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SERVICE MANUAL

24" BUILT-IN DISHWASHERS
ELECTRONIC CONTROL

PRECISION WASH SYSTEM

5995293536

Summary of Contents for ADW750EA

Page 1: ...SERVICE MANUAL 24 BUILT INDISHWASHERS ELECTRONICCONTROL PRECISIONWASHSYSTEM 5995293536 ...

Page 2: ... Lower Vent Housing 10 Vent Valve 10 Vent Actuator 10 Blower 10 Upper Vent Housing 10 Dispensing System 11 Detergent Rinse Aid Dispenser 11 Door Latch Assembly 11 Electronic Control and Thermistor 11 No Heat Dry 12 Temp Assure 12 Heat Delay 12 High Limit Thermostat 12 Dishwasher Leveling System 12 Temperature Controls With Thermister 13 Cycles 13 Options 13 Dirt Sensor 13 Rinse Aid Dispenser 14 Bo...

Page 3: ...acket 19 Water Valve 19 Drain Pump 19 Lower Spray Arm 20 Glass Trap 20 Lower Spray Arm Support 20 Filter 20 Pump Cover 20 Pump and Motor Assembly 20 Motor Mounting Bracket 21 Motor and Impeller 21 Thermistor 21 High Limit Thermostat 21 Indicator Lamps 21 TROUBLESHOOTING 22 Troubleshooting Tips 22 Troubleshooting Diagnostics 24 APPENDIX A Exploded Views A 1 APPENDIX B Wiring Diagrams Timer Charts F...

Page 4: ...ve the fuse Turn off the gas supply Turn off the water supply 3 Never interfere with the proper operation of any safety device 4 USE ONLY REPLACEMENT PARTS CATALOGED FOR THIS APPLIANCE SUBSTITUTIONS MAY DEFEAT COMPLIANCE WITH SAFETY STANDARDS SET FOR HOME APPLIANCES 5 GROUNDING The standard color coding for safety ground wires is GREEN or GREEN with YELLOW STRIPES Ground leads are not to be used a...

Page 5: ...both products PTC HEATING ELEMENT This element is self regulating to provide lower wattages during the dry cycle than in the wash cycle when it is used to boost the water temperature VENT VALVE Closed during water recirculation cycles for quiet operation but opens during dry cycle to allow moist air to escape TEMP ASSURE AND HEAT DELAY THERMISTOR A single thermistor located beneath the sump raises...

Page 6: ...Motor RPM Amps Thermal Cutout Temp 3200 ccw 3 4 150 C PTC Heating Element During Wash Cycle During Dry Cycle 900 Watts 700 Watts High Limit Thermostat opens at 200 F Temp Assure All cycles except China Crystal 136 F Water Temp Temp Assure China Crystal Cycle 127 F Water Temp Hi Temp Wash 143 F Water Temp Hi Temp Rinse 145 F Water Temp Color Code DIAGRAM INDEX MODEL NUMBER CYCLE CHART WIRING DIAGRA...

Page 7: ...cur near the end of the 3rd wash cycle High Temp Rinse causes a potential delay near the end of the 2nd Rinse cycle Hi Temp Rinse is not used in the China Crystal cycle WASH CYCLE RINSE CYCLE OPTIONS SELECTED Temp Assure 1st potential Delay Heat Delay 2nd potential delay Temp Assure 3rd potential Delay Heat Delay 4thd potential delay High Temp Wash OFF High Temp Rinse OFF 136 F Bypassed 136 F Bypa...

Page 8: ...iltered water to the pump for recirculation through the spray arms The other called a quiet water cavity allows soil to collect in the area of the macerator blade where it is held until the drain pump removes it WATER DISTRIBUTION COMPONENTS Wash Pump The recirculation wash pump has three 3 functional parts a 1 12th HP drive motor impeller and macerator blade The pump circulates water at the rate ...

Page 9: ...Page 8 Different Types of Precision Wash Motors ASKO Motor Phase III ASKO Motor Phase II Emerson Motor with Phase Mounting Bracket Emerson Motor with Aluminum Motor Mount ...

Page 10: ...sh andanouterfilterof stainless steel Drain Pump The drain pump has only one function to remove water from the dishwasher The drain pump is driven by a 1 25th HP drive motor It consists of three 3 functional parts a pump cover impeller and armature and stator The quiet cavity and impeller cavity are connected by a hose underneath the sump This connection between the two cavities allows both caviti...

Page 11: ...attached to one end of the rod and the slide is inserted in the other The spring pushes in on the slide forcing the rod to push the valve against the opening in the door panel When the timer enters the dry cycle 120 VAC is applied tothewaxmotor Thewaxmotorismadeupofaheating disk fluid chamber and piston When voltage is applied to the heating disk it heats the fluid in the chamber causing the fluid...

Page 12: ...st time to release the detergent cup cover the pin moves up but does not raise the rinse injector pump arm When the timer removes power from the actuator the spring forces the rinse injector pump arm end of the pivot arm down The compound slot in the rinse injector pump arm directs the pivot arm pin down the front of the rinse injector pump arm and under a shorter slot in the center of the arm Whe...

Page 13: ...nd of the second rinse cycle When the thermistor senses that the water is cooler than 140 F it will stat in this no more than 10 minutes then the control will advance on into the cycle whether or not it reached 140 F This is designed to keep the dishwasher from running for too long of a period trying to raise thewater temperature Heat Delay HeatDelay isanoptionalfunctionthatmustbeselected by the c...

Page 14: ...mum delay time is 10 minutes per delay HI TEMPRINSE Selectsonlytherinsetemperature delay which is 145 F The maximum delay time is 10 minutes for this delay SANI RINSE Selects both the wash temperature delay which is 145 F and the rinse temperature delay which is 150 F At the end of the HI TEMP RINSE an additional 10 minutes of rinsing time is added to ensure sanitation The heater will be cycled on...

Page 15: ... going to the small circuit board and use a jumper wire to jump from one wire to the other Then turn the power supply back on PF should start flashing in the display window Now latch the door and the flashing PF should go out This is called the Idle Mode To go into the Service Test Mode simultaneously press the HI TEMP WASH START CANCEL pads for 1 5 to 2 seconds It should display a 07 in the Displ...

Page 16: ...Page 15 Thermistor Bottom View Hi Limit Thermostat Drain Pump Motor ...

Page 17: ...rd 4 Disconnect keypad ribbons from control board 5 Remove cycle selector knob from face of control panel See Selector Switch 6 Peal overlay and keypad away from front of control panel 7 When replacing keypad use denatured alcohol to get old glue residue off of control panel face 8 Remove protective paper from back of new keypad exposing side with glue 9 Line up new keypad to corners of control pa...

Page 18: ...sh plastic bracket open and rotate bottom of switch up DETERGENT RINSE AID DISPENSER 1 Disconnect dishwasher from electrical supply 2 Remove outer door panel 3 Disconnect wiring connections 4 Remove six Phillips screws and carefully push dispenser into tub INNER DOOR PANEL 1 To replace inner door panel remove control panel door vent dispenser and latch 2 Remove two bolts T 25 TORX from each hinge ...

Page 19: ...er distributor is screwed to top of upper arm delivery tube A rubber seal is used on top side of tub to eliminate leaks KICK PLATE 1 To remove kick plate and insulation some models remove two Phillips screws and pull out on bottom of kick plate HEATING ELEMENT 1 Disconnect dishwasher from electrical supply 2 To remove element disconnect wiring and remove two element mounting nuts 3 Lift terminal e...

Page 20: ...l kick plate and wires 3 The water valve is secured with two 5 16 hex screws DRAIN PUMP 1 Disconnect dishwasher from electrical supply 2 Remove outer door panel and kick plate 3 Remove hoses and wiring to drain pump 4 Remove two screws securing drain pump to mounting bracket 5 The drain pump assembly consists of three primary parts 1 stator winding 2 motor armature impeller and 3 front housing To ...

Page 21: ...UMP COVER 1 To remove pump cover remove glass trap spray arm spray arm support and filter 2 Remove three T 20 TORX screws and lift cover off PUMP AND MOTOR ASSEMBLY 1 To remove pump and motor assembly discon nect dishwasher from electrical supply Remove glass trap spray arm spray arm support and filter 2 Remove door panel and kick plate 3 Disconnect upper spray arm hose drain hose and motor wiring...

Page 22: ...access to thermistor remove outer door panel and kick plate 3 Disconnect wires from thermistor and remove single Phillips screw and retainer Note When removing or replacing the thermistor make sure to apply more thermal mastic to the face of the thermistor HIGH LIMIT THERMOSTAT ON TUB BOTTOM 1 Disconnect dishwasher from electrical supply 2 To gain access to thermostat remove outer door panel and k...

Page 23: ... open 2 Heater element open 3 Electronic control board defective 4 Wiring or terminal defective 1 Excess detergent on lid catch 2 Latch mechanism defective 3 Electronic control board defective 4 Wiring or terminal defective 5 Broken spring s 6 Defective actuator 1 Replace fuse or reset breaker 2 Repair or replace wire fasteners at dishwasher junction box 3 Replace control board 4 Check replace tra...

Page 24: ...wed to stand too long in dispenser 2 Dispenser wet when detergent was added 3 Detergent cover held closed or blocked by large dishes 4 Improper incoming water temperature to properly dissolve detergent 5 See Detergent Cover Will Not Open 1 Clear restrictions 2 Replace pump 3 Drain hose must slope upward to side of tub Hose must be attached on side of tub 4 Check for blockage and clear 5 Replace wi...

Page 25: ... of the Control Panel Will Not Program 30 Dishwasher is Completely Inoperative 31 Display Will Not Illuminate 33 Dishwasher Operates in Normal Wash No Matter What Cycle is Selected Selectronic Models Only 34 Dishwasher Overfills 36 Dishwasher Will Not Fill 38 Dishwasher Will Not Drain 40 Dishwasher Detergent Dispenser Will Not Open 42 Dishes are Not Dry 43 Wash Pump Motor Does Not Run 45 ...

Page 26: ...20 psi Increase water pressure Low Water Level Possible component failure 1 Low water pressure 2 Dirty inlet valve screen Low Water Level Check water pressure to dishwasher Clean water inlet valve screen Above 20 psi ...

Page 27: ... operating in short wash measure the voltage across the thermistor Remove electrical power measure the resistance of the thermistor Ask the customer to use Hi Temp Wash Above 120 F Yes Raise water temperature to dishwasher Below 120 F No Shorted or open Zero Go to flow chart Dishes Are Not Dry Defective control board Defective thermistor 5 VDC 10000 Ohms ...

Page 28: ...lure 1 Door seal 2 Door latch 3 Door hinge Note There are no adjustments to the door or latch Door Leaks Remove the door panel drop the control panel and inspect the door latch door strike and door hinge If they look good replace the door seal ...

Page 29: ...es Are Not Clean Possible component failure 1 Low water level see flow chart Low Water Level 2 Spray arms not alternating Run diagnostic test 3 Low water temperature 4 Blocked spray arm 5 Bad detergent 6 Hard water ...

Page 30: ...sible component failure 1 Vent valve 2 Vent mechanism Steam Comes From the Vent During Wash Cycle Open the control panel and remove the vent mechanism Is the valve in place on the actuator arm Replace the vent mechanism Yes Snap the valve back into place No ...

Page 31: ...ouch pad Some Functions of the Control Panel Will Not Program Remove the touch pad ribbon from the board clean the ribbon tail reinstall the ribbon Check the dishwasher operation If the control panel does not program replace the touch pad If the control panel still will not program replace the control board ...

Page 32: ...ishwasher is Completely Inoperative Possible component failure 1 Power to the dishwasher 2 Transformer 3 Control board 4 Touch pad 5 Line side door switch 6 Wiring between these components P8 P1 3 P1 4 P10 P3 5 ...

Page 33: ...rop across the thermistor Check power to dishwasher Zero Defective transformer Zero 5 VDC Measure the voltage drop between terminals PS04 2 PS04 1 of the control board Measure the voltage drop between terminals PT01 PS04 10 of the control board Zero 12 VAC Zero Defective control board Open wiring between the transformer board Zero 12 VAC Remove the touch pad ribbon from the board clean the ribbon ...

Page 34: ...ot Illuminate Possible component failure 1 Control Board 2 Display Display Will Not Illuminate Measure the voltage between the two outside pins of the display plug 5 VDC Defective Display Zero Defective control board P8 P3 5 ...

Page 35: ...Page 34 Dishwasher Operates in Normal Wash No Matter What Cycle is Selected Selectronic models only Possible component failure 1 Control board 2 Cycle selector control P8 P10 P3 5 ...

Page 36: ...c models only Set the selector to Pots Pans Drop the control panel unplug the cycle selector control from the control board Measure the resistance between pins 1 and 3 in the plug Infinity Defective cycle selector control 47 000 Ohms Measure the resistance between the black lead and center lead for each setting Defective control board Infinity Defective cycle selector control ...

Page 37: ...Page 36 Dishwasher Overfills Possible component failure 1 Control board 2 Inlet valve 3 Blocked drain hose 4 Pinched crossover hose 5 Defective drain pump FLOAT SWITCH WATER VALVE 699 OHMS ...

Page 38: ...let valve No Cancel and restart a normal wash program Does the water pump out all but a small amount in the bottom of the pump cavity Allow the dishwasher to advance to a fill Does the dishwasher over fill Yes Yes Defective control board Refer to Dishwasher Will Not Drain flow chart Refer to Dishwasher Will Not Drain flow chart No No ...

Page 39: ...Page 38 Dishwasher Will Not Fill Possible component failure 1 Water supply 2 Control board 3 Float switch 4 Inlet valve FLOAT SWITCH WATER VALVE 699 OHMS ...

Page 40: ...nel and kick plate Run the diagnostic test for a fill and with a voltmeter measure the voltage drop between each terminal of the float switch and neutral 120 VAC on one terminal 0 volts on the other Defective float switch Defective timer 0 Volts on both terminals Defective inlet valve 120 VAC on both terminals ...

Page 41: ...Page 40 Dishwasher Will Not Drain Possible component failure 1 Control board 2 Drain pump 3 Drain pump stator winding 4 Crossover hose 5 Restricted drain hose P6 DRAIN MOTOR 28 OHMS ...

Page 42: ...late Remove electrical power and disconnect the two wires from the drain pump Apply electrical power run the diagnostic test for drain and measure the voltage drop between the two wires Defective control board or broken wire 0 Volts Remove electrical power Remove the stator winding from the drain pump motor and check it with an ohmmeter 120 VAC Open Defective stator winding Blocked pump Around 30 ...

Page 43: ...1 Control board 2 Dispenser Detergent Dispenser Does Not Open Remove the door panel Run the diagnostic test for dispenser Measure the voltage drop across the terminals of the dispenser actuator 0 VAC Defective control board or broken wire 120 VAC Defective dispenser P3 2 ...

Page 44: ...Page 43 Dishes Are Not Dry Possible component failure 1 Heater 2 Hi limit thermostat 3 Control board 4 Vent mechanism 5 Blower 6 Hot or cool dry switch 8 P5 P10 P3 2 ...

Page 45: ... Check the voltage drop between terminal PT02 on the control board and neutral 0 Volts Defective control board Yes Is the vent valve open Open the control panel Check the voltage drop between the terminals of the vent actuator No 120 Volts Defective vent actuator 0 Volts Defective control board or broken wire Yes Is the blower running Yes Check water temperature Defective blower motor No Defective...

Page 46: ...Page 45 Wash Pump Motor Does Not Run Possible component failure 1 Control board 2 Wash pump motor P7 PUMP MOTOR 4 9 OHMS ...

Page 47: ...ash motor Run the diagnostic test for the wash motor and measure the voltage drop between the blue and white wires Remove filter and pump cover Check for something blocking or holding the impeller or macerator blade 0 Volts Defective control board or broken wire Blocked Remove blockage Clear Defective motor 120 VAC ...

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Page 63: ...APPENDIX B SERVICE DATA SHEETS MODEL SERVICE DATA SHEET PAGE GLDB957JB 154371501 B 1 GLDB958JB 154371501 B 1 GPDB988JC 154371501 B 1 ADW750EA 154390601 B 2 ADW850EA 154390601 B 2 ...

Page 64: ...MS W HI LIMIT THERMOSTAT TURBIDITY SENSOR R P5 WATER VALVE 699 OHMS FLOAT SWITCH PK P3 3 W Y Y P1 4 P1 3 RINSE AID LEVEL SENSE BK BK P4 2 P4 1 P7 P10 P3 5 DOOR SWITCH W NEUT W L1 BK BK BK P1 1 P8 R P2 1 W P2 2 BK P2 3 W OUTPUTS TURBIDITY SENSE DISPENSERS HEATER DRAIN MOTOR DRY SYSTEM PUMP MOTOR WATER VALVE SERVICE DATA SHEET P N 154371501 Electronic Series LVSOD RGHV 5HDGRXW LO PF HO CL 01 09 Low ...

Page 65: ...any kind arising from the use of this Service Data Sheet Operation LO PF HO CL 01 09 Low liquid in the rinse aid dispenser A power failure has occurred Water heating delay Close and latch the door Hour s delay before start PUMP MOTOR 4 3 OHMS THERMISTOR 10000 OHMS 25 C DRAIN MOTOR 28 OHMS VIO 120VAC 60HZ MEMBRANE SWITCH ELECTRONIC CONTROL BOARD SOME MODELS P6 P9 BU W DISPENSER 1928 OHMS R Y W P3 1...

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