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GE GDWT668V Technical Service Manual

Top-control stainless steel tub dishwashers
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GE Appliances
Technical Service Guide
September 2011
Top-Control Stainless
Steel Tub Dishwashers
GDWT668V
GDWT768V
PDWT180V
PDWT380V
PDWT560V
PDWT565V
CDWT280V
CDWT980V
ZBD6920V
ZBD7920V
ZBD8920V
31-9221
GE Appliances
General Electric Company
Louisville, Kentucky 40225

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  Summary of Contents for GE GDWT668V

  • Page 1 GE Appliances Technical Service Guide September 2011 Top-Control Stainless Steel Tub Dishwashers GDWT668V GDWT768V PDWT180V PDWT380V PDWT560V PDWT565V CDWT280V CDWT980V ZBD6920V ZBD7920V ZBD8920V 31-9221 GE Appliances General Electric Company Louisville, Kentucky 40225...
  • Page 2 GE Appliances Copyright © 2011 All rights reserved. This service guide may not be reproduced in whole or in part in any form without written permission from the General Electric Company.
  • Page 3: Table Of Contents

    Table of Contents Active Vent ...................................26 Bottom Door Seal................................27 Center Wash Arm ................................28 Coarse Filter ..................................30 Component Locator Views ............................13 Control Board ..................................22 Control Board Connector Locator View .........................16 Control Features ................................7 Control Thermal Cutout (TCO)............................22 Consumer Purge of the Bulk Dispenser Tank ......................21 Cycle Chart ..................................12 Cycles .....................................11 Detergent/Rinse Module ..............................24...
  • Page 4 SmartDispense ................................18 Sump Filter ...................................29 Tactile Switch ..................................23 Troubleshooting ................................37 Tub Gasket ...................................27 Tub Thermal Cutout (TCO) .............................36 Turbidity Sensor ................................31 Upper Wash Arm ................................28 Vent Fan ....................................25 Warranty ....................................41 Water Hardness Test and Calibration ........................17 Water Inlet Valve ................................33 –...
  • Page 5: Nomenclature

    Nomenclature Model Number G D W T 6 6 8 V B B Product Type GDW = GE Long Door Exterior Color PDW = Profi le BB = Black CDW = GE Café CC = Bisque SS = Stainless Steel...
  • Page 6: Introduction

    Introduction New Features and Benefi ts • Five-stage fi ltration with Piranha™ hard food disposer • Dedicated silverware jets • Steam PreWash • Fan assist dry with heated option and ActiveVent • Fifty-two dBA sound level • ENERGY STAR® qualifi ed and CEE Tier II rated •...
  • Page 7: Control Features

    Control Features Throughout this manual, features and appearance may vary from your model. Top-Control Dishwashers Control Settings Status Indicator Lights (Indicators vary by models) The Status display tells you what is happening while the dishwasher is in operation and may flash, indicating a malfunction.
  • Page 8 (Continued next page) – 8 –...
  • Page 9 The STEAM option will use the heater to increase the temperature of the water. The circulation pump will turn off periodicall , allowing water to drip onto the hot calrod which will create steam. (Continued next page) – 9 –...
  • Page 10 Start – 10 –...
  • Page 11: Cycles

    Cycles Auto Hot Start: Auto Hot Start is initiated by the control board when it senses water temperature is below 80°F. If the water is below 80°F after prewash, the unit circulates for 1 to 5 minutes (depending on the cycle selected) and then drains for 75 seconds.
  • Page 12: Cycle Chart

    Cycle Chart – 12 –...
  • Page 13: Component Locator Views

    Component Locator Views Front View Control Panel Insulation Door Panel Access Panel Control Panel View Door Latch Control Assembly (Continued next page) – 13 –...
  • Page 14 Interior View (Without Racks) Detergent/Rinse Module Vent Detergent/Rinse Module Compartment View Rinse Agent Outlet Indicator Window Detergent Compartment Rinse Agent Cap Compartment Lid (Continued next page) – 14 –...
  • Page 15 Interior View of Basin (With Racks Removed) Left Side View (Insulation Removed) Spray Arm Coarse Filter Float Dome Heating Element Fill Hose Hub Nut Fill Funnel Fine Filter Door Spring Bottom View (Looking Up) Front Overfi ll Switch Tub TCO Water Valve Motor Pump Assembly Turbidity Sensor...
  • Page 16: Control Board Connector Locator View

    Control Board Connector Locator View J1 - Power Supply J5 - Active Vent J2 - Power Switching J7 - Keypad J3 - Turbidity/Temperature Sensor – 16 –...
  • Page 17: Dishwasher Components

    Dishwasher Components Outer Door Panel 3. Remove the single Phillips-head screw from the control cover. The outer door panel must be removed to access the control board, detergent/rinse module, control TCO, tactile switch, door switch, vent, and lens. To remove the outer door panel: 1.
  • Page 18: Smartdispense Tm

    1. Press the SELECT CYCLE and DELAY HRS Prior to its fi rst use, the dishwasher must be buttons simultaneously and hold for 3 seconds. calibrated for water hardness. This process requires the use of a water hardness test strip (Part # 2.
  • Page 19 Position the door at a 30- to 45-degree angle. Fill Detergent Level Sensor the reservoir with a liquid automatic dishwasher The SmartDispense detergent level sensor consists detergent until the detergent reaches the threads of a single-level detection continuity sensor and of the reservoir access.
  • Page 20 The routing of the DC wiring from the tank is very The dispenser pump operates on 120 VAC. During important. The 3 tape points on the tank keep the each prewash cycle, the pump is energized for 5 DC wiring perpendicular to the AC harness wiring seconds, dispensing 4 ml of detergent.
  • Page 21: Consumer Purge Of The Bulk Dispenser Tank

    To remove the positive displacement pump: A chemical reaction also takes place between the chlorine detergent and the enzyme detergent, 1. Remove the outer door panel. (See Outer Door which causes the two liquids to coagulate and Panel build up around the detergent level sensor. This buildup may prohibit the sensor from sending the 2.
  • Page 22: Control Board

    10. Repeat steps 1 thru 9 one time. Control Board 11. Repeat steps 1 thru 6. When the CLEAN LED The control board is attached to the right side of the illuminates, the system is purged and ready to inner door panel. be refi...
  • Page 23: Lens

    4. Disengage the control board tabs from the inner Lens door panel. The lens is located behind the console and attached to the front panel with double-back tope. A new lens comes with the console as a kit. To remove the lens: 1.
  • Page 24: Detergent/Rinse Module

    3. Disconnect the 2 wires from the door switch. Door Handle The door handle is held in place by 2 screws that can be accessed by removing the console. To remove the door handle: 1. Remove the console. (See , steps 1-3.) Lens 2.
  • Page 25: Vent Fan

    The detergent/rinse mod ule au to mat i cal ly Vent Fan dis pens es both de ter gent and rinse agent at the ap pro pri ate times. The module is activated twice The vent fan runs at the end of the dry cycle, during a wash cycle.
  • Page 26: Active Vent

    4. Remove the 4 Phillips-head screws from the 3. Remove the single Phillips-head screw from the back of the vent fan. vent switch housing. 5. Remove the 2 Phillips-head screws from the bottom of the vent fan. Inner Door Panel To remove the inner door panel: 1.
  • Page 27: Bottom Door Seal

    3. Disconnect the 2 detergent/rinse module wires Bottom Door Seal and the vent fan wiring harness. The bottom door seal is riveted to the inner door panel. To remove the bottom door seal, replace the inner door panel. (See Inner Door Panel.) Disconnect Disconnect Tub Gasket...
  • Page 28: Center Wash Arm

    Center Wash Arm Lower Wash Arm To remove the center wash arm: The lower wash arm can be accessed by opening the dishwasher door and removing the bottom rack. 1. Disengage the left upper rack slide by pressing Remove the lower wash arm by pulling it up while the lever down while pulling the rack out.
  • Page 29: Fine Filter

    4. Pull the 2 clip hinges (1 on each side) outward to Fine Filter release the conduit tabs. To remove the fi ne fi lter: 1. Remove the lower wash arm. (See Lower Wash Arm.) 2. Rotate the hub nut counterclockwise. Lift the hub nut off the fi...
  • Page 30: Coarse Filter

    7. Release the 2 sump fi lter tabs with a fl at blade Coarse Filter screwdriver or putty knife. To remove the coarse fi lter: 1. Remove the sump fi lter. (See Sump Filter.) 2. Turn the wash arm hub counterclockwise and remove it from the tub.
  • Page 31: Float Switch

    Turbidity Sensor Float Switch The fl oat switch activates if water reaches the The turbidity sensor measures the amount of fl oat stem inside the dishwasher. The switch only suspended particles in the wash water in the sump. The sump water lays within the 1/4- to 3/8-in. gap terminates the voltage to the water valve.
  • Page 32: Heating Element

    To remove the turbidity sensor: To remove the heating element: 1. Remove the dishwasher from its installation. 1. Remove the dishwasher from its installation. 2. Lay the dishwasher on its back. 2. Lay the dishwasher on its back. 3. Disconnect the wire harness from the turbidity 3.
  • Page 33: Fill Funnel

    Caution: To prevent water leakage, assure the Fill Funnel O-ring is in place before installing the fi ll funnel. The fi ll funnel is mounted on the left side of the tub. Its purpose is to provide a method for supplying water for the wash and rinse cycles.
  • Page 34 2. Disconnect the overfi ll switch wiring harness. 6. Remove the clamp and outlet hose from the valve. Clamp Disconnect Hose 3. Remove the two 5/16-in. hex-head screws from the water inlet valve bracket. 4. Slide the bracket down to disengage the tab 7.
  • Page 35: Drain Pump Assembly

    Drain Pump Assembly Motor Pump Assembly The drain pump assembly is located under the tub The motor pump assembly is located under the and operates on 120 VAC. It is energized for the fi rst tub behind the sump. The motor utilizes a start capacitor rated at 10 fd.
  • Page 36: Tub Thermal Cutout (Tco)

    6. Disengage the motor hanger arm to remove the 4. Slide the tub TCO off the bracket. motor pump assembly. Tub TCO Note: When replacing the tub TCO, splice a new thermostat into the harness using connectors and procedures approved for damp/wet conditions. Silicone Grease Tub Thermal Cutout (TCO) The tub TCO trips at 165°F and it auto resets at...
  • Page 37: Service Mode

    Troubleshooting Service Mode The dishwasher is programmed with a service mode to aid the technician in troubleshooting it. Each component can be cycled to detect if it is functioning correctly. Components are cycled by pressing buttons on the control panel. To enter the service mode: •...
  • Page 38 Top-Control Activates/Deactivates fan (Hold both buttons simultaneously for 3 seconds) – 38 –...
  • Page 39: Factory Test Mode

    Factory Test Mode The factory test mode initiates automatically upon installation of a new main control board. Factory test mode (approximately 5 minutes total): • All LEDs light (10 seconds). • Close door. • Vent opens, fan activates for 5 seconds, and vent closes (15 seconds). •...
  • Page 40: Schematics And Wiring Diagrams

    Schematics and Wiring Diagrams WARNING: Disconnect electrical power before servicing. Caution: Label all wires prior to disconnection. Wiring errors can cause improper and dangerous operation. Verify operation after servicing. – 40 –...
  • Page 41: Warranty

    This warranty is extended to the original purchaser and any succeeding owner for products purchased for home use within the USA. If the product is located in an area where service by a GE Authorized Servicer is not available, you may be responsible for a trip charge or you may be required to bring the product to an Authorized GE Service location for service.