LG WM3677HW Owner's Manual
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LG WM3677HW Owner's Manual

LG WM3677HW Owner's Manual

Washer/dryer combo
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See also: Service Manual , Training Manual
COMBO T
RAINING
Washer/Dryer Combo
WM3677HW
WM3677HW

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Summary of Contents for LG WM3677HW

  • Page 1 COMBO T RAINING Washer/Dryer Combo WM3677HW WM3677HW...
  • Page 2 The advantages are that no exhaust vent is required and most ventilation restrictions do not apply to the combo. There is lower heat, resulting in less damage to clothing. The disadvantage is that the drying cycle takes longer than a conventional dryer. WM3677HW...
  • Page 3 Drain pump is activated every 30 seconds to remove water. Three thermistors control the water valve and Sensor DRY. It uses water to remove moisture. Drying time is extra long. - 120 VAC WM3677HW...

  • Page 4: Dry Cycle

    Water COOLS the return duct causing moisture in the air to condense Drain Pump is energized every 30 seconds, approx. 10 seconds, pumping approx. 4 oz. of water Estimating a 3 hour drying cycle = 8 oz. every minute = 10 gallons of water WM3677HW...
  • Page 5 The most recent version of this presentation and its accompanying manual will be available on LG CS Academy. In providing this training to our servicers, we assume they are reasonably trained and experienced in the repair of electronics and appliances, and accept no liability for injury or accident during the course of the repair.
  • Page 6 • Before attempting an installation or any service procedure, read and be very familiar with the COMBO’s service manual. • Do not install or store the COMBO in a location where it is exposed to the weather. WM3677HW...
  • Page 7 These can emit explosive vapors or react chemically to cause a fire. • Never add flammable substances to the COMBO. These substances can emit explosive vapors, even in the lower heat that a combo produces. WM3677HW...
  • Page 8 • DO NOT ground to a gas pipe. • Before attempting an installation or any service procedure, read and be very familiar with the combo’s service manual. • DO NOT install or store the combo in a location where it is exposed to the weather. WM3677HW...
  • Page 9 Also, remove and destroy the unit’s power cord. • At any time that the COMBO is opened for service, the servicer should take the opportunity to make sure that the inside of the cabinet is free of dust and lint. WM3677HW...
  • Page 10 Hydrogen is explosive. Before servicing in such a situation, allow the hot water source(s) to run for several minutes to release any accumulated hydrogen. Do not smoke or use an open flame while doing this! WM3677HW...
  • Page 11 • Turn the power OFF before servicing the COMBO. • Use a helper to lift or move the COMBO. It weighs nearly 200 pounds. • Follow ESD guidelines for handling parts and servicing. • Do not remove the ground pin from the plug. WM3677HW...
  • Page 12 Introduction Combo Specs COMBO WM3677HW, WM3677HB White, Black Color The 2005 line-up of LG Wash Capacity 3.22 ft3 (3.72 ft IEC) washers and dryers Max. 11 lbs. (8 kg) Dry Capacity includes the COMBO. Power Supply 120 VAC, 60 Hz, 5 Amps...

  • Page 13: Serial Numbers

    Serial Numbers WM3677HW...
  • Page 14 Features • DIRECT DRIVE MOTOR • TILTED DRUM and LARGE DOOR • WATER CIRCULATION • ROLLER JETS • AUTOMATIC LOAD DETECTION • BUILT-IN HEATER • CHILD LOCK WM3677HW...

  • Page 15: Fuzzy Logic

    Fuzzy Logic To get the best washing performance, optimal cycle time is determined by comparing the selected water temperature, sensing the current water temperature, and the amount of laundry. WM3677HW...
  • Page 16 DOOR LOCKED LAMP The DOOR LOCK lamp lights: * When the COMBO is operating * When the water level sensor frequency is lower than 22.9 kHz * When the temperature inside the tub is over 45 ° C (113 ° F) WM3677HW...
  • Page 17 This spray not only keeps the window and gasket clean, it allows the clothes to be soaked with detergent more quickly and can be used to control an oversudsing event. WM3677HW...
  • Page 18 Parts Identification WM3677HW...

  • Page 19: Inlet Valves

    Main PCB Inlet Valves Water Level Switch Mushroom Valves WM3677HW...
  • Page 21 Heating Element Housing & Blower Assembly Element, Safetystat, Fuselink WM3677HW...
  • Page 22 RD&YL YL & BL BL & BL Heating Element Fuse link Safety Stat WM3677HW...
  • Page 23 WM3677HW...
  • Page 25 Thermistor Air Inlet to Tub (Temperature Control) WM3677HW...
  • Page 27 Blower Assembly Part# 4681ER1004A Left Hand Threads WM3677HW...
  • Page 28 DC Brushless -3 Pole Motor 12 VDC – 5 Wire Monitor (8 wires) WM3677HW...
  • Page 29 Blower & Heater Duct Assembly WM3677HW...
  • Page 30 Water Inlet Upper Thermistor...
  • Page 31 • Water inlet valve is energized approx. 80% of the time during the DRY cycle • The Drain Pump is energized every 30 seconds for approx. 2-3 seconds pumping approx. 4 oz. (8 oz. every minute) • Water is used to cool duct and remove lint WM3677HW...
  • Page 32 Heating Element 5301FR1158J 120 VAC WM3677HW...
  • Page 33 Inlet Valve Assemblies 5220FR2006H-HOT 5220FR2008E-COLD...
  • Page 34 Inlet Valve Layout Inlet Valve Assemblies 5220FR2006H-HOT 5220FR2008E-COLD Main Wash Bleach Dryer Prewash...
  • Page 35 Ball Sensor BL-RD 5VDC Constant Part # 4811ER3001A BL-YL 5VDC Ball NORMAL BL-YL 0VDC Ball off seat DIODE (emitting light) light BALL CASE HOLE TR (Sensing light) WM3677HW...
  • Page 36 BALL SENSOR is located Bottom Rear of Cabinet Note: Only in circuit First few minutes of spin Ball Sensor Tab Tub Tab WM3677HW...
  • Page 37 CASE moved temporarily from its resting place, allowing the light HOLE to trigger the phototransistor. This, in turn, causes the drum TR (Sensing light) rotation to stop and then attempt to rebalance the load. WM3677HW...

  • Page 38: Parts Identification

    Parts Identification Back of COMBO ACCESSORIES WM3677HW...

  • Page 39: Shipping Bolts

    Shipping Bolts Remove the shipping bolts AFTER the COMBO has been carried to the installation area. Save the bolts in case the COMBO must be moved. (relocation, service, etc.) Use the provided wrench to remove bolts and level the feet. WM3677HW...

  • Page 40: Installation

    Installation Install the COMBO on a firm, flat surface. Adjust the feet to level the COMBO. WM3677HW...
  • Page 41 Installation Connect the water hoses and the drain hose. Watch the stripes on the hoses (red for hot, blue for cold). It is critical to proper washing function. Secure the drain hose in the pipe of sink. WM3677HW...

  • Page 42: Control Panel

    Control Panel WM3677HW...
  • Page 43 Program Chart (Washing) WM3677HW...
  • Page 44 The dispenser works by using various solenoids to apply water to different Siphon Box compartments. The Siphon Box holds the liquid product until it is flooded. Then it dispenses the laundry additive into the stream filling the tub. WM3677HW p16~17...
  • Page 45 Note the main and pre-wash hoses enter at an angle. Operating them simultaneously causes water to dispense the softener. Water may also pass through the wash compartments, but since the detergent has already been dispensed, it doesn’t matter. WM3677HW...

  • Page 46: Test Mode

    The COMBO must be empty and off to enter TEST MODE. 1. Press and hold SPIN SPEED and SOIL LEVEL. 2. Press POWER. 3. Press START/PAUSE to cycle through the test modes. (See chart on next slide.) Check the water level frequency. (Only by Test Mode) WM3677HW...
  • Page 47 Test Mode WM3677HW...
  • Page 48 Use this flow chart to test the COMBO after installation and after any repair or adjustment. WM3677HW...

  • Page 49: Error Codes

    In the case of any other error code, if the error is not resolved within 4 minutes, the COMBO will power OFF. • In the case of FE, the COMBO will not power off. error code charts on subsequent slides WM3677HW...
  • Page 50 Error Codes WM3677HW...
  • Page 51 Error Codes WM3677HW...

  • Page 52: Diagnosis And Check List

    Diagnosis and Check List The following slides will aid in diagnosing and repairing COMBOs. diagnostic charts on subsequent slides WM3677HW...
  • Page 53 Diagnosis and Check List Sometimes the customer will make a note of an error code to aid in diagnosing the problem. Follow the troubleshooting tree for a quick and easy diagnosis. WM3677HW...
  • Page 54 Diagnosis and Check List WM3677HW...
  • Page 55 Diagnosis and Check List WM3677HW...
  • Page 56 Diagnosis and Check List WM3677HW...
  • Page 57 Diagnosis and Check List WM3677HW...
  • Page 58 Diagnosis and Check List WM3677HW...
  • Page 59 Diagnosis and Check List If one of these codes shows up, it means a definite service call. WM3677HW...
  • Page 60 Diagnosis – No Power continued on next slide WM3677HW...
  • Page 61 Diagnosis – No Power continued from previous slide WM3677HW...
  • Page 62 Diagnosis – Vibration and Spin Noise continued on next slide WM3677HW...
  • Page 63 Diagnosis – Vibration and Spin Noise If still unstable, adjust the feet to level the COMBO. WM3677HW...
  • Page 64 Diagnosis – No Water Supply WM3677HW...
  • Page 65 Diagnosis – Detergent Does Not Dispense WM3677HW...
  • Page 66 Diagnosis – Other Products Do Not Dispense WM3677HW...
  • Page 67 Diagnosis – Abnormal Sound or Noise WM3677HW...
  • Page 68 Diagnosis – Heating w/out Water WM3677HW...
  • Page 69 Diagnosis – Drain Malfunction WM3677HW...
  • Page 70 Diagnosis – Wash Heater Malfunction WM3677HW...
  • Page 71 Diagnosis – Overheating Water WM3677HW...
  • Page 72 Diagnosis – No Circulation continued on next slide WM3677HW...
  • Page 73 Diagnosis – No Circulation WM3677HW...
  • Page 74 Diagnosis – Spin Malfunction WM3677HW...
  • Page 75 Diagnosis – dE Error Code WM3677HW...
  • Page 76 Diagnosis – dHE Error Code WM3677HW...
  • Page 77 Diagnosis – Dryer Fan Malfunction WM3677HW...
  • Page 78 Diagnosis – Dryer Heater Malfunction WM3677HW...
  • Page 79 Some components may have up to 300 volts present. • Drain the water from the COMBO if necessary to avoid spillage during a repair. Use a shallow pan and the drain hose on the front of the machine. • Observe ESD precautions when handling electronic components. WM3677HW...
  • Page 80 Slide the top plate backward and lift it, as shown. Disconnect the Display PWB connectors. (3 connectors) Remove the dispenser drawer. Remove the two screws behind the dispenser drawer. Lift off the left side of the Control Panel and pull it out. WM3677HW...
  • Page 81 Repair – Control Panel Remove the nine screws that secure the PWB. Remove the PWB. Reassembly is the reverse of these steps. WM3677HW...
  • Page 82 SENSOR SWITCH assembly. Remove the protective cover by lifting the plastic clips around the top and sides. 2. Disconnect all the connectors. Note that they are all different shapes and colors to prevent any mistakes upon replacement. WM3677HW...
  • Page 83 Repair – Main PWB Remove the screw on the back. Remove the MAIN PWB from the COMBO. (Slide it to the right and then lift.) Reassembly is the reverse of these steps. WM3677HW...
  • Page 84 1. Remove the top plate. 2. Remove the dispenser. 3. Remove the two screws from the front of the dispenser. 4. Remove the clamp and the large hose on the back of the dispenser. 5. Leave the small feed hoses on the dispenser. WM3677HW...
  • Page 85 Valve Assembly Wire/Connector Chart (Conn) (Wire) BLUE Yellow and Black (dryer water – cold) WHITE White and Black (main wash – cold) BLUE Gray and Black (pre-wash – cold) Blue and Black (hot input) WHITE Orange and Black (bleach – cold) WM3677HW...
  • Page 86 Remove the screw and ring connector for the ground. Replace the screw and any wires other than the ground for the noise filter. Remove the screw securing the noise filter to the frame of the COMBO. Replacement is the reverse of these steps. WM3677HW...
  • Page 87 Remove the four screws from the top edge of the front cabinet cover. Remove the screw behind the filter cover. Use a putty knife or a screwdriver on both sides (one at a time) of the filter cover and pull it out. WM3677HW...
  • Page 88 Repair – Front Cabinet Cover Remove the screw that was hidden by the filter cover. Open the COMBO door. Use the special gasket pliers (part # 383EER4001A) to remove the gasket clamp/spring assembly. WM3677HW...
  • Page 89 Repair – Front Cabinet Cover Tilt out the cabinet cover. Disconnect the door switch connector. (Don’t forget it when you put the cover back on!) Lift the cabinet cover (front) off and set it aside where it will not fall or be damaged. WM3677HW...
  • Page 90 Repair – Front Cabinet Cover Remove the gasket clamp on the tub side. Remove the gasket. WM3677HW...
  • Page 91 Put a flat screwdriver into the hinge opening and gently pry off the hinge cover. Remove the screw from the lower hinge pin. Lift the door off the hinge. BE CAREFUL! The door is heavy! WM3677HW...
  • Page 92 Repair – Door Lock Switch Assembly Open the door. Using the special pliers, remove the gasket clamp. Remove the screws. Pull the switch out and disconnect the wiring harness. NOTE! Be sure you reconnect the wires when you replace the switch. WM3677HW...
  • Page 93 Unlike a more traditional brushless motor, the Direct Drive’s rotor surrounds the stator rather than being attached to it. A Hall sensor reports the motor’s speed to the MICOM. (see chart, next slide) WM3677HW...
  • Page 94 Repair – Motor WM3677HW...
  • Page 95 The motor controller can determine the direction and speed of rotation by adjusting the polarity and amplitude of the power applied to the stator. (see picture, next slide) WM3677HW...
  • Page 96 Otherwise, the drum may move forward far enough to make it difficult to replace the bolt. The helper can also keep the drum from turning while you torque the bolt. WM3677HW...
  • Page 97 Repair – Motor CONNECTOR HALL EFFECT SENSOR Check here before disassembling the motor. WM3677HW...
  • Page 98 Pull the rotor off the shaft. (You may have to wiggle it off. The shaft is splined.) 4. Remove the two screws from the tub bracket. 5. Remove the six bolts on the stator. 10mm 6. Remove the two electrical connectors on the stator. WM3677HW...
  • Page 99 Using a 5/8 deep well socket makes this easier by holding down the locking tab so the pin slides out easily. ) Replace the damper with a new part. Do not reuse a damper that has been disassembled. WM3677HW...
  • Page 100 If you remove the counterweights, the motor will make the tub vary back-heavy. It should probably be removed with the weights. Otherwise, leave them both in place unless you must disassemble the tub. Regardless, most of this procedure will require a helper. WM3677HW...
  • Page 101 Disconnect the wire lead to the thermistor. Disconnect the wires on the heating element. Remove the center bolt securing the ground and the element. Pull the element out carefully. WM3677HW...
  • Page 102 Extreme torque is not required when replacing the bolt; instead use a drop of Loctite®. (M10-1.50X75 Long Bolt) Use extreme caution! This part holds the motor’s permanent magnets. WM3677HW...
  • Page 103 3. Disconnect the electrical connections and grounding screw. 4. Remove the 6 bolts that hold the windings in place. 5. Disconnect the small hose that attaches to the water level sensor. 6. Disconnect the dryer duct water input hose. WM3677HW...
  • Page 104 8. Disconnect the recirculating hose at the top of the door gasket. 9. Disconnect the air vent hose. Be especially careful of the ball check valve. It must be replaced correctly to function properly. 10. Disconnect the vacuum break. WM3677HW...
  • Page 105 Repair – Tub Removal and Repair 11. Remove the clamp where the dryer duct connects to the gasket. Separate the gasket and duct for when the tub comes out. This will allow the dryer assembly to remain in place when the drum comes out. WM3677HW...
  • Page 106 It is easiest to remove the bottom pin first. After removing the drum, the pin on the other end is easy to reach if it must be removed at all. WM3677HW...
  • Page 107 Repair – Tub Removal and Repair Open the spring clip on each side where the spring supports the tub. Lift the springs out of the holders and take the tub out through the front of the COMBO. (This may require a helper!) WM3677HW...
  • Page 108 (The bearing is visible in this photo.) Do not disturb the seal (gasket) between the tub Cavities in tub molding can halves unless it requires build up detergent residue replacement. Odors from excessive soap WM3677HW...
  • Page 109 Repair – Tub Removal and Repair Remove two bolts from the end on the spider of the drum. Then remove the screw on the outside of the drum. Squeeze the sides of the baffle slightly to release the positioning tabs. WM3677HW...
  • Page 110 The roller balls help turn the clothes over and the baffle fills up with water as the drum rotates, allowing it to shower that water out as it continues to rotate. As always, reassembly is basically the reverse of these steps. WM3677HW...
  • Page 111 10 to obtain the frequency reading in kHz. A display of 254 would indicate a frequency of 25.4 kHz. The MICOM interprets the frequency reading as one of eight levels, with one being the lowest water level and any level greater than eight indicating an overflow situation. WM3677HW...
  • Page 112 Repair – Water Level Switch WM3677HW...
  • Page 113 The filter are between the pumps is not a lint filter in the traditional since. It serves to trap larger objects (keys, coins, buttons, etc.) that may find their way into the washer and protects the pumps from physical damage. see diagram, next page WM3677HW...
  • Page 114 Remove the pump hose, the bellows, and the circulation hose from the pump body. Remove the two screws on the front plate. Push the pump backward and lift it out. You can replace either pump without affecting the other one. (See drawing.) WM3677HW...
  • Page 115 Repair – Water Heater Remove the front cover. Separate the connectors from the heater element. Remove the nut (also the ground connection) and pull the heater out. WM3677HW...
  • Page 116 Repair – Thermistor Remove the front cover. Disconnect the thermistor at the white connector. Pull the thermistor out by the bracket. WM3677HW...
  • Page 117 Repair – Removal of Foreign Objects Remove the front cover. Remove the heater from the tub. Use a long bar or a wire to fish out anything that could be in the space there. WM3677HW...
  • Page 118 CASE moved temporarily from its resting place, allowing the light HOLE to trigger the phototransistor. This, in turn, causes the drum TR (Sensing light) rotation to stop and then attempt to rebalance the load. WM3677HW...
  • Page 119 However, if the load is out of balance and the tub moves too far out of place, a tab on the tub will strike the ball sensor. WM3677HW...
  • Page 120 Repair – Ball Sensor (Unbalance) Remove the four screws and the back cover. Remove the single screw that secures the sensor (bottom right as you face the back of the COMBO.) Separate the connector. WM3677HW...

  • Page 121: Dryer Repair

    Because the air is recycled instead of exhausted, a vent and lint filter are not necessary for this type dryer. NOTE: The Cooling Water rinses any Lint from the DUCT Lint may accumulate in the Hose between the DUCT and PUMP WM3677HW...
  • Page 122 4. Lift the dryer fan housing and duct from the back end to clear the cabinet. The studs will pull free and you can remove the heater assembly. WM3677HW...
  • Page 123 If you haven’t drained the water from the tub, this would be a good time to do it. 6. Disconnect the condenser boot on the tub end. (This will aid disassembly and reassembly because it is easier to reach.) WM3677HW...
  • Page 124 Dryer Repair 7. Release the clamp and remove the dryer water supply hose at the solenoid end. WM3677HW...
  • Page 125 Then insert the hose and rotate it 90 ° to lock it into place. 9. Dryer reassembly is the reverse of these steps. Test and diagnostic procedures are available on pages 33~34 (slides 55~57) the training manual. WM3677HW...

  • Page 126: Main Board

    It is not possible to cross the connectors. They are identifiable by pin count, conductor count, and shape, as shown on the diagram. Two of the less common color abbreviations on the diagram are SB (Sky Blue) and NA (Natural, which is cream or white.) WM3677HW...
  • Page 127 Main Board WM3677HW...

  • Page 128: Wiring Diagram

    Wiring Diagram WM3677HW...

  • Page 129: Exploded View

    Exploded View CABINET and CONTROLS WM3677HW...
  • Page 130 Exploded View DRUM and RELATED PARTS WM3677HW...
  • Page 131 Exploded View DISPENSER WM3677HW...
  • Page 132 Exploded View DRYER COMPONENTS WM3677HW...

  • Page 133: Parts List

    Full Parts List is in the SERVICE MANUAL and the TRAINING MANUAL Loc # Part No Description M120 5209ER0002B DUCTASSEMBLY M121 5200ER3001A PIPE M130 5214ER4001C HOSE, INLET M210 6931FR3108A THERMOSTAT ASSEMBLY 383EER4001A GASKET PLIER (SPECIAL TOOL) (Outer) 393EER4003A DAMPER PLIER (SPECIAL TOOL) 383EER4004A GASKET PLIER (SPECIAL TOOL) (Inner) WM3677HW p63~66...

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