LG GB7143**AV Series User manual

CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
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MODEL : COLOR :
REFRIGERATOR
SERVICE MANUAL
Ref. No.
GB7143**GZ
GB7143**HZ
Ref. No.
GB7143**RZ
GB7138**XZ
Ref. No.
GB7143**RZ
GB7138**XZ
Ref. No.
GB7143**AV
GB7143**BV

- 2 -
CONTENTS
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
SERVICING PRECAUTIONS ...................................................................................................................................................3
SPECIFICATIONS ................................................................................................................ ................................................4-5
PARTS IDENTIFICATION .....................................................................................................................................................6-9
INSTRUCTIONS FOR REVERSING DOOR SWING ........................................................................................................10-12
DISASSEMBLY .................................................................................................................................................................13-15
DOOR ................................................................................................................................................................................13
DOOR SWITCH .................................................................................................................................................................13
REFRIGERATOR ROOM LAMP ........................................................................................................................................13
FAN AND FAN MOTOR .....................................................................................................................................................14
DEFROST CONTROL ASSEMBLY ...................................................................................................................................14
FRIDGE HEATER, SHEATH .............................................................................................................................................15
FREEZER HEATER, SHEATH ..........................................................................................................................................15
CASE ASSEMBLY, PUMP DISASSEMBLY ......................................................................................................................16
COMPRESSOR .................................................................................................................................................................17-22
INVERTER LINEAR COMPRESSOR ...........................................................................................................................17-22
HEAVY REPAIR METHOD OF REFRIGERATOR BY APPLICATION OF REFRIGERANT ................................................23
OUTLINE ............................................................................................................................................................................23
HEAVY REPAIR SVC METHOD ..................................................................................................................................24-29
CIRCUIT DIAGRAM ...............................................................................................................................................................30
TROUBLESHOOTING (MECHANICAl PART) .................................................................................................................31-35
ANOTHER ELECTRIC COMPONENTS ............................................................................................................................31
SERVICE DIAGNOSIS CHART .........................................................................................................................................32
REFRIGERATING CYCLE ...........................................................................................................................................33-35
MICOM FUNCTION & PCB CIRCUIT EXPLANATION ....................................................................................................36-43
MICOM ERROR CODE ..........................................................................................................................................................43
PCB PICTURE ..................................................................................................................................................................44-45
TROUBLESHOOTING WITH ERROR DISPLAY .............................................................................................................46-56
TROUBLESHOOTING WITHOUT ERROR DISPLAY ......................................................................................................57-65
REFERENCE ..................................................................................................................... ...............................................66-70
EXPLODED VIEW &REPLACEMENT PARTS LIST ........................................................................................................71-83
SAFETY PRECAUTIONS
Please read the following instructions before servicing your
refrigerator.
1. Check the set for electric losses.
2. Unplug prior to servcing to prevent electric shock.
3. Whenever testing with power on, wear rubber gloves to
prevent electric shock.
4. If you use any kind of appliance, check regular current,
voltage and capacity.
5. Don't touch metal products in the freezer with wet
hands. This may cause frostbite.
6. Prevent water from following onto electric elements in
the mechanical parts.
7. When standing up after having checked the lower
section of the refrigerator with the upper door open,
move with care to avoid hitting the upper door.
8. When tilting the set, remove any materials on the set,
especially the thin plates(ex. Glass shelf or books.)
9. When servicing the evaporator, wear cotton gloves.
This is to prevent injuries from the sharp evaporator fins.
10.Leave the disassembly of the refrigerating cycle to a
specialized service center. The gas inside the circuit
may pollute the environment.
11.When you discharge the refrigerant, wear the protective
safety glasses or goggle for eye safety.
12.When you repair the cycle system in refrigerator, the
work area is well ventilated.
Especially if the refrigerant is R600a, there are no fire or
heat sources. (No smoking)

- 3 -
SERVICING PRECAUTIONS
Features of refrigerant (R600a)
•Achromatic and odor less gas.
•Flammable gas and the ignition (explosion) at 494°C.
•Upper/lower explosion limit: 1.8%~8.4%/Vol.
Features of the R600a refrigerator
•Charging of 60% refrigerant compared with a R134a model.
•The suction pressure is below 1bar (abs) during the operation.
•Because of its low suction pressure, the external air may flow
in the cycle system when the refrigerant leak, and it causes
malfunction in the compressor.
•The displacement of compressor using R600a must be at
least 1.7 times larger than that of R134a.
•Any type of dryer is applicable (XH-5, 7, 9).
•The EVAPORATOR or any other cycle part that has welding
joint is hidden in the foam. (If not hidden inside, the whole
electric parts must be tested with the LEAKAGE TEST
according to the IEC Standard.)
•The compressor has label of the refrigerant R600a.
•Only the SVC man must have an access to the system.
After the refrigerant (R600a) is completely discharged, repair
any defective parts and replace the dryer. At any case you
must use the LOKRING for connecting or replacing any part in
the cycle (No Fire, No Welding). Connect the Schrader valve
to pump with the coupler. And then turn the pump on for
vacuum state (Figure 3). Let the pump run until the low-
pressure gauge indicates the vacuum (gauge pressure 0,
absolute pressure -1atm or -760mmHg). Recommended
vacuum time is 30 min. Charge the N2gas in order to check for
leakage from welding points and the LOKRING. If leakages
are found, repair the defects and repeat the vacuum process.
After the system is completely vacuumed, fill it with the
refrigerant R600a up to what has been specified at your
refrigerator Name Plate. The amount of refrigerant (R600a)
must be precisely measured within the error of ±2g by an
electron scale (Figure 4).
If you use the manifold connected with both the refrigerant
(R600a) cylinder and the vacuum pump simultaneously, make
sure the pump valve is closed (Figure 5).
Connect the charging hose (that is connected to the
refrigerant (R600a) cylinder) to the Schrader valve installed
on the service tube. Then, charge the refrigerant (R600a) by
controlling the Throttle valve. When you do so, do not fully
open the Throttle valve because it may make damage to the
compressor. Gradually charge the refrigerant (R600a) by
changing open and close the Throttle Valve (5g at each time).
The charging hose must use a one-way valve to prevent the
refrigerant refluence. Close the Schrader valve cap after the
refrigerant (R600a) is completely recharged.
After you completely recharge the refrigerant (R600a),
perform the leakage test by using a portable leakage detector
or soapy water. Test the low pressure (suction) parts in
compressor off time and high pressure parts in compressor
on time. If the leakages are found, restart from the refrigerant
(R600a) discharging process and repairs defects of leaks.
After the leakage test, check the temperature of each parts of
the cycle. Check with hands if the CONDENSER and the
case (HOT-LINE pipe) that is contacted to the door gasket
are warm. Confirm that frost is uniform distributed on the
surface of the EVAPORATOR.
Installation place
• Must be well ventilated.
• Must be 20 m3or larger.
• Must be no-smoking area.
• No ignitable factors must be present.
Utilities
• Refrigerant cylinder (MAX NET 300g)
• Manometer
• Vacuum pump (600 /min)
• Piercing Clamp
• Quick coupler
• Hoses (5m-1EA, 1m-3EA)
• LOKRING
• Portable Leakage detector (3g/year )
• Nitrogen cylinder (for leakage test)
• Concentration gauge
Make sure before Servicing
•Refrigerant
Confirm the refrigerant by checking Name Plate and the label
on the compressor, after opening the COVER ASSEMBLY,
BACK-M/C.
•If the refrigerant is R600a, you must not weld or apply a heat
source.
Air Recharging in Compressor
Before refilling the refrigerant, you must perform the test
according to Chapter 5 (TROUBLESHOOTING CHART). When
the defects are found, you must discharge the residual
refrigerant (R600a) in the outdoor. For discharging the
refrigerant R600a, break the narrow portion of tube extension
by hand or with a pipe cutter as shown in Figure 1. Leave it for
30min in outside to stabilize the pressure with ambient. Then,
check the pressure by piercing the dryer part with piercing
pliers. If the refrigerant is not completely discharged, let the
refrigerator alone for more 30min in outside.
Attach the service tube installed with a Schrader valve (one-
way valve) by using the LOKRING (Figure 2). Then, connect
the Schrader valve (one-way valve) to the pump that is
connected to the discharging hose leading to the outside.
When discharging the residual refrigerant, repeat 3 cycle that
includes 3min of the pump running->pump off->30sec of the
compressor running.
Figure 1 Figure 2
Figure 3
Figure 4
Figure 5

- 4 -
SPECIFICATIONS
1. Ref. No: GB7143*****
NET WEIGHT
COOLING SYSTEM
TEMPERATURE CONTROL
REFRIGERANT WEIGHT
COMPRESSOR
EVAPORATOR
CONDENSER
DIMENSIONS (mm)
DEFROSTING SYSTEM
DEFROSTING DEVICE
REFRIGERATOR
COMPARTMENT
DOOR BASKET
FREEZER
COMPARTMENT
LUBRICATION OIL
ITEMS
595(W) X 2010(H) X 671(D)
595(W) X 1850(H) X 671(D)
-
Fan Cooling
Micom Control
Full Automatic
Heater Defrost
Heater, Sheath
Heater, L-Cord
R600a
FREOL 60MT 310 cc
FREOL 55MT 180 cc
PTC Starting Type
Pin Tube Type
Wire Condenser
Removable Glass Shelf
Bottle Rack (1EA)
Vita, LED(1EA)
Cover, TV (1EA)
Rail (2EA)
Magic Crisper (1EA)
Vegetable Drawer (1EA)
OPTI-Zone (1EA)
Egg Tray
Dairy Corner
Basket Door
Basket
Water Tank
Tray Drawer (3EA)
Ice bin (1EA)
Twist Ice Maker Kit (1EA)
Auto Ice Maker
Guide, Rail (1EA)
Wire Shelf (2EA)
73g
-
3EA
-
GB7143**(A/B)V
73g
-
3EA
-
GB7143**(G/H)Z
71g
-
3EA
-
GB7143**(G/H)W

- 5 -
2. Ref. No: GB71(43/38)*****
NET WEIGHT
COOLING SYSTEM
TEMPERATURE CONTROL
REFRIGERANT WEIGHT
COMPRESSOR
EVAPORATOR
CONDENSER
DIMENSIONS (mm)
DEFROSTING SYSTEM
DEFROSTING DEVICE
REFRIGERATOR
COMPARTMENT
DOOR BASKET
FREEZER
COMPARTMENT
LUBRICATION OIL
ITEMS
595(W) X 2010(H) X 671(D)
595(W) X 1850(H) X 671(D)
-
Fan Cooling
Micom Control
Full Automatic
Heater Defrost
Heater, Sheath
Heater, L-Cord
R600a
FREOL 60MT 310 cc
FREOL 55MT 180 cc
PTC Starting Type
Pin Tube Type
Wire Condenser
Removable Glass Shelf
Bottle Rack (1EA)
Vita, LED(1EA)
Cover, TV (1EA)
Rail (2EA)
Magic Crisper (1EA)
Vegetable Drawer (1EA)
OPTI-Zone (1EA)
Egg Tray
Dairy Corner
Basket Door
Basket
Water Tank
Tray Drawer (3EA)
Ice bin (1EA)
Twist Ice Maker Kit (1EA)
Auto Ice Maker
Guide, Rail (1EA)
Wire Shelf (2EA)
71g
-
3EA or 2EA
-
-
-
2EA
-
-
-
-
GB71(43/38)**(R/X)W
73g
-
3EA or 2EA
-
-
-
2EA
-
-
-
-
GB71(43/38)**(R/X)Z
-
71g
-
3EA or 2EA
-
-
-
2EA
-
-
-
GB71(43/38)**(P/V)W

- 6 -
PARTS IDENTIFICATION
GB7143**(A/B)V
Lamp
Dairy Corner
Egg Tray
Basket Door
Water Tank
(Optional)
Water Pump
(Optional)
Basket Door
EZ Open Handle
(Optional)
Removable
Glass Shelf
Bottle Rack
OPTI-Zone
(Optional)
Auto Twisting
Ice Maker
Ice Box
Freezer
Compartment
Wire Shelf
Leveling Screw
Vegetable Drawer
Used to keep fruits
and vegetables etc.
fresh and crisper
Water Tank

- 7 -
GB7143**(G/H)W/Z
Lamp
Dairy Corner
Egg Tray
Basket Door
Water Tank
(Optional)
Water Pump
(Optional)
Basket Door
EZ Open Handle
(Optional)
Removable
Glass Shelf
Bottle Rack
OPTI-Zone
(Optional)
Twist Ice Tray
Ice Box
Freezer
Compartment
Wire Shelf
Leveling Screw
Vegetable Drawer
Used to keep fruits
and vegetables etc.
fresh and crisper

- 8 -
GB7143**PW, GB7143**R(W/Z)
Lamp
Dairy Corner
Egg Tray
Basket Door
Water Tank
(Optional)
Water Pump
(Optional)
Basket Door
EZ Open Handle
(Optional)
Removable
Glass Shelf
Bottle Rack
Fresh 0 Zone
Twist Ice Tray
Ice Box
Freezer
Compartment
Wire Shelf
Leveling Screw
Vegetable Drawer
Used to keep fruits
and vegetables etc.
fresh and crisper

- 9 -
Lamp
Dairy Corner
Egg Tray
Water Tank
(Optional)
Water Pump
(Optional)
Basket Door
Basket Door
EZ Open Handle
(Optional)
Removable
Glass Shelf
Bottle Rack
Vegetable Drawer
Used to keep fruits
and vegetables etc.
fresh and crisper
Twist Ice Tray
Ice Box
Freezer
Compartment
Wire Shelf
Leveling Screw
Fresh 0 Zone
GB7138**VW, GB7138**X(W/Z)

- 10 -
INSTRUCTIONS FOR REVERSING DOOR SWING
This refrigerator allows the owner to change the door swing if desired. The hinging of the doors can be changed
to the opposite side anytime you wish.
When reversing the door swing :
Read the instructions all the way through before starting.
Handle parts carefully to avoid scratching paint.
Set screws down by their related parts to avoid using them in the wrong places.
Provide a non-scratching work surface for the doors.
IMPORTANT
Once you begin, do not move the cabinet until door-swing reversal is completed.
These instructions are for changing the hinges from the right side to the left side-if you ever want to change the hinges back
to the right side, follow these same instructions and reverse all references to left and right.
Befor Removing the Doors, empty and Remove all the Door Baskets of both Refrigerator/Freezer Doors, including the Bank
Dairy. Close both doors before removing hinge pins.
Caution :
Do not let either door drop to the floor. Doing so could damage the Door Stop.
Warning Electric Shock Hazard
Disconnect electrical supply to refrigerator before installing. Failure to do so could result in death or serious injury.

- 11 -
1) Remove screws(3) after removing a CAP(2) from the side
of the refrigerator room HANDLE(1).
The freezer room HANDLE(5) may be also disassembled in
a same may as the refrigerator room HANDLE(1).
(2)
(4)
(4)
(1)
(5)
(3)
(2) (3)
2) Remove the screws(6) in the DECO COVER(7).
Remove the DECO COVER(7) and move the COVER
HINGE(8) to side of DECO COVER(7). Disassemble the
Housing Connector(9) inside of the DECO COVER(7).
3) Remove the screws(10) in the COVER-PWB(11), and
remove the COVER-PWB(11).
4) Remove the screws(12) in the TOP COVER FRONT(13)
and remove the TOP COVER FRONT (13).
5) Remove the HOLDER CORD (14) placed in right and insert
it to center. And then move COVER FRONT(16).
Take out the HOLDER CORD(spare) (15) and to place in
the center of TOP COVER FRONT(13), and insert to the
left side.
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$
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- 12 -
6) Take out the LEAD WIRE(17) assembly from the TOP
COVER FRONT(13) and assemble it on left side.
7) Remove bolts(18) securing HINGE-U(19). Unscrew of the
hinge pin(20).
Place HINGE-U and seat hinge upside down and apply
them to left side of the refrigerator.
NOTE: Seat hinge to be placed under the HINGEU(19).
8) Remove bolts(22) securing HINGEC(23) and then remove
HINGE-C(23).
Remove the freezer door. Move in left side of the
refrigerator CAP(24). Move to left side of the refrigerator
door BRACKET DOOR(25) and screw(26).
10) Assemble the HINGE-L Freezer Door HINGE-C(23) Refrigerator Door HINGE-U(19)
TOP COVER FRONT(13) COVER PWB(11) Connect the Housing Connector(9) DECO COVER(7)
HANDLE(1) (5)
Note:
Reversing the doors is not covered by the warranty.
9) Remove Bolts(27), HINGE-L(28), Stopper(29), (30) and
Lavel(31).
Use the new HINGE-L in Drawer and attach a label to a
screw Hole.
(29) (30)
(32)
(27)

- 13 -
DISASSEMBLY
1. DOOR
Freezer Door
1) Refer to previous chapter "Instruction for Reversing
Door Swing".
2) Pull out the Door Gasket to remover from the Door
Foam Assembly, F.
2. DOOR SWITCH
1) Unplug the power cord from the outlet.
2) Loosen six screws in upper part and disconnect Top
Cover Front.
3) Disconnect Lead Wire from switch.
4) Disengage hook behind the switch by pressing it with
hands.
Refrigerator Door
1) Refer to previous chapter "Instruction for Reversing
Door Swing".
2) Pull out the Door Gasket to remove from the Door
Foam Assembly, R.
GASKET
Figure 7
Figure 9
3. REFRIGERATOR ROOM LAMP
1) Unplug the power cork the outlet.
2) Remove all of the fridge compartment,
(Involved removable glass shelf, wine rack etc.)
3) Remove one screws in Case, Control Refrigerator.
4) Pull out the Grille Fan and Case, Control Refrigerator.
5) Disconnect the Housing of lead wire.
6) Replace new one.
7) Assembly in reverse order of disassembly.
8) Replacement LED must be the same specification as
original.
Figure 10
Don’t touch the LED, in case of light on the long time.
Because it can be very hot.
LED capacity is MAX 8W (GB7138**** MODEL : 6W).
The LED will remain “ON” for 7minutes if the door is left
open and then it is “OFF” for safety.
(If you reopen the door, the lamp is “On”.)

- 14 -
Figure 11
SHROUD
FAN MOTOR
ASSEMBLY
BRACKET
HEATER,
SHEATH
5. DEFROST CONTROL ASSEMBLY
Defrost Control Assembly consists of Thermistor and Fuse,
Melting. Thermistor functions to defrost automatically and it
is attached to metal side of the Evaporator and senses
temperature.
Fuse, Melting is a kind of safety device for preventing
overheating of the Heater when defrosting.
At the temperature of 77 , it stops the emission of heat
from the Heater.
1) Pull out the Shroud, F after removing the Grille.
- Freezer
Pull out the Grille. - Fridge
2) Separate the connector connected with the Defrost
Control Assembly and replace new one.
Figure 12
Thermister
Fuse, Melting
4. FAN AND FAN MOTOR
1) Fridge
1) Remove all of the Fridge compartment.
2) Remove one screw in Case Assembly,Control REF.
3) Pull out the Case Assembly, Control REF.
4) Disconnect the Housing of lead wire.
5) Loose five screws fixed to the Bracket.
6) Pull out Bracket and then remove the Fan Motor
Assembly.
2) Freezer
1) Remove all of the freezer compartment,
(Involved wire shelf, ice maker)
2) Remove two screws in Grille Fan.
3) Pull out the Grille Fan and Shroud F.
4) Disconnect the Housing of lead wire.
5) Remove three screws in Grille Fan.
6) Separate Shroud, F to the Grille Fan.
7) Loose three screws fixed to the Bracket.
8) Pull out Bracket and then remove the Fan Motor
Assembly.
Fan Motor Assembly can’t separate.

- 15 -
6. FRIDGE HEATER, SHEATH
In this refrigerator, Heater, Sheath is used for defrosting
heater. During heating, the temperature of heater rises
about 150~200 . Therefore, be careful not to burn while
servicing.
1) After removing the Grille and Shroud, separate the
Heater, Sheath by disconnecting the connectors.
2) Exchanged Heater, Sheath and connected the housing.
Heater, Sheath
7. FREEZER HEATER, SHEATH
In this refrigerator, Heater, Sheath is used for defrosting
heater. During heating, the temperature of heater rises
about 300~350 . Therefore, be careful not to burn while
servicing.
1) After removing the Grille and Shroud, separate the
Heater, Sheath by disconnecting the connectors.
2) Exchanged Heater, Sheath and connected the housing.
Figure 13
Heater, Sheath

- 16 -
Remove the basket over
the case pump. The dial rotated with open. Remove the water tank.
Disassemble Screw. Pull up the case pump. Pull out each other and
Disconnect the tubes.
8. CASE ASSEMBLY PUMP DISASSEMBLY
Check these when water is not supplied:
1) Check whether water is in the water tank.
2) Check whether you can hear the sound of pump working, when you push the dispenser button.
3) Check each connecting point of tubes.
(Water tank assembly, Case pump assembly)
Caution :
Do not use other beverage (milk, juice, carbonated beverage etc) than potable water.
Especially beverage including grain must not be used (may result in failure).
Notice!
Pump may cause noise while water is being dispensed. This is due to remove the water inside tube for sanitation.
When long period dose not use or the first use, you have to fill the water tank with over 1L water.

COMPRESSOR
- 17 -
1. Inverter Linear Compressor
1) Method to Measure Compressor Winding Resistance
Normal Determination Criteria.
The compressor winding resistance can be determined as normal if resistance values show the values as described in
below figure when measuring resistance values of the harness (connected with compressor) to connect.
Connect201(CON201) of the main PWB as shown in below figure.
Check for defect of the inverter linear compressor in following orders:
Defect Determination Criteria
Check connection status of the Compressor Connection Harness-P(Lead Wire) which is located at the M/C room where
resistance values measured at the CON201 Housing are shown as infinite or several hundred . Separate connecting
wires of the M/C room (A-point in Figure) and then measure resistance values at the connecting wires again. The
compressor can be determined as normal if resistance values are shown as standard resistance value. Check connection
status of a harness.
Defect at M/C room connection contact or CON201 Housing contact, short-circuit of harness)
Where resistance values measured at A-point are also shown as infinite or several hundred , disassemble a cover PTC
of the compressor terminal and check the terminal connecting status at the B-point in Figure.
Where there is no failure in the wiring status and resistance values are shown as infinite or several hundred , it may be
determined as defect of compressor.
Since if there is no failure in resistance values of the compressor, it may be defective Main PWB, replace the Main PCB
and check for normal operation of the compressor.
When determining any defect through resistance measuring, it can be determined as normal if resistance values show as
descried in the below figure by measuring power and common terminal or full power and common terminal.
However, resistance values are measured when measuring power and full but measuring is meaningless since they
cannot become criteria for determining defect (measuring not required).
Caution
1. Be sure to powering off the refrigerator and measure after several minutes has passed.
2. If not accurately measuring resistance, wrong determination may be guided. (Difference of resistance value of several W
or so may occur.)
Multi
Tester
CON201 Multi
Tester
Po : Power
Co : Common
N/C : Open terminal
Capacitor Spec.
550V, 10uF 5%
Multi
Tester
Multi
Tester
Because of ambient temperature or operating situations;
the values shown can have a slight devlation.
Earth
Hermetic terminal
Dead Short Check
Resistance
6 ~ 8
FC75LANE
OLP

- 18 -
2) Method to Determine Defect of Inverter Linear Drive
Determination of Comp Operation
Separate the back cover at the rear of refrigerator and determine for possible operation while touching the compressor with
the hands with insulation gloves worn.
Comp Operation
- Determine possible trip by checking operation status if cold air comes out after opening the doors of the R-Room.
Protective Logic (Trip)
- To protect the compressor from abnormal operation, this logic is used to temporally stop the refrigerator when abnormal
operation occurs and to re-operate it after abnormal signal disappears.
Compressor protection Logic Table
If LED of PCB is blinking, Refer to next page.
Stroke Trip
Locked Piston Trip
Current Trip
IPM Fault
App.
E-Inv.
E-Inv.
E-Inv.
E-Inv.
Requirement
Piston overruns the designed range.
Piston is locked.
Current overruns the designed range
IPM pin 14 output voltage = low
(IPM Short, High current input, or low
voltage input)
Waiting Time
1’ 00’’
2’ 30’’
6’ 00’’
20’’
The number of LED
blinking
2
5
6
7

- 19 -
3) LED blinks two times, then repeats (Stroke Trip)
Purpose: Prevent abnormally long piston strokes.
Case 1. If compressor doesn’t work and LED blinks
- Cause: Possibly harness from compressor to PCB might be defective.
Case 2. If compressor works intermittently and LED blinks
- Cause: Condenser Fan or Freezer Fan is not running. Sealed system problem such as moisture restriction, restriction at
capillary tube or refrigerant leak.
Logic: Compressor is forced to off and then tries to restart after 1 minute.
Protection
logic
Check B
Blink 2 times
(Stroke Trip)
Check B2
Compressor
Doesn t work Harness
Connecting
Check C
Cycle
Check E
Fix
Cycle
Replace
Driver PCB
Y
Y
NY
N
Repeat
Check Procedure Stroke Trip
Occur? Reset
Power Compressor
Damage
Check C
Replace
Compressor
Replace
Capacitor
Compressor
Works
Intermittently
Capacitor
Spec.
Check C
Fix Harness
Y
NN
N
Y
Y
NG
OK

- 20 -
4) LED blinks five times, then repeats (Locked Piston)
Purpose: To detect locked piston
Cause: Lack of oil to the cylinder, cylinder or piston damaged and or restricted discharge.
A Locked Piston can also be caused by foreign materials inside the compressor.
Logic: Compressor is forced off and tries to restart within 2.5 minutes.
Protection
logic
Check B
Blink 5 times
(Lock Piston Trip)
Check B3
Compressor
Doesn’t work Compressor Doesn’t work Hi side restriction
Repeat
Check Procedure
Reset
Power
Sealed
system
Repair
Replace
Compressor
N
Y
N
Y