must has problems and need to be replaced If the fan can t run normally measure the resistance of each two pins If the resistance is not equal to each ...

Page 39: ...37 supply or 50V 115V power supply the PCB must has problems and need to be replaced ...

Page 40: ...sor diagnosis and solution E5 Error Code E4 E5 F1 F2 F3 Malfunction decision conditions If the sampling voltage is lower than 0 06V or higher than 4 94V the LED will display the failure Supposed causes Wiring mistake Sensor faulty PCB faulty Trouble shooting ...

Page 41: ...mpressor just starts running as Tcool In the beginning 5 minutes after the compressor starts up if T2 Tcool 2 C Tcool 35 6 F does not keep continuous 4 seconds and this situation happens 3 times the display area will show EC and AC will turn off Supposed causes T2 sensor faulty Indoor PCB faulty System problems such as leakage or blocking Trouble shooting ...

Page 42: ...d solution F0 Error Code F0 Malfunction decision conditions An abnormal current rise is detected by checking the specified current detection circuit Supposed causes Power supply problems System blockage PCB faulty Wiring mistake Compressor malfunction ...

Page 43: ... Code P0 Malfunction decision conditions When the voltage signal that IPM send to compressor drive chip is abnormal the display LED will show P0 and AC will turn off Supposed causes Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting ...

Page 44: ...42 For example P U P V Note The photos below are only for reference it s may be not same totally with the ones on your side ...

Page 45: ...43 P W N U ...

Page 46: ...44 N V N W ...

Page 47: ...on decision conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit Supposed causes Power supply problems System leakage or block PCB faulty Trouble shooting Remark Measure the DC voltage between P and N port The normal value should be around 310V P N ...

Page 48: ...compressor top diagnosis and solution P2 Error Code P2 Malfunction decision conditions If the sampling voltage is not 5V the LED will display the failure Supposed causes Power supply problems System leakage or block PCB faulty Trouble shooting ...

Page 49: ...bnormal inverter compressor drive is detected by a special detection circuit including communication signal detection voltage detection compressor rotation speed signal detection and so on Supposed causes Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting ...

Page 50: ... from PCB measure the resistance value with a tester Temperature sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge temp T5 sensor Measure the resistance value of each winding by using the multi meter ...

Page 51: ... 29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 37 1988 39 102 5 39689 79 174 1 2133 119 246 0 36954 0 32 35 2024 40 104 5 17519 80 176 1 17393 120 248 0 35982 1 34 33 3269 41 106 4 96392 81 178 1 13604 121 250 0 35042 2 36 31 5635 42 108 4 76253 82 180 1 09958 122 252 0 3413 3 37 29 9058 43 109 4 5705 83 181 1 06448 123 253 0 33246 4 39 28 3459 44 111 4 3873...

Page 52: ... 2 422 4 25 222 8 36 97 34 32 76 169 7 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 7 566 117 243 2 294 2 28 200 7 38 100 31 62 78 172 7 321 118 244 2 233 1 30 190 5 39 102 30 36 79 174 7 086 119 246 2 174 0 32 180 9 40 104 29 15 80 176 6 859 120 248 2 117 1 34 171 9 41 106 28 81 178 6 641 121 250 2 061 2 36 163 3 42 108 26 9 82 180 6 43 122 252 2 007 3 37 155 2 43 109 25 86 83 181 6 228 123 253...

Page 53: ...257 4 39 2 33 91 4 64 147 2 95 203 126 258 8 4 5 40 1 34 93 2 65 149 96 204 8 127 260 6 5 41 35 95 66 150 8 97 206 6 128 262 4 6 42 8 36 96 8 67 152 6 98 208 4 129 264 2 7 44 6 37 98 6 68 154 4 99 210 2 130 266 8 46 4 38 100 4 69 156 2 100 212 131 267 8 9 48 2 39 102 2 70 158 101 213 8 132 269 6 10 50 40 104 71 159 8 102 215 6 133 271 4 11 51 8 41 105 8 72 161 6 103 217 4 134 273 2 12 53 6 42 107 ...

Page 54: ...essor checking Measure the resistance value of each winding by using the tester Position Resistance Value ASN98D22UEZ ASM135D23UFZ DA150S1C 20FZ F Blue Red 1 57Ω 20 68 1 75Ω 20 68 0 95Ω 20 68 Blue Black Red Blue ...

Page 55: ...value Digital tester Normal resistance value Red Black Several MΩ Red Black Several MΩ P N U N U V V W W Red 4 Indoor AC Fan Motor Measure the resistance value of each winding by using the tester Position Resistance Value RPG20E YKFG 20 4 5 RPG28D YKFG 28 4 1 RPG45C YKFG 45 4 22 Black Red 388Ω 8 20 Brand Weiling 260Ω 8 20 Brand Weiling 168Ω 8 20 Brand Weiling White Black 360Ω 8 20 Brand Weiling 38...

Page 56: ...C ODT IDT 75 23 89 85 29 44 95 35 105 40 56 115 46 11 PSI 70 59 119 113 117 125 147 PSI 75 63 124 120 126 132 155 PSI 80 67 135 129 132 140 162 F C ODT IDT 75 23 89 85 29 44 95 35 105 40 56 115 46 11 MPA 70 59 0 82 0 78 0 81 0 86 1 01 MPA 75 63 0 86 0 83 0 87 0 91 1 07 MPA 80 67 0 93 0 89 0 91 0 96 1 12 0 0 2 0 4 0 6 0 8 0 10 0 12 0 75 23 89 85 29 44 95 35 105 40 56 115 46 11 70 59 75 63 80 67 ...

Page 57: ...11 37 33 2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 PSI 55 439 413 367 330 302 PSI 65 471 435 386 368 339 PSI 75 489 457 403 381 362 F C ODT IDT 57 53 13 89 11 67 47 43 8 33 6 11 37 33 2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 MPA 55 3 03 2 85 2 53 2 28 2 08 MPA 65 3 25 3 00 2 66 2 54 2 33 MPA 75 3 38 3 15 2 78 2 63 2 49 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 57 53 13 89 11 67 47 43 8 33 6 11 37 33...

Page 58: ...o Parts name Procedures Remarks 1 Front panel How to remove the front panel 1 Pull the below side of the panel toward you and remove the cover 2 Release the connector of the display ass y 3 Release the two clips and then remove the panel 4 Remove the filter and the horizontal louver 5 Remove the two screws and then remove the panel ass y ...

Page 59: ...t the room temp sensor T1 Remove the two screws for the ground connection 3 Remove the fixing screw 4 Pull out the coil temp sensor 5 From the side direction open the electronic control box cover fixing by clips Pull out the fan motor connector and swing motor connector Then remove the electronic control box ...

Page 60: ...emove the electrical parts from procedure 2 disassemble the pipe holder at the rear side of the unit 2 Remove the screws on the evaporator at the fixed plate 3 Remove the two screws on the evaporator at the base bearing side 4 Then pull out the evaporator ...

Page 61: ...an motor 1 Remove the front panel electrical parts and evaporator following procedure 1 3 2 Remove the two screws and remove the fixing board of fan motor 3 Remove the fixing screw 4 Pull out the fan motor and fan ass y from the side direction ...

Page 62: ...the top cover 8 screws 3 Remove the front panel 10 screws 4 Remove the side panel 11 screws 2 Fan ass y How to remove the fan ass y 1 Remove the panel plate from procedure 1 2 Remove the hex nut fixing the fan 3 Remove the fan 4 Disconnect the connector for fan motor from the electronic control board 5 Remove the fixing screws 4 pcs 6 Remove the fan motor 4screws Side panel Front panel Top cover ...

Page 63: ...e IPM 3 Remove the wires connected with 4 way valve 4 Remove the red wire connected with the capacitor Remove the blue wire connected with the reactor 5 Remove the temp sensor connectors Remove the ground wire of the compressor 6 Remove the two fixing screws 7 Remove the electronic control box 4 Compressor How to remove the Two blue wires ...

Page 64: ...orm work of item 1 2 3 2 Remove ground wire and remove the discharge pipe and suction pipe with a burner 3 Remove the nuts and washers fixing the compressor on bottom plate 4 Lift the compressor from the base pan assembly ...

Page 65: ...rews 3 Remove the front panel 10 screws 4 Remove the side panel 10 screws 2 Fan ass y How to remove the fan ass y 1 Remove the panel plate from procedure 1 2 Remove the hex nut fixing the fan 3 Remove the fan 4 Disconnect the connector for fan motor from the electronic control board 5 Remove the fixing screws 4 pcs 6 Remove the fan motor 3 Electrical parts How to remove the electrical 4 screws ...

Page 66: ...ith the four way valve 4 Remove the connectors for the condenser coil temp sensor T3 outdoor ambient temp sensor T4 and discharge temp sensor T5 two black connectors one white connector 5 Remove the ground wires 6 Remove the fixing screws 7 Remove the electronic control box 4 Compressor How to remove the compressor T3 T4 T5 two screws ...

Page 67: ...of item 1 2 3 2 Remove the ground wire and remove the discharge pipe and suction pipe with a burner 3 Remove the hex nuts and washers fixing the compressor on bottom plate 4 Lift the compressor from the base pan assembly ...

Page 68: ...ve the air outlet panel 9 screws 2 Fan ass y How to remove the fan ass y 1 Remove the panel plate from procedure 1 2 Remove the hex nut fixing the fan 3 Remove the fan 4 Disconnect the connectors for fan motor from the electronic control board There are blue wire red wire and black wire The blue wire and red wire are on the capacitor The black wire is connected with terminal four 5 Remove the fixi...

Page 69: ...m 1 2 2 Remove the screw on the middle metal plate 3 Remove the wires connected with the compressor Red wire connects with terminal one the blue wire and white wire connect with the compressor capacitor 4 Remove the wires connected with the 4 way valve 5 Remove the electrical parts 3 screws 3 pcs wires ...

Page 70: ...pressor 1 Perform work of item 1 2 3 2 Remove the ground wire and remove the discharge pipe and suction pipe with a burner 3 Remove the nuts and washers fixing the compressor on bottom plate 4 Lift the compressor from the base pan assembly ...

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