Dacor Built-In Dishwasher Service Manual
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Dacor Built-In Dishwasher Service Manual

Dacor Built-In Dishwasher Service Manual

Built-in dishwasher
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Summary of Contents for Dacor Built-In Dishwasher

  • Page 1 Service Manual Built-In Dishwasher...

  • Page 2: Table Of Contents

    able of onTenTs Section 1 - Safe Servicing Practices Door Spring .................4-7 ......Hinge “C” Arm ..............4-7 Section 2 - Operation ...........2-1 Door Seal Retainer..............4-8 Static Fill ................2-1 Pressure Switch Assembly ..........4-8 Dynamic Fill .................2-1 Thermistor/Soil Sensor ............4-9 Wash System ...............2-2 Inline Heater ...............4-9 Soil Sensing ................2-2 Drain Pump ................4-10...

  • Page 3: Section 1 - Safe Servicing Practices

    This service manual is intended for use by persons having electrical and mechanical training and a level of knowledge of these subjects generally considered acceptable in the appliance repair trade. Dacor cannot be responsible, nor assume any liability, for injury or damage of any kind arising from the use of this manual.

  • Page 4: Section 2 - Operation

    Section 2 - Operation In order to address service issues with the Dacor Built-In Dishwasher, the primary elements of its operation are described below, as well as its physical components. Static Fill The cycle begins by activating the drain pump, ensuring the sump is empty. Operation then proceeds to the fill stage where the fill valve regulates inlet water to 1.08 GPM between 20 and 120 psi.

  • Page 5: Wash System

    2 - o eCTion PeraTion Wash System Once filling is complete, the dishwasher enters the pre-wash phase. The pre-wash phase conditions the soil with water and detergent to prepare it for removal “Y” Hose in the main wash phase. Sump Once water enters the tub, the pump draws the water Inline Heater into the sump through a primary filter at the bottom...

  • Page 6: Main Wash/Temp Assure

    aCor uilT ishwasher erviCe anual Main Wash/Temp Assure After the final reading by the soil sensor, the unit drains before starting to fill for the main wash. The tub fills, with the wash motor starting after the low level pressure switch is activated. The detergent dispenser now opens, introducing detergent into the wash cycle.

  • Page 7: Rinse Phases

    2 - o eCTion PeraTion Rinse Phases The first rinse phase follows the pre-wash portion of a wash cycle. During this rinse phase, the motor ramps up by 100RPM/second to full speed (2800RPM). Once at full speed, however, the motor will cycle between 1600RPM and 2800 RPM throughout the rest of this rinse phase.

  • Page 8: Section 3 - Cycle, Systems & Components

    aCor uilT ishwasher erviCe anual Section 3 - Cycle, Systems & Components Knowledge of the dishwasher’s cycles and systems is necessary in diagnosing any potential operational problems. Methods for diagnosing these problems, such as taking resistance readings and testing for closed circuits are outlined in the following section as well. Dishwasher Control All of the functions and operations of this dishwasher are dictated and monitored by the electronic control.

  • Page 9: Entering The Water/Service Test

    3 - C & C eCTion yCle ysTeMs oMPonenTs Component Function Test (continued) Entering the Water/Service Test From Power Failure While the control displays power failure or flashing lights, press and hold the Short wash and the Rinse & Hold pads simultaneously for one second. The dishwasher will start through the test cycle. From Idle With no cycle selected and the dishwasher sitting idle, press and hold the Hi-temp and the Start pads simultaneously for one second.

  • Page 10: Soil Sensor Test Mode

    aCor uilT ishwasher erviCe anual Component Function Test (continued) Soil Sensor Test Mode This tests the sensor for proper operation as well as the value that the sensor is detecting. To activate the test you must press and hold the Heavy and Start pads simultaneously. When the test mode is activated, the digit display will show the turbidity value of the sensor.

  • Page 11: To Check Inlet Water Valve

    3 - C & C eCTion yCle ysTeMs oMPonenTs Inlet Water Valve (continued) To Check Inlet Water Valve Disconnect dishwasher from power supply. To access electrical connections to valve, remove lower front panel. Using ohmmeter, check between P3-5 (yellow wire) and P3-8 (white wire).

  • Page 12: Checking Low Water Level Switch

    aCor uilT ishwasher erviCe anual Low Water Level Switch (continued) Checking Low Water Level Switch Disconnect power to dishwasher. Gain access to electronic control and check between P3-9 (orange wire) and P3-8 (white wire). This should be an open contact. These wires are connected to center terminal #1 and terminal to the right of center #3.

  • Page 13: Checking High Water Level Switch

    3 - C & C eCTion yCle ysTeMs oMPonenTs High Water Level Switch (continued) Checking High Water Level Switch Checking continuity through the high water level switch is easier at the control. Disconnect power to dishwasher. Gain access to electronic control and check for continuity between the L1 black wire and P3-6 (brown wire).

  • Page 14: Heater

    aCor uilT ishwasher erviCe anual Heater The heater in this dishwasher is inline between the wash motor and the delivery tube. The 1200W heater wraps around a stainless steel core tube. The heater can only be energized, during a wash cycle, while the wash pump is running after the low level pressure switch has been activated.

  • Page 15: Checking The Soil Sensor

    3 - C & C eCTion yCle ysTeMs oMPonenTs Checking the Soil Sensor While in idle mode, simultaneously press and hold Heavy Wash and Start/Cancel buttons. • This activates the sensor value test. • If a number does not display, continue with the test. Disconnect dishwasher from power supply.

  • Page 16: Dispenser

    aCor uilT ishwasher erviCe anual Dispenser The dispenser consists of two dispensers in one housing, controlled by the use of one wax motor actuator. The first time the actuator is energized in the cycle, detergent is dispensed. The second time the actuator is energized, rinse agent is dispensed.

  • Page 17: Fan Dry Unit

    3 - C & C eCTion yCle ysTeMs oMPonenTs Fan Dry Unit Dishes are dried with a fan driven condensate system. This system is made up of (refer to Figures 20, 21): Fan Dry Motor Air Intake Condensate Duct Condensate Vent As the dishwasher completes its final drain, the fan dry motor forces saturated air across cool baffles in the condensate duct, resulting in the removal of moisture from the air.

  • Page 18: Section 4 - Service & Disassembly

    aCor uilT ishwasher erviCe anual Section 4 - Service & Disassembly Safety Precautions Always turn off the electric power supply before servicing electrical components, testing with an ohmmeter, or replacing parts. Refer to Safe Servicing Procedures at the front of this manual before servicing the dishwasher.

  • Page 19: Dispenser

    4 - s & D eCTion erviCe isasseMbly Dispenser Disconnect dishwasher from power supply. Remove outer door panel (see previous section for detailed instructions). Remove six screws securing dispenser assembly to inner door panel. Retainer brackets on the top and bottom may also need to be removed.

  • Page 20: Upper Spray Arm

    aCor uilT ishwasher erviCe anual Upper Spray Arm The center of the upper spray arm is a locking mount. Turn upper spray arm and mount counterclockwise to remove. (See Figure 28) To reinstall upper spray arm, line up locking posts in center mount with locking tabs on upper spray arm support.

  • Page 21: Center Spray Arm And Upper Rack Manifold

    4 - s & D eCTion erviCe isasseMbly Center Spray Arm and Upper Rack Manifold Remove upper rack and place rack upside down on a flat surface. Place blade of a very thin putty knife between retaining ring and center spray arm. Lightly twist knife to lift arm from retaining ring.

  • Page 22: Upper Spray Arm Mount

    aCor uilT ishwasher erviCe anual Upper Spray Arm Mount Replacing upper spray arm mount requires removal of cabinet. See section on cabinet removal for detailed instructions. Set dishwasher upright and remove upper spray arm. The mount pushes into the top of the tub with a rubber grommet.

  • Page 23: Water Valve

    4 - s & D eCTion erviCe isasseMbly Water Valve Disconnect dishwasher from power supply. Turn off water supply to dishwasher. Remove kick plate and lower access panel. Removal of outer door panel may be needed to gain access to necessary parts. Remove wire connect and water supply line.

  • Page 24: Door Spring

    aCor uilT ishwasher erviCe anual Door Spring Remove dishwasher cabinet. See previous section detailed instructions. Raise spring support rod out of mounting hole of “C” arm. (See Figure 38) Reinstall door spring using reverse procedure. End of spring rod goes into hinge Spring Glide Spring Spring Rod...

  • Page 25: Door Seal Retainer

    4 - s & D eCTion erviCe isasseMbly Door Seal Retainer Remove dishwasher cabinet. See Cabinet Removal for detailed instructions. Place dishwasher in an upright position and remove door seal. See previous section for detailed directions. Remove screws (across the top and on both sides of the unit) that mount door seal retainer to tub. Make sure the retainer gasket is in place and not torn before reinstalling the retainer.

  • Page 26: Thermistor/Soil Sensor

    aCor uilT ishwasher erviCe anual Thermistor/Soil Sensor Disconnect dishwasher from power and water supplies. Remove drain line. Remove dishwasher from countertop. Lay dishwasher on its back on a protective pad. Remove wire plug from sensor by lifting lock to release plug. Push retainers away from sensor and remove sensor from sump.

  • Page 27: Drain Pump

    4 - s & D eCTion erviCe isasseMbly Drain Pump Disconnect dishwasher from power and water supplies. Remove drain line. Remove dishwasher from countertop. Lay dishwasher on its back on a protective pad. Remove wires from drain pump. Removing coupling hose with drain pump aids in pump removal from sump. The locks holding the pump to the sump are located on both ends of the sump mount.

  • Page 28: Capacitor

    aCor uilT ishwasher erviCe anual Wash Motor (continued) FROnT MOUnT – FIgURE 48 REAR MOUnT – FIgURE 49 Capacitor Disconnect dishwasher from power and water supplies. Remove drain line. Remove dishwasher from countertop. Lay dishwasher on its back on a protective pad. Capacitor is mounted to back frame of the unit using a mounting nut.

  • Page 29: Blower Assembly

    4 - s & D eCTion erviCe isasseMbly Blower Assembly Remove dishwasher cabinet. See CABINET REMOVAL for detailed instructions. Locking Tabs After cabinet is removed, set unit upright. From inside of the tub, depress retaining clips. (See Figure 54) Blower assembly is removed from top outside of tub. Remove blower from side duct and remove wires from blower motor.

  • Page 30: Side Vent And Fill Hose

    aCor uilT ishwasher erviCe anual Side Vent and Fill Hose Remove dishwasher cabinet. See CABINET REMOVAL for detailed instructions. Vent Grate With cabinet removed, set unit upright. Remove fill hose from side vent by removing hose clamp. Fill Hose Location Unscrew (counterclockwise) vent grate from left side wall inside tub.
  • Page 31 5 - T eCTion roubleshooTing SYMPTOM CHECK THE FOLLOWING REMEDY Dishwasher will 1. Fuse (blown or tripped). 1. Replace fuse or reset breaker not operate when 2. 120 VAC supply wiring 2. Repair or replace wire turned on. connection faulty. fasteners at dishwasher junction box.
  • Page 32 aCor uilT ishwasher erviCe anual SYMPTOM CHECK THE FOLLOWING REMEDY Dishwasher will not 1. Drain restricted. 1. Clear restrictions. pump out. 2. Defective drain pump. 2. Replace pump 3. Air lock in drain hose. 3. Check dishwasher installation. 4. Blocked impeller. 4.
  • Page 33 6 - P eCTion arTs reakDown DOOR AnD COnTROL PAnEL Page 6-1...
  • Page 34 MDW24 Dishwasher Component Connector Locations and Display Codes Component Name Component Connector locations Resistance (Ω) Wash Motor P3-4 & P1 Wash Motor Tachometer P3-10 & P3-11 Drain Pump P3-6 & P3-8 Inlet Valve P3-5 & P3-8 1126 Dispenser P3-2 & P3-8 1665 Thermistor P2-7 &...

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