LG LFX25992 series Service Manual Download Page 50

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Checking flow

Check the Fan motor.
Rotate fan using your hand.
It feel sticky, change the motor.
(cause of ice or rust inside of motor).

Check the F Fan motor voltage.

Result & SVC Action

Below 12 V

0 or 5 V

(1) ~ (2)

(1) ~ (3)

Change the PCB

Change the motor

Point

Result

SVC Action

Sticky

Motor

Change the motor

Point

Result

SVC Action

<CON7>

(3) (2) (1)

Summary of Contents for LFX25992 series

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LFX25992 COLOR STAINLESS ST REFRIGERATOR SERVICE MANUAL ...

Page 2: ...AR 20 21 COVER FRONT 21 HOW TO REMOVE AND REINSTALL THE DOOR FOAM ASSEMBLY REFRIGERATOR 22 HOW TO REMOVE FRAME DOOR SWITCH OF DOOR FOAM 23 HOW TO REMOVE THE HOME BAR DOOR 24 4 ADJUSTMENT 25 COMPRESSOR 25 5 CIRCUIT DIAGRAM 26 6 TROUBLESHOOTING 27 7 PCB PICTURE 28 29 8 Troubleshooting With Error Display 30 41 9 Troubleshooting Without Error Display 42 50 10 Reference 51 56 11 COMPONENT TESTING INFOR...

Page 3: ...LE TRAY COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Spiral Condenser R 134a 135 g ISO10 280 ml SHEATH HEATER LED Module LED Module SPECIFICATIONS LAMP REFRIGERATOR FREEZER DIMENSIONS Depth w Handles Depth w o Handles Depth w o Door Depth Total with Door Open Height to Top of Case Height to Top of Door Hinge Width Width ...

Page 4: ...ows you to fill large containers such as an ice chest cooler or pitcher with ice F Basket This is a convenient feature that allows you to fill small frozen food beverage to needed quick cooling Glide N Serve When you want to store food items at a much lower temperature you can use the temperature controller to maintain the lowest possible chilling temperature without freezing LED interior lamps Th...

Page 5: ... pin and remove door 8 Place the door with the insides facing up on a not scratch surface CAUTION When lifting hinge free from the latch be careful that door does not fall forward Right Door FIG 3 1 Open the door remove 1 screw on the top of the hinge cover Loosen top hinge cover screw 1 Lift up cover 2 2 Disconnect door switch wire harness and remove the cover 3 Rotate hinge lever 3 clockwise Lif...

Page 6: ... Door Gasket Removal 2 Lift mullion up carefully 3 Disconnect wire harness Door Gasket Replacement 1 Insert gasket into channel Insert and press gasket into channels at doorliner 2 Insert mullion into channel Insert the mullion into channel at door as shown below Mullion Replacement 1 Connect wire harness 3 Assemble 2 screws Gasket Gasket Channel ...

Page 7: ...th the User Manual to adjust the bolt in the door hinge to adjust the height CW to raise or CCW to lower the height The Left refrigerator door has an adjustable nut located on the bottom hinge to raise and lower them to align properly If the space between your doors is uneven follow the instructions below to align the Left door evenly Use the wrench included with the Use Care Guide to turn the nut...

Page 8: ... with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap Figure 2 GRILLE ASSEMBLY DEFROST CONTROL ASSEMBLY Ice Fan Assembly Replacement 1 Remove the plastic guide for slides on left side by unscrewing phillips head screws 2 Pull out the cover sensor to disassemble by using tools shown in the figure 3 Pull out the cover grille to disassemble by using to...

Page 9: ... to remove the cover lamp 5 To remove the LED Assembly open the Hook part to pull it out as shown in the following picture Cover lamp Case lamp LED Assembly 3 To remove the case lamp and cover lamp release another 2 screws as following picture 3 6 2 Refrigerator Light Side 1 Unplug refrigerator power cord from electric outlet 2 Put flat screwdriver into sevice hole and remove cover of refrigerator...

Page 10: ...to service hole remove the cover of cap duct LED LAMP 5 Replace LED assembly 6 Assembly the cover in reverse order 4 Remove the LED assembly from connector 1 Remove 2 screws and guide rail 2 Remove the upper and lower Caps by using a flat screwdriver and remove 2 screws as shown figure 3 Disconnect the lead wire on the bottom position 4 Grip both side of multi duct pull it out ...

Page 11: ...spenser pull forward to remove 3 9 DISPLAY PCB As shown below remove 1 screw on the PCB fixing screw Remove the display PCB fixing screw 3 10 ICE BUTTON ASSEMBLY 1 Remove the 1 screw holding the lever 2 Remove the spring from the hook 3 Push and pull on the tab to remove CAUTION When replacing the dispenser cover make sure the lead wire does NOT come off and the water line is not pinched by the di...

Page 12: ...l slowly 3 Disconnect wire harness from wall of compartment In door motor 3 14 SUB PCB FOR WORKING DISPENSER 1 Disconnect the wire harness 2 Remove 1 screw from PCB and replace with new PCB CAUTION Make sure that the motor housing is taped to the mold if not positioned correctly the cover will not fit properly ...

Page 13: ...the Housing of the Cap Duct Motor 3 When replacing the motor check the position of the door duct and the link for proper fit Link Duct Door Cap Duct Motor NG Position 2 Unscrew 3 screws to disassemble the motor 4 Insert 2 screws 5 Push housing aside ...

Page 14: ...A ICE BIN 1 Grip the handles as shown 2 Tilt and lift slightly as shown 3 17 HOW TO INSERT A ICE BIN 1 Insert the Ice Bin slightly tilting to avoid touching the Icemaker Especially Ice Detecting Sensor 3 Remove ice bin slowly ...

Page 15: ...rom the guide rails one from each side Step 2 Remove the lower basket Step 4 Removal of the freezer door is done by l ifting clear of the rail support Fully extend both rails Step 5 Remove only 1 screw of gearice and disassemble the bar and gearice Step 6 Remove 2 screws of both side of supporter covers tv and disassemble the supporter cover tv ...

Page 16: ...the way into the freezer section Pull the rails back out to full extension Step 7 Reinstall the two screws into the guide rails one from each side Step 1 Insert both side of supporter cover tv into connector rails and then screw them Step 2 Assemble a bar and gear ice with screw Push the otherside of the gear to inside of the bar Step 3 Put gear ice assembled with the bar by screw into connector r...

Page 17: ...emove the clip and press the collet to separate the tube from the connector Note there maybe some water in the line Mechanical Cover Housing MOTOR COVER 2 Separate the Fan Assembly and Motor turn counter clockwise to remove from the motor shaft FAN ASSEMBLY MOTOR Assemble in reverse order Taking care to avoid 1 Do not to bend the tube during assembly 2 Press the Water Dispenser button letting wate...

Page 18: ...ails out to the full extension and insert the insert the back of the tray into both rails Then set the front of the tray into the rail and push it until you hear it click into place Middle Drawer 1 To remove the middle drawer Pull the drawer out to full extension Lift the front of the drawer up then pull it straight out 2 To install slightly tilt up the front and insert the drawer into the frame a...

Page 19: ...porator The 3 way valve has plastic parts inside so always wrap it with a wet cloth before servicing when using a torch 1 Always replace the 3 way valve if there is a leak at any one of the 3 tubes coming from it 2 Service in replacement of valve valve failure Perform service in the same method as above Note To service sealed system follow the directions in 3 22 and 3 23 above Then service is the ...

Page 20: ...stment 1 To remove the Door Baskets simply lifts the Door Baskets up and pulls straight out 2 To replace the Door Baskets slides it in above the desired support and push down until it snaps into place NOTE Some Door Baskets may vary in appearance and will only fit in one location 3 24 3 DOOR BASKET OF HOME BAR The Door Baskets of Homebar are removable for easy cleaning and adjustment 1 To remove t...

Page 21: ...e the Cover Front simply lifts the basket doorr up and pulls slopingly out 2 Remove two screws of The Cover Front and pull slopingly straight out NOTE To replace the Cover Front and basket door Slide them in above desired support and push down until them snaps into place 1 Remove three Screws on the Top of Frame Door 2 Pull Frame Door up and out ...

Page 22: ... REINSTALL THE DOOR FOAM ASSEMBLY REFRIGERATOR 1 Remove the Screw of Right Hinge Cover 2 Remove two Wire connectors 3 Rotate the hinge lever clockwise 5 Pull THE DOOR FOAM ASSEMBLY REFRIGERATOR up and out 4 Separate the Home Bar ...

Page 23: ...O REMOVE FRAME DOOR SWITCH OF DOOR FOAM 1 Remove screws on hinge assebmbly Upper 2 Separate the Cap decor on the frame door 4 Remove a wire connector for change 3 Press the hook of door switch Then pushes it outward ...

Page 24: ...move the screw located on the top of hinge 2 Remove the cap hinge upper 4 Pull out the bar thought the top hinge 3 Remove the bar by pushing it up from the bottom through the SVC hole bottom hinge Cap Hinge Upper 5 Separate the Cover Bar SVC Hole ...

Page 25: ...m IPM is LOW For every 416 7us check whether FO signal is LOW The trip occurs if it is found three times during the five periods 83ms 4 1 1 Role 4 1 COMPRESSOR The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high temperature and high pressure gas It then delivers the gas to the condenser 4 1 2 Note for Usage 1 Be carefu...

Page 26: ... 26 5 CIRCUIT DIAGRAM ...

Page 27: ...n Defrosting if Defrosting sensor is not over 40 F 5 C it is caused 8 Refrigerator Defrosting Error r dH 10 Flow Meter Sensor Defect Er gF Error of flow meter or water input or low water pressure Error of flow meter or water input or low water pressure or flow meter connection 11 Poor Defrosting Er dH Even though it is passed 1 hour since then Defrosting if Defrosting sensor is not over 46 F 8 C i...

Page 28: ... 28 7 PCB PICTURE 7 1 Main PCB P No MFG EBR730936 2011 01 Picture CON2 CON3 CON1 CON5 CON6 CON7 ...

Page 29: ... 29 7 2 Display PCB Sub PCB P No Display PCB EBR 729554 2011 03 Sub PCB EBR60070709 2011 01 Picture ...

Page 30: ...able 1 Result SVC Action 8 1 Freezer Sensor Error Er FS No 1 2 Checking flow Check for a loose connection Check the Blue White to Blue White Result SVC Action CON7 Temperature table 1 1 To 2 22 F C 13 F C 4 F C 5 F C 14 F C 23 F C 32 F C Result 40 30 23 17 13 10 8 The sensor is determined by the temperature For example 23 indicates 4 F ...

Page 31: ...sult SVC Action 8 2 Refrigerator Sensor Error Er rS No 1 2 Checking flow Check for a loose connection Check the White to White Result SVC Action Temperature table 2 1 To 2 23 F C 32 F C 41 F C 50 F C 59 F C Result 38 30 24 19 5 16 The sensor is determined by the temperature For example 30 indicates 32 F CON7 ...

Page 32: ... and resistance Table 1 Result SVC Action No 1 2 Checking flow Check for a loose connection Check the Blue to Blue Result SVC Action Temperature table 1 1 To 2 22 F C 13 F C 4 F C 5 F C 14 F C 23 F C 32 F C Result 40 30 23 17 13 10 8 The sensor is determined by the temperature For example 23 indicates 4 F CON5 ...

Page 33: ...ction 8 4 Defrost Sensor Error F dS No 1 2 Checking flow Check for a loose connection Check the Orange to Orange Result SVC Action Check the Brown to Brown Temperature table 3 1 To 2 23 F C 32 F C 41 F C 50 F C 59 F C Result 38 30 24 19 5 16 The sensor is determined by the temperature For example 23 indicates 4 F CON7 ...

Page 34: ...Action 8 5 Defrost Sensor Error R dS No 1 2 Checking flow Check for a loose connection Check the Orange to Orange Result SVC Action Check the Gray to Gray Temperature table 3 1 To 2 23 F C 32 F C 41 F C 50 F C 59 F C Result 38 30 24 19 5 16 The sensor is determined by the temperature For example 23 indicates 4 F CON7 ...

Page 35: ... flow Check the Door gasket Check the Defrost control part 3 Input Test 3 Mode Push the button 3 times 4 Check the Blue to Orange Result SVC Action Fuse M Def Heater Def Heater 5 Release the test mode push the button 1 times normal CON3 CON3 Result 112 116 V 0 V SVC Action Go to the 5 Replace Main PCB 6 Check the Blue to Orange Result 0 V 112 116 V SVC Action Explain to customer Replace Main PCB ...

Page 36: ... flow Check the Door gasket Check the Defrost control part 3 Input Test 3 Mode Push the button 3 times 4 Check the Blue to Yellow Result SVC Action Fuse M Def Heater Def Heater 5 Release the test mode push the button 1 times normal CON3 CON3 Result 112 116 V 0 V SVC Action Go to the 5 Replace Main PCB 6 Check the Blue to Yellow Result 0 V 112 116 V SVC Action Explain to customer Replace Main PCB ...

Page 37: ... Input Test 1 Mode Push the button 1 time Open the freezer door and Check the air flow 4 Check the Fan motor voltage Result SVC Action Below 12 V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action CON6 3 2 1 Status No windy Windy SVC Action Go to 3 Go to 4 ...

Page 38: ...r and Check the air flow 3 Check the Fan motor Rotate fan using your hand It feel sticky change the motor cause of ice or rust inside of motor 4 Check the Fan motor voltage Result SVC Action Below 12 V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action Status No windy Windy SVC Action Go to 3 Go to 4 CON7 3 2 1 ...

Page 39: ...n 1 time Open the freezer door and Check the air flow 3 Check the Connector Frozen caused the PCB short Result SVC Action Status No windy Windy SVC Action Go to the 3 4 Go to the 5 4 Check the Fan motor voltage Below 9 V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action CON7 3 2 1 ...

Page 40: ...heck the fan rotating 3 Check the Fan motor and surrounding Rotate fan using your hand It feel sticky change the motor Result SVC Action 4 Check the Fan motor voltage Status No windy Windy SVC Action Check motor Go to the 4 Below 10 V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action CON7 3 2 1 ...

Page 41: ...6 Check the White Red to White Black CON5 CON5 CON101 3 Check the Orange to White Red Result 0 or 5 V Other SVC Action Change the Display PCB Go to the 4 4 Check the White Black to White Red Result 0 or 5 V Other SVC Action Change the Main PCB Go to the 5 Result 0 or 5 V Other SVC Action Change the Display PCB Go to the 6 Result 0 or 5 V Other SVC Action Change the Main PCB Explain to customer CON...

Page 42: ...er S W 4 Check the resistance value CON1 CON3 Ice Maker Dispenser Motor 2 1 3 4 Pushing Not pushing 112 115 V Other 0 2 V Other Go to the 3 Change PCB Go to the 3 Change PCB Lever s w Result SVC Action Pushing Not pushing 9 12 V Other 0 2 V Other Go to the 4 Change PCB Go to the 4 Change PCB Lever s w Result SVC Action 1 to 2 3 to 4 31 1 42 1 Other 9 9 12 1 Other Explain Replace Geared Motor Expla...

Page 43: ... value Ice Maker Geared Motor Dispenser Motor 2 1 3 4 Pushing Not pushing 112 115 V Other 0 2 V Other Go to the 3 Change PCB Go to the 3 Change PCB Lever s w Result SVC Action Pushing Not pushing 9 12 V Other 0 2 V Other Go to the 4 Change PCB Go to the 4 Change PCB Lever s w Result SVC Action 1 to 2 3 to 4 31 1 42 1 Other 9 9 12 1 Other Explain Replace Geared Motor Explain Replace Geared Motor Po...

Page 44: ...oom Water Valve In door 1 to 2 3 to 4 360 420 Other 360 420 Other Explain Replace Water Valve Explain Replace Water Valve Point Result SVC Action 1 2 Dispenser Ice Maker 2 Check the Purple to White While pushing the lever S W Pushing Not pushing 112 115 V Other 0 2 V Other Go to the 3 Change PCB Go to the 3 Change PCB Lever s w Result SVC Action CON2 ...

Page 45: ...osed Open 0 2 V Other 12 V Other Explain to customer Change the Door S W Explain to customer Change the LED Lamp Status Result SVC Action Normal Push S W 0 not Infinity Other Go to the 3 Change door S W Go to the 3 Change door S W Status Result SVC Action Normal 12 V Other Go to the 4 Change the PCB Status Result SVC Action Normal 12 V Other Go to the 5 Change the LED Lamp Status Result SVC Action...

Page 46: ... Closed Open 0 2 V Other 12 V Other Explain to customer Change the Door S W Explain to customer Change the LED Lamp Status Result SVC Action Normal Push S W 0 Other Infinity Other Go to the 3 Change door Switch Go to the 3 Change door Switch Status Result SVC Action Normal 12 V Other Go to the 4 Change the PCB Status Result SVC Action Normal 12 V Other Go to the 5 Change the LED Lamp Status Result...

Page 47: ...flow The sensor is determined by the temperature For example 30 indicates 32 F Result SVC Action CON7 Temperature 23 F C 32 F C 41 F C 50 F C 59 F C Result 38 30 24 19 5 16 Status Windy No windy SVC Action Go to the 4 Check the R Fan motor Check the damper Go to the 6 5 Check the air temperature Cold or not Status Cold Not cold SVC Action Explain to customer Check the Compressor And sealed system ...

Page 48: ... 48 No Checking flow Result SVC Action 6 Check the R Fan motor voltage Below 12 V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action CON6 3 2 1 ...

Page 49: ... the air flow The sensor is determined by the temperature For example 23 indicates 4 F Result SVC Action CON7 Status Windy No windy SVC Action Go to the 4 Check the F Fan motor 4 Check the air temperature Cold or not Status Cold Not cold SVC Action Explain to customer Check the Compressor And sealed system 1 To 2 22 F C 13 F C 4 F C 5 F C 14 F C 23 F C 32 F C Result 40 30 23 17 13 10 8 ...

Page 50: ...d It feel sticky change the motor cause of ice or rust inside of motor 7 Check the F Fan motor voltage Result SVC Action Below 12 V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action Sticky Motor Change the motor Point Result SVC Action CON7 3 2 1 ...

Page 51: ...w to make TEST MODE If you push the test button on the Main PCB the refrigerator will be enter the TEST MODE 2 How to remove Terminal Position Assurance TPA 1 time Comp Damper All FAN on All things displayed 2 times Damper closed 22 22 displayed 3 times Forced defrost mode 33 33 displayed Main PCB AC TPA DC TPA ...

Page 52: ...3 F 5 C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 C 68 F 20 C 77 F 25 C 86 F 30 C 95 F 35 C 104 F 40 C RESISTANCE 73 29 53 63 39 66 29 62 22 33 16 99 13 05 10 10 7 88 6 19 4 91 3 91 3 14 2 54 2 07 1 69 1 39 VOLTAGE 4 09 V 3 84 V 3 55 V 3 23 V 2 89 V 2 56 V 2 23 V 1 92 V 1 63 V 1 38 V 1 16 V 0 97 V 0 81 V 0 67 V 0 56 V 0 47 V 0 39 V ...

Page 53: ...23 F 5 C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 C 68 F 20 C 77 F 25 C 86 F 30 C 95 F 35 C 104 F 40 C RESISTANCE 225 1 169 8 129 3 99 30 76 96 60 13 47 34 37 55 30 24 13 19 53 15 91 13 03 10 74 8 89 7 40 6 20 VOLTAGE 4 48 V 4 33 V 4 16 V 3 95 V 3 734 V 3 487 V 3 22 V 2 95 V 2 67 V 2 40 V 2 14 V 1 89 V 1 64 V 1 45 V 1 27 V 1 10 V 0 96 V ...

Page 54: ...oubleshooting Step 1 Open PCB cover Step 2 Check for blinking frequency of LED PCB If compressor is normal it does not blink Refer to the next page to find out what actions to take according to how many times LED blink ...

Page 55: ... on on off repeating piston constraint 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 3 If the same symptom arises after the second action replace compressor 3 LED six time repetiton on on on on on on off on on on on on on off repeating circuit overcurrent error 1 After resetting power check if it is running normal If the same ...

Page 56: ... is a fan motor malfunction this process is repeated 3 times If the fan motor is determined to be defective the error code will be shown in the display for 30 minutes At this point the process will be repeated until the fan motor operates normally If normal operation is achieved the error display is erased and the MICOM is reset automatically No signal Error Display 15s 10s 15s 10s 15s Normal driv...

Page 57: ...et a ohmmeter to the 2 housing pin Measure the 2 pin connected to Fuse M If the ohmmeter indicate below 0 1ohm fuse m is a good condition But if infinite the part is bad How to Measure Sensor Set a ohmmeter to The 2housing pin Measure the 2 pin connected to Sensor If the ohmmeter indicate 11 at room temperature Sensor is good When check the ohm at other temperatures Check the sensor manual Standar...

Page 58: ... when we check the resistance How to Measure Set a ohmmeter connect to The housing pins Measure the pins connected to Sheath Heater If the ohmmeter indicates V øV Watt R is on a good condition ex watt 350W voltage 115V R 115 ø115 350 38 Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 41 8 46 2 1 2 ...

Page 59: ...ot when we check the resistance How to Measure Set a ohmmeter connect to The housing pins Measure the pins connected to Sheath Heater If the ohmmeter indicates V øV Watt R is on a good condition ex watt 350W voltage 115V R 115 ø115 350 38 Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 78 6 86 8 1 2 ...

Page 60: ... 60 1 2 3 4 5 6 7 8 9 11 3 Door Heater Assembly Function The heater is designed for anti dew on the door How to Measure Standard Test Point 1 to 2 Ressult 2 3 2 9 ...

Page 61: ...ct operate on and off moving plunger of door switch up and down How to Measure Switch Freezer Switch Refrigerator Check the resistance between connectors 1 2 and 3 4 It means check whether or not applying an electric current If there is resistance the switch is good Standard Beep Beep Multimeter beep Switch F R Nomal Beep or 0 Push the button Plunger None Button Plunger 1 2 3 4 3 4 2 1 1 2 3 4 ...

Page 62: ... DC Motor Function Dispenser DC Motor When customer push the dispenser button Pull duct door and abstract from ice bank How to Measure Standard Dispensor DC Motor Dispenser DC Motor Test Points 1 to 2 Result 9 9 12 1 1 2 ...

Page 63: ...Solenoid Test Points 1 to 3 Result 31 1 42 09 Separate the housing Measure the resistance between 1 and 2 Check the resistance between connectors In door motor 1 2 and In door motor 1 3 It means check whether or not applying an Electric current If there is resistance it means the geared motor or solenoid is not inferiority 1 2 3 1 1 2 Separate the housing Measure the resistance between 1 and 3 1 2...

Page 64: ... the damper is closed the chill rooms temperature will rise How to Measure Damper Circuit extension Check the Standard Damper Test Points Red and Yellow Result 373 456 Test Points Blue and White Result 373 456 Check to see if there is electrical current if there is resistance the damper is good 1 Blue 1 Blue 2 Red 3 White 3 White 1 3 Check the 2 4 Check the 1 3 3 Yellow ...

Page 65: ...r lamp assembly The lamp socket supply electric source to lamp also How to Measure Standard Check the resistance between connector of housing and connector of lamp socket It means check whether or not applying an electric current If there is resistance it means the lamp socket is good Test Points 1 to 2 and 3 to 4 Result 0 1 2 3 4 ...

Page 66: ...Sensor Function Flow Sensor in machine room Count the water quantity from city water to water filter in refrigerator How to Measure Standard Flow Sensor in machine room Test Points Red wire to Black wire Result 4 30 ...

Page 67: ...ink2 LED blink6 Reset Reset Reset Reset LED blink 1 LED blink 7 Replace Driver PCB Comp Check Replace Driver PCB LED blink 5 LED blink2 Heavy Repair Heavy Repair Comp Work Comp Check Replace Comp Comp Work Comp Check Harness Check Leakage Recheck Reset LED blink6 Heavy Repair Heavy Repair Recheck Replace Driver PCB Comp Work Comp Check Refrigerant leak IPM output 80V 20 Refrigerant leak Recheck Fi...

Page 68: ... is PC Board located in the PCB case The control driver is PC board for the compressor This step shows the source voltage of the driver PC board Driver PCB located in machine room Step1 Open PCB Cover Step2 Check Driver PCB ...

Page 69: ...ssor is receiving voltage from IPM In order to determine whether the compressor is operating normally check the output voltage during the refrigeration cycle After initial power up when the compressor begins to operate wait 10 minutes before checking The compressor is operating normally if the voltage is greater than 80V IPM Output check ...

Page 70: ...mes Stroke Trip Check B2 Compressor Doesn t work Y N Compressor Works Intermittently Capacitor Spec Check C Compressor Damage Check C Replace Capacitor Replace Compressor N N Reset Power Stroke Trip Occur Y Repeat Check Procedure Harness Connecting Check C Fix Harness N N Cycle Check E Fix Cycle Replace Driver PCB OK NG Purpose Prevent abnormally long piston strokes Case 1 If compressor doesn t wo...

Page 71: ... off and tries to restart within 2 5 minutes B4 LED blinks six times then repeats Current Trip A E Inverters Blink Blink Blink Blink Blink Blink OFF Protection logic Check B Blink 6 time Current Trip Check B4 Compressor Intermittently works Y Capacitor Spec Check C2 Compressor Damage Check C3 Replace Capacitor Replace Compressor NG NG Reset Power Y Current trip Occur Y Repeat Check Procedure IPM C...

Page 72: ...ck B5 Compressor Doesn t work Y N Repeat Check Procedure Replace Drive PCB N Y Check IPM visual inspection turn off Short Test Point A Power Reset Compressor Damage Check C3 Replace Compressor NG Y Modify Purpose Prevent high current due to IPM Short Cause Damaged IPM Dead Short Test for a dead short at Point A with a VOM Logic Compressor is forced off and tries to restart in 20 seconds A ...

Page 73: ...m Replace Compressor Problem B D Check wiring to compressor Y N N Y Y Y N N Check Compressor terminals Harness Problem Y N Y Measure the resistance at each point except point C Dead short check measure the resistance between power line in compressor and earth ground in refrigerator Inf Ohm Dead short check P C Multi Tester Resistance FC75LBNA Co Po N C Capacitor Spec 450V 18ఒ F੬5 Po Power Co Commo...

Page 74: ... will flow out with the refrigerant at leak point ઔ Temp of compressor and discharge line is normal to slightly higher High side pressure is normal to slightly higher than normal conditions This is because condenser cannot condense the air that is trapped in the condenser The high side pressure and temperature will not mimic the low side pressures and temperatures Over charging Refrigerant Low sid...

Page 75: ... WARNING HIGH VOLTAGE Step 1 Open PCB cover Step 2 Check for blinking frequency of LED and PCB When compressor is normal it does not blink Refer to the next page to find out what actions to take according to how many times LED blink ...

Page 76: ...r the second action replace compressor Circuit over current error Or cycle error 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action 3 If the same symptom arises after the second action replace compressor PCB parts defect IPM 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 1 ...

Page 77: ...rly Seal liquid foods with wrap Put in foods after they have cooled down Don t open the door too often and close it firmly Condensation forms in the Exterior Case Check if the ambient temperature and humidity of the surrounding air are high Is there a gap in the door gasket Wipe moisture with a dry cloth It will disappear in low temperature and humidity Fill up the gap There is abnormal noise Is t...

Page 78: ...ing of the Refrigerant MOISTURE CLOG Cooling operation stops periodically Flowing sound of refrigerant is not heard and frost melts Lower than ambient temperature Cooling operation restarts when heating the inlet of the capillary tube CLOGGED BY DUST COMP RESSION Freezer and Refrigerator don t cool Low flowing sound of refrigerant is heard and frost forms in inlet only A little higher than ambient...

Page 79: ...Test Very Slow None Equalization Test Very Fast Fast Very Fast Inefficient Compressor Partial Restriction Complete Restriction Condenser Temperature Cap Tube Sound Yes No Air Low Side Leak Loss of Change Very Slow Faint Hotter than Normal None to Weak Room Temperature Compressor Not Pumping Trace of Oil Undercharge The equalization test is trying to restart a compressor using a start kit after it ...

Page 80: ...ply water to the ice tray by operating the solenoid valve To force water to supply to the ice tray or check icemaker s condition press and hold the FILL Key for about 3seconds In the test mode The icemaker will run through 3 stages step by step Harvest Fill water Ice making To reset the icemaker s operation set the power switch OFF position and back it to ON position Icemaker Unit Power Switch Ice...

Page 81: ... passed to make one series of ices after water comes into icemaker Test Mode should not be carried out before checking below 13 2 3 Fill Park Position Once the normal harvest mode has been completed the water solenoid will be activated Not making ice Water Yes Yes No No No Temperature Time Is Icemaker s tray filled with water or Ice Is measured temperature below 10 F in the icemaker compartment Ho...

Page 82: ...agnosed Follow the procedure step by step to check to see if icemaker and Ice detecting sensor is working normally 1st STEP Icemaker Unit Diagnosis Press the fill key for about 3sec If the icemaker runs 2 stages of harvest and filling water step by step It means icemaker s mechanism is normal Caution Be sure that the ice tray is not filled with water before pressing fill key Icemaker Unit Fill Key...

Page 83: ...ould get into the compartment and make ices get stuck Replace the cap duct with new one In door geared motor doesn t work Resolution Change the in door geared motor and test it The water comes out of fill cup and the water get into the ice bin Resolution The water pressure from shutoff valve is too high Recommend to use regulator to the customer and close the shutoff valve slightly Clogged Ices In...

Page 84: ...isplay between F C 1 The initial setting is F and the display temperature mode can be changed from F to C or C to F by pressing and holding the FRZ TEMP and the REF TEMP keys at the same time for over 5 seconds 14 1 3 Lock function dispenser and display button lock 5 If you don t hold the Alarm Lock button more than 3 seconds Alarm function will be changed and alarm for opened door will be on off ...

Page 85: ...save you can turn on energy saving some heater off for anti dew 5 To turn on or off the energy saving function press Ice plus Energy saving Button for more than 3 seconds 6 We recommend using energy saving function when you go out for quite a long time and are out of the rainy season 14 1 7 Dispenser use selection You can select water or ice by separated pad switch When you press ice type button i...

Page 86: ...e display mode and cancel it 1 With the refrigerator door open keep pressing the Refrigerator Temp Button and ICE PLUS Button more than 5 seconds then it goes to the display mode with Special Beep Sound With Special Beep Sound 2 Perform the same way again to cancel the display mode 3 All Freezing unit will be turned off at display mode Exceptions Lamp Display 14 1 8 CONTROL OF FREEZER FAN MOTOR 1 ...

Page 87: ...upon the selected Auto Pantry temperature control 2 You can adjust the Pantry control with three different temperature ranges by pressing the Temp Selector button 14 1 15 Defect Diagnosis Function 1 Automatic diagnosis makes servicing the refrigerator easy 2 When a defect occurs the buttons will not operate but the tones such as ding will sound 3 When the defect CODE removes the sign it returns to...

Page 88: ...0C 610B 405C 405F 407A 315A 106A 106A 313A 411A 500A 410J S02 S11 S11 406D B01 610D 402A S04 207A 402A B02 249C 262B S14 302B 400A 408A 302C 401A 408B 310B 306A 300A 314A 317A 318A 301A 308B 403B 312C 312D 262H 404A S14 410G 624C 624G 626A 603C 603E 624E 500P 105A 619D 409F 405J 405K 406B 249D S10 145B 271D 315C 315B 315C 315B 103B 103A 610F 145A 120A 409H 282G 405L 405G 404C 405E 405I 327B 628A 6...

Page 89: ...FREEZER PARTS CAUTION Use the part number to order part not the position number 237C 132P 136A 131A 136B 136C 249M 133C 133C 132Q 249L 136E 134A S04 S04 145G 145J 145K 145C 145F 145M 145J 145H ...

Page 90: ...ARTS CAUTION Use the part number to order part not the position number 142D 142A 142B 143A 141F 141B 141H 141A 141F 141B 141H 141A 141F 141B 141H 141A 141D 154A 146E 161A 151A 161C 151C 161C 151B 161B 162A 162B 145D ...

Page 91: ...49J 250B S05 249F 250B 619C 249E 241L 241K 241K 241K 312B 624A 405M 409I 405M 409I S05 241N 212G 231A B06 B06 244F 406E 241E 231C 233C 279M 241D 241C 241F 232B 233A 271E 241M 250E 241J 402B 406G S14 243A 406F S14 S08 S02 S03 276D 406H 406J S14 406I 262F WSZ064 241A 250C 241B 250D 232A 281H 207D 241B 250D 250F 312F 207C 312E 146F 312G 281B 281H 206L 206K B06 212D B06 ...

Page 92: ...DISPENSER PARTS CAUTION Use the part number to order part not the position number 279B 276A 276B 405A 281A 500C 501A 279C 279A 276F 276G 276I 278C 501D 279L 278D 279K 275A 402E 402C ...

Page 93: ...VALVE WATER TUBE PARTS CAUTION Use the part number to order part not the position number 617A 625A 616G 623B 616J 616G 623B 616J 603C 616D 616D S04 616F 627B S04 619E 627A S04 603B 619A ...

Page 94: ...ICE MAKER ICE BIN PARTS CAUTION Use the part number to order part not the position number 600A 630F 630B 630A 630H 630G 630C 630Q 630E 630D 611A 612A 606A 630J 630J 607A ...

Page 95: ...P No MFL67655010 NOV 2012 Printed in Korea ...

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LG LFX25992 series, Service Manual

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Summary of Contents for LFX25992 series

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