Whirlpool UDT555SAHP Handleiding
Whirlpool
Vaatwasser
UDT555SAHP
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KD-18
18” & 24” ADA Models
Built-In Dishwashers
W11187658
SERVICE MANUAL

ii n
18” & 24” ADA Built-In Dishwashers
FORWARD
This Service Manual, "18” & 24” ADA Built-In Dishwashers” (Part No. W11187658), provides the In-Home
Service Professional with service informaon for the “18” & 24” ADA Built-In Dishwasher."
The Wiring Diagram used in this Service Manual is typical and should be used for training purposes only.
Always use the Wiring Diagram supplied with the product tech sheet when servicing the dishwasher.
For specic operang and installaon informaon on the model being serviced, refer to the “Use and Care
Guide” or “Installaon Instrucons” provided with the dishwasher.
GOALS AND OBJECTIVES
The goal of this Service Manual is to provide informaon that will enable the In-Home Service Professional
to properly diagnose malfuncons and repair the “18” & 24” ADA Built-In Dishwasher.”
The objecves of this Service Manual are to:
• Understand and follow proper safety precauons.
• Successfully troubleshoot and diagnose malfuncons.
• Successfully perform necessary repairs.
• Successfully return the dishwasher to its proper operaonal status.
WHIRLPOOL CORPORATION assumes no responsibility for any repairs made on our
products by anyone other than authorized In-Home Service Professionals.
Copyright © 2018, Whirlpool Corporaon, Benton Harbor, MI 49022

18” & 24” ADA Built-In Dishwashers n
iii
TABLE OF CONTENTS
18” & 24” ADA Built-In Dishwashers
SECTION 1 — GENERAL INFORMATION
DISHWASHER SAFETY .........................................................................................................................1-2
GENERAL INFORMATION ...................................................................................................................1-3
18” PRODUCT AND CABINET OPENING DIMENSIONS .......................................................................1-4
24” PRODUCT AND CABINET OPENING DIMENSIONS .......................................................................1-5
MODEL & SERIAL NUMBER LABEL .....................................................................................................1-6
TECH SHEET LOCATION .......................................................................................................................1-6
MODEL & SERIAL NUMBER NOMENCLATURE ...................................................................................1-7
DISHWASHER SPECIFICATIONS ..........................................................................................................1-8
SECTION 2 — DIAGNOSTICS & TROUBLESHOOTING
DIAGNOSTIC & TROUBLESHOOTING WARNINGS ..............................................................................2-2
SERVICE MODE - 24” DISHWASHER, FRONT DISPLAY ........................................................................2-3
SERVICE MODE - 18” DISHWASHER, FRONT DISPLAY ........................................................................2-4
SERVICE MODE - 18” & 24” DISHWASHER, TOP DISPLAY (PANEL READY) .........................................2-5
SERVICE ERROR CODES ......................................................................................................................2-6
TROUBLESHOOTING GUIDE ...............................................................................................................2-7
CUSTOMER TROUBLESHOOTING GUIDE ..........................................................................................2-11
SECTION 3 — TESTING
TESTING WARNINGS...........................................................................................................................3-2
WIRING DIAGRAM ..............................................................................................................................3-3
GENERAL THEORY OF OPERATION .....................................................................................................3-4
POWER CHECK ....................................................................................................................................3-4
DOOR SWITCH CIRCUIT ......................................................................................................................3-5
COMPONENT TESTING .......................................................................................................................3-6
CONTROL BOARD ...............................................................................................................................3-6
WATER INLET VALVE ...........................................................................................................................3-8
DISPENSER CIRCUIT ............................................................................................................................3-9
HEATING ELEMENT ...........................................................................................................................3-10
TURBIDITY SENSOR ..........................................................................................................................3-11
THERMISTOR ....................................................................................................................................3-12
OVERFLOW SWITCH .........................................................................................................................3-13
FLOW METER ....................................................................................................................................3-14
WASH PUMP .....................................................................................................................................3-15
DRAIN PUMP ....................................................................................................................................3-16
PRESSURE SWITCH ...........................................................................................................................3-17
NOTES ...............................................................................................................................................3-18
Connued on next page . . .

iv n
18” & 24” ADA Built-In Dishwashers
PRODUCT SPECIFICATIONS & WARRANTY INFORMATION SOURCES (inside back cover)
SECTION 4 — COMPONENT ACCESS
REMOVING THE TUB GASKET AND TRIM ..........................................................................................4-2
REMOVING THE DOOR PANEL ............................................................................................................4-3
REMOVING THE CONTROL PANEL (UI) ...............................................................................................4-4
REMOVING DOOR SWITCH ASSEMBLY ..............................................................................................4-5
REMOVING DISPENSER ASSEMBLY ....................................................................................................4-6
REPLACING THE INNER DOOR PANEL ................................................................................................4-7
REMOVING THE AIR BREAKER ASSEMBLY .........................................................................................4-8
REMOVING THE NOZZLE DUCT ..........................................................................................................4-9
REMOVING THE CONTROL BOARD ..................................................................................................4-10
REMOVING THE WATER VALVE ........................................................................................................4-11
UNDER TUB COMPONENTS ..............................................................................................................4-12
REMOVING THE PRESSURE SWITCH ................................................................................................4-13
REMOVING THE DRAIN PUMP .........................................................................................................4-14
REMOVING THE THERMISTOR & TURBIDITY SENSOR .....................................................................4-15
REMOVING THE HEATER ELEMENT ..................................................................................................4-16
REMOVING THE WASH PUMP ASSEMBLY ........................................................................................4-17
REMOVING THE SUMP ASSEMBLY ...................................................................................................4-18
NOTES ...............................................................................................................................................4-20
18” & 24” ADA Built-In Dishwashers
TABLE OF CONTENTS (CONTINUED)

1-2 n
18” & 24” ADA Built-In Dishwashers
GENERAL INFORMATION
Dishwasher Safety
You can be killed or seriously injured if you don't immediately
You can be killed or seriously injured if you don't follow
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you what can
happen if the instructions are not followed.
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety
messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol and either the word “DANGER” or “WARNING.”
These words mean:
follow instructions.
instructions.
DANGER
WARNING

1-4 n
18” & 24” ADA Built-In Dishwashers
GENERAL INFORMATION
18” Product and Cabinet Opening Dimensions
32 1/ "2
(82.5 cm) min.
35"
(88.9 cm) max
21 9/16"
(54.7 cm)
21 9/ "16
(54.7 cm)
Side View 18" Custom Wood Panel
32 1/ "2
(82.5 cm) min.
35"
(88.9 cm) max
17 5/ "8
(44.7 cm) max
Front View
NOTE: Route the water supply line and power cable through
the channels provided under the dishwasher (circled above).
32 1/2"
(82.5 cm) min.
35"
(88.9 cm) max
22 5/ "16
(56.6 cm)
22 5/ "16
(56.6 cm)
Side View 18" Metal Door Panel
18"
(45.7 cm) min.
24"
(61 cm)
min.
32 1/ "2
(82.5 cm) min.
Cutout Dimensions
Underside of countertop to oor
The enclosure must be at least 18" wide, 24" (61 cm) deep,
and 32½" (82.5 cm) high.
For the front door of the dishwasher to be ush with the
leading edge of the counter top, the counter top must be
at least 24" (61 cm) deep.
This dishwasher is designed to be enclosed on the top and
on both sides by a standard residential kitchen cabinet unit.
The installation enclosure must be clean and free of any
obstructions.
NOTE: ADA installation, 32½" (82.5 cm) beneath 34" (86.4 cm)
high countertops may be accomplished by adjusting the toekick
and leveling legs.

GENERAL INFORMATION
18” & 24” ADA Built-In Dishwashers n
1-5
24” Product and Cabinet Opening Dimensions
321/ "2
(82.5 cm) min.
35"
(88.9 cm) max
21 9/ "16
(54.7 cm)
21 9/16 "
(54.7 cm)
Side View 24" Custom Wood Panel
32 1
/ "2
(82.5 cm) min.
35"
(88.9 cm) max
23 1/ "2
(59.6 cm)
Front View
NOTE: Route the water supply line and power cable through
the channels provided under the dishwasher (circled above).
321/2"
(82.5 cm) min.
35"
(88.9 cm) max
22 5/16 "
(56.6 cm)
22 5/ "16
(
56.6 cm
)
Side View 24" Metal Door Panel
24"
(61 cm) min.
24"
(61 cm)
min.
32 1
/ "2
(82.5 cm) min.
Cutout Dimensions
Underside of countertop to oor
The enclosure must be at least 24" (61 cm) wide, 24" (61 cm)
deep, and
32½" (82.5 cm)
high.
For the front door of the dishwasher to be ush with the
leading edge of the counter top, the counter top must be
at least 24" (61 cm) deep.
This dishwasher is designed to be enclosed on the top and
on both sides by a standard residential kitchen cabinet unit.
The installation enclosure must be clean and free of any
obstructions.
NOTE: ADA installation, 32½" (82.5 cm) beneath 34" (86.4 cm)
high countertops may be accomplished by adjusting the toekick
and leveling legs.

1-6 n
18” & 24” ADA Built-In Dishwashers
GENERAL INFORMATION
Tech Sheet Location
Panel)
Model & Serial Number Label
Tech Sheet Location
Figure 7 - Model/Serial Number Label located inside, on left side wall, toward front.
Figure 8 - Tech Sheet located behind toe panel inside insulation folds.
Model & Serial Number
Label Location
(Rt. Side, Inner Door)

GENERAL INFORMATION
18” & 24” ADA Built-In Dishwashers n
1-7
MODEL NUMBER W D F 518 S A H W 0
INTERNATIONAL SALES OR
MARKETING CHANNEL
BRAND CLASSIFICATION
W = Whirlpool , U = Unbranded
PRODUCT IDENTIFIER
D = Dishwasher
PRODUCT TYPE
F = Front UI, T = Top UI (Panel Ready)
FEATURE SET
518 = 18” (45 cm) Model, 550 = 24” (60 cm) Model
TUB MATERIAL
S = Stainless Steal
MODEL TYPE
A = ADA
YEAR OF INTRODUCTION
H = 2018
COLOR
W = White, B = Black, S = Stainless Steel, M = Monochromatic Stainless, P = Panel Ready
ENGINEERING CHANGE
0 = Basic Release; 1 = First Revision; 2 = Second Revision
Model & Serial Number Nomenclature
SERIAL NUMBER F K 8 25 10000
PRODUCTION SITE
F = FINDLAY, OH
SOURCE PRODUCTION
K = HEFEI, CHINA
YEAR OF PRODUCTION
7 = 2017, 8 = 2018
WEEK OF PRODUCTION
PRODUCT SEQUENCE NUMBER

1-8 n
18” & 24” ADA Built-In Dishwashers
GENERAL INFORMATION
Dishwasher Specifications
Line Voltage/Frequency : 120 VAC / 60 Hz
Amps : 15 or 20 Amp
Circuit : Separate circuit with me-delay fuse or circuit breaker
Supply Water Pressure : 20 - 100 psi
Supply Water Temperature : 120° F (49° C)
Water Charge Approx. 3.8 L each ll
Dishwasher Type : Built-in
Control Type: Electronic Control/Tap Touch
Control Locaon : Front (Top-Panel Ready)
Dispensers : Detergent and Rinse Aid
Wash Levels : 4
Decibel Level : 50 dBA (18”), 51 dBA (24”)
Cycles : 18” - (5) Heavy, Light/China, Normal, Quick Wash, Rinse Only
24” - (6) Glass, Heavy, Light/China, Normal, Quick Wash, Rinse Only
Drying System : Recessed Heang Element
Tub Material : Stainless Steel
Rack Material : Nylon
Wash System : Filter (Removable)
Racks : 2
Lower Spray Arm Rotaon : 20 - 40 rpm
Upper Spray Arm Rotaon : 15 - 40 rpm
ADA Compliant : Yes
Energy Star Qualied : Yes
Kosher Consumer Friendly : Yes
CEE Tier : Tier 1
18” Dishwasher
Depth : 22” (55.88 cm) without handles, 22 7/16” (57 cm) with handles
Height : 34 1/2” (87.63 cm) max., 32 1/2 (82.55 cm) min.
Width : 17 5/8” (44.70 cm)
Weight : 75 lbs (34kg)
24” Dishwasher
Depth : 24” (60.96 cm) without handles, 24 7/16” (62.10 cm) with handles
Height : 34 1/2” (87.63 cm) max., 32 1/2 (82.55 cm) min.
Width : 23 1/2” (59.69 cm)
Weight : 105 lbs (47.63kg)

DIAGNOSTICS & TROUBLESHOOTING
18” & 24” ADA Built-In Dishwashers n
2-1
Section 2:
Diagnostics &
Troubleshooting
This secon provides diagnosc, fault codes, and
troubleshoong informaon for the 18” & 24” ADA Built-In
Dishwashers.
n Diagnoscs & Troubleshoong Safety
n Service Mode - 24” Dishwasher, Front Display
n Service Mode - 18” Dishwasher, Front Display
n Service Mode - 18” & 24” Dishwasher, Top Display
n Service Error Codes
n Troubleshoong Guide
n Customer Troubleshoong Guide

2-2 n
18” & 24” ADA Built-In Dishwashers
DIAGNOSTICS & TROUBLESHOOTING
For Service Technician Use Only
Voltage Measurement Safety Information
When performing live voltage measurements, you must do the following:
n Verify the controls are in the off position so that the appliance does not start when energized.
n Allow enough space to perform the voltage measurements without obstructions.
n Keep other people a safe distance away from the appliance to prevent potential injury.
n Always use the proper testing equipment.
n After voltage measurements, always disconnect power before servicing.
IMPORTANT: Electrostatic Discharge (ESD) Sensitive Electronics
ESD problems are present everywhere. Most people begin to feel an ESD discharge at approximately
3000V. It takes as little as 10V to destroy, damage, or weaken the main control assembly. The new
main control assembly may appear to work well after repair is nished, but a malfunction may occur
at a later date due to ESD stress.
n Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted
metal in the appliance
-OR-
n Touch your nger repeatedly to a green ground connection point or unpainted metal in the
appliance.
n Before removing the part from its package, touch the anti-static bag to a green ground
connection point or unpainted metal in the appliance.
n Avoid touching electronic parts or terminal contacts; handle electronic control assembly by
edges only.
n When repackaging main control assembly in anti-static bag, observe above instructions.
IMPORTANT SAFETY NOTICE — “For Technicians only”
This service data sheet is intended for use by persons having electrical, electronic, and mechanical
experience and knowledge at a level generally considered acceptable in the appliance repair trade.
Any attempt to repair a major appliance may result in personal injury and property damage. The
manufacturer or seller cannot be responsible, nor assume any liability for injury or damage of any
kind arising from the use of this data sheet.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.

2-4 n
18” & 24” ADA Built-In Dishwashers
DIAGNOSTICS & TROUBLESHOOTING
For Service Technician Use Only
To Enter Service Mode—18” Dishwasher, Front Display
Figure 1 - 18” Dishwasher, Front Display
1. Turn the dishwasher o and make sure no LED’s are lit.
2. Disconnect power to the dishwasher.
3. Reapply power with the door open and quickly press and hold both the Cycles Start/Cancel and buons within 60 seconds
from connecng power. Close the door and then the dishwasher will run as below.
Service Mode Chart
NO. COMPONENT SSD* NOTE
1 WATER VALVE 05
TURBIDITY
VALUE
TURN ON WATER VALVE. THE FLOW METER WILL ALLOW 3 L OF WATER
TO ENTER THE DISHWASHER. (THIS STEP WILL DISPLAY THE TURBIDITY
VALUE ON THE SSD.)
2 WASH PUMP
HEATER
04 TURN ON THE WASH PUMP. AFTER 10 SECONDS THE HEATER WILL TURN
ON. THE BEEPER WILL SOUND WHEN THE TEMPERATURE HAS RISEN 3 - 5
DEGREES. THE DISHWASHER WILL STOP WHEN THE TEMPERATURE HAS
REACHED 57°C. PRESS START TO ENTER THE NEXT STEP.
3 HIGH WASH PUMP
DISPENSER
03 TURN ON THE WASH PUMP FOR 8 SECONDS AFTER 2 SECOND DELAY.
THEN TURN ON THE DISPENSER FOR 45 SECONDS.
4 PAUSE 02 PAUSE FOR 30 SECONDS.
5 DRAIN PUMP 01 TURN ON THE DRAIN PUMP FOR 30 SECONDS.
6 END BOARD TYPE
CODE
BEEP ONE TIME. (THE SSD WILL SHOW THE BOARD TYPE CODE.)
*SSD = Seven Segment Display
To Exit Service Mode:
Disconnect power to the dishwasher.

DIAGNOSTICS & TROUBLESHOOTING
18” & 24” ADA Built-In Dishwashers n
2-5
For Service Technician Use Only
To Enter Service Mode—18” & 24” Dishwasher, Top Display (Panel Ready)
Figure 2 - 18” Dishwasher, Top Display
1. Turn the dishwasher o and make sure no LED’s are lit.
2. Disconnect power to the dishwasher.
3. Reapply power with the door open and quickly press and hold both the and Rinse Start buons within 60 seconds from
connecng power. Close the door and then the dishwasher will run as below.
Service Mode Chart
NO. COMPONENT SSD* NOTE
1 WATER VALVE 05
TURBIDITY
VALUE
TURN ON WATER VALVE. THE FLOW METER WILL ALLOW 3 L OF WATER
TO ENTER THE DISHWASHER. (THIS STEP WILL DISPLAY THE TURBIDITY
VALUE ON THE SSD.)
2 WASH PUMP
HEATER
04 TURN ON THE WASH PUMP. AFTER 10 SECONDS THE HEATER WILL TURN
ON. THE BEEPER WILL SOUND WHEN THE TEMPERATURE HAS RISEN 3 -
DEGREES. THE DISHWASHER WILL STOP WHEN THE TEMPERATURE HAS
REACHED 57°C. PRESS START TO ENTER THE NEXT STEP.
3 HIGH WASH PUMP
DISPENSER
03 TURN ON THE WASH PUMP FOR 8 SECONDS AFTER 2 SECOND DELAY.
THEN TURN ON THE DISPENSER FOR 45 SECONDS.
4 PAUSE 02 PAUSE FOR 30 SECONDS.
5 DRAIN PUMP 01 TURN ON THE DRAIN PUMP FOR 30 SECONDS.
6 END BOARD TYPE
CODE
BEEP ONE TIME. (THE SSD WILL SHOW THE BOARD TYPE CODE.)
*SSD = Seven Segment Display
To Exit Service Mode:
Disconnect power to the dishwasher.
Figure 1 - 24” Dishwasher, Top Display

2-6 n
18” & 24” ADA Built-In Dishwashers
DIAGNOSTICS & TROUBLESHOOTING
For Service Technician Use Only
Service Error Codes
ERROR
CODE
SSD*
ERROR
CODE
NON-SSD*
ERROR CAUSES WHAT TO CHECK
E1 “QUICK”
INDICATOR
FLASHES
WATER INLET
FAILURE
DURING THE WATER INLET
STEP, IF THE FLOW METER
CAN’T DETECT A CORRECT
FILL AFTER 4 MINUTES, E1
WILL BE DISPLAYED.
1. CHECK THE WATER SUPPLY.
2. CHECK THE INLET VALVE.
3. CHECK THE INLET.
4. CHECK THE FLOW METER.
5. CHECK THE PRESSURE SWITCH.
6. CHECK THE DRAIN.
7. CHECK THE CONTROL.
E3 “QUICK”
& “GLASS”
INDICTORS
FLASH
HEATER FAILURE WHEN THE TEMPERATURE
DOESN’T REACH THE
CORRECT VALUE AFTER
90 MINUTES, WILL BE E3
DISPLAYED.
1. CHECK THE HEATER.
2. CHECK THE THERMISTOR.
3. CHECK THE CONTROL.
E4 “LIGHT”
INDICATOR
FLASHES
OVERFLOW IF WATER FLOWS INTO THE
BASE AND ACTIVATES THE
OVERFLOW SWITCH, THE
DISHWASHER WILL DISPLAY
E4.
1. CHECK THE USE OF THE DETERGENT.
2. CHECK WHETHER THE APPLIANCE IS LEVEL.
3. CHECK THE OVERFLOW SWITCH.
4. CHECK THE DRAIN PUMP.
5. CHECK THE AMOUNT OF WATER IN SUMP.
6. LOCATE LEAK AND REPAIR.
E6 “LIGHT” &
“GLASS”
INDICATORS
FLASH
NTC OPEN CIRCUIT
FAILURE
TEMPERATURE SENSOR
OPEN CIRCUIT, WILL BE E6
DISPLAYED.
1. CHECK THE INLET WATER TEMPERATURE.
2. CHECK THE THERMISTOR.
3. CHECK THE CONTROL.
E7 “LIGHT,
GLASS, &
QUICK”
INDICATORS
FLASH
NTC SHORT
CIRCUIT FAILURE
TEMPERATURE SENSOR
SHORT CIRCUIT, WILL BE E7
DISPLAYED.
1. CHECK THE INLET WATER TEMPERATURE.
2. CHECK THE THERMISTOR.
3. CHECK THE CONTROL.
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
Failure Soluons:
1. If an alarm occurs, the machine will enter a failure solving process: The buzzer sounds once per second for 30 seconds. The
error code will be displayed. During that me, the drain pump will turn on for 2 minutes.
2. During the drain, if the door is opened, the drain ming will pause.
*SSD: Seven Segment Display (Not available on 24” Front Display Dishwashers.)

DIAGNOSTICS & TROUBLESHOOTING
18” & 24” ADA Built-In Dishwashers n
2-9
Troubleshoong Guide (connued)
For Service Technician Use Only
DESCRIPTION POTENTIAL CAUSES CHECK
WASH PUMP WILL NOT
PUMP (CONTINUED)
DOOR SWITCH NOT MAKING CONTACT
CONSISTENTLY:
¾FAULTY OR SLOPPY DOOR LATCH
ASSEMBLY (WHICH CAN BE
AGGRAVATED BY HIGH DOOR CLOSURE
FORCE KEEPING STRIKE PLATE FROM
FULLY SEATING)
¾FAULTY DOOR SWITCH (HIGH RESISTANCE)
1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. MEASURE RESISTANCE OF DOOR SWITCH
CONTACTS WHILE CHECKING MECHANICAL
OPERATION OF LATCH ASSEMBLY. CONFIRM
SWITCHES NOT LOOSE FROM ASSEMBLY. CHECK
STRIKE PLATE AND DOOR CLOSURE.
FAULTY MOTOR START CAPACITOR 1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. DISCONNECT CAPACITOR LEADS AND CONFIRM
CAPACITANCE IS AS LABELED ON PART OR CHECK
RESISTANCE FOR OPEN CIRCUIT ACROSS THE
TERMINALS. REPLACE IF OPEN.
EXCESSIVE SUDS IN PUMP DUE TO USING
WRONG OR TOO MUCH DETERGENT OR
RINSE AID
1. INSTRUCT CUSTOMER; REFER TO USE AND CARE
MANUAL.
2. REPEATEDLY FILL AND CANCEL/DRAIN TO
REMOVE SUDS.
3. CHECK DISPENSER IN DIAGNOSTICS AND RINSE
AID SETTING.
FAULTY WASH PUMP DRIVE CIRCUIT ON
THE CONTROL
CHECK OPERATION OF WASH PUMP MOTOR DURING
DIAGNOSTICS.
WILL NOT DRAIN OR
EXCESS WATER LEFT IN
UNIT
OBSTRUCTED DRAIN HOSE OR PATH 1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. CHECK FOR BLOCKAGES FROM SUMP CHECK VALVE
TO CUSTOMER’S PLUMBING POTENTIAL ITEMS:
• PLUGGED GARBAGE DISPOSER OR PLUG NOT
KNOCKED OUT
• BLOCKED/STUCK SUMP OR DRAIN LOOP CHECK
VALVE
• PLUGGED HOSES
OPEN WINDING ON DRAIN PUMP MOTOR
OR LOOSE/OPEN CONNECTION IN DRAIN
MOTOR CIRCUIT.
1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. CHECK THE RESISTANCES OF DRAIN MOTOR
WINDINGS AND ALL CONNECTIONS IN DRAIN
CIRCUIT.
DRAIN PUMP IMPELLER FRACTURED 1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. REMOVE DRAIN PUMP AND CHECK IMPELLER BY
PULLING AND ROTATING. iF THE IMPELLER PULLS
OFF EASILY OR TURNS FREELY (NORMALLY THERE
IS SOME UNEVEN RESISTANCE). IF STRIPPED -
REPLACE.
DIAMETER OF DRAIN HOSE TOO SMALL CHECK/INSTALL PROPER DRAIN HOSE.
DRAIN LOOP CHECK VALVE NOT SEALING
AND CUSTOMER DISPOSER/WASTE LINE
PARTIALLY OR FULLY PLUGGED.
1. DISCONNECT DRAIN HOSE AT PLUMBING
CONNECTION.
2. ELEVATE HOSE ABOVE DISHWASHER AND
FILL WITH WATER IF WATER FLOWS INTO
DISHWASHER, REPLACE ENTIRE DRAIN LOOP
(INSTALL AS HIGH AS POSSIBLE AND ATTACH TO
UNDERSIDE OF COUNTER TOP IF POSSIBLE).
FAULTY DRAIN MOTOR DRIVE CIRCUIT ON
CONTROL
CHECK OPERATION OF DRAIN MOTOR DURING
DIAGNOSTICS.

3-4 n
18” & 24” ADA Built-In Dishwashers
TESTING
For Service Technician Use Only
General Theory of Operaon
Refer to Wiring Diagram on page 3-3.
Neutral and L1 (AC voltage) enters the Control Board at
CON1, pins 1 & 2 respecvely. AC is converted to DC voltage
at the Low Volts Power Supply (LVPS). Supplies include +12
and +5 VDC, and DC GND (REF). These low voltage supplies
are used to provide power to the microprocessors and board
components, power the sensors and energize the AC relays.
The 12 VDC is vital to the operaon of the dishwasher.
This supply is necessary to operate all 120 VAC loads in
the dishwasher, whether they are connected to a relay or
controlled by TRIACs. 12 VDC is generated by the power supply
and ows through the door switch—when closed—to be
available to the heater relay, wash motor relays, and the drain
pump relay. A relay coil becomes energized when the control
closes the LV drive circuit for a specic relay compleng 12V
pathway, which in turn closes the relay switch providing AC to
the load.
Power Check
This test checks for incoming and outgoing power to and from
the control board. This test assumes that proper voltages is
present at the outlet or direct connect cable.
Test Procedure
1. Unplug dishwasher or disconnect power.
2. Remove access panel.
3. Remove terminal box cover.
4. With a voltmeter set to AC, insert black probe inside white
wire screw nut (N) and insert red probe inside black wire
screw nut (L1).
5. Plug in dishwasher or reconnect power.
¾If 120 VAC is present, unplug dishwasher or disconnect
power and proceed to step 6.
¾If 120 VAC is not present, have customer correct power
problem at outlet or breaker.
6. Remove the control board cover.
7. Locate connector CON 1.
8. With a voltmeter set to AC, connect leads across the two
pins (“N” and “L”) on CON 1.
9. Plug in dishwasher or reconnect power.
¾If 120 VAC is present, go to step 10.
¾If 120 VAC is not present, check for open connecon
between terminal block and control. Repair as needed.
10. Verify DC Supplies
• 5 VDC is used to power IC’s and micro-processors on the
circuit board as well as provide power to the sensors.
¾If were missing, the control and Turbidity Sensor 5 VDC
would not funcon. To verify 5V ± 5%, with a voltmeter
set to DC, connect the black lead to CN4-2 (DC GND)
and the red lead to CN3-1 (+5V).
• 12 VDC is used to actuate the heater, drain and wash pump
relays as well as the dispenser and water inlet valve.
¾If was missing, the heater, pumps, and all other 12 VDC
loads would not turn on. To verify 12V ± 5%, with a
voltmeter set to DC, connect the red lead to CN6-1
(12V) and black lead to CN4-2 (DC GND).
Troubleshoong Missing DC Supplies: Refer to the
wiring diagram on page 3-4 when troubleshoong the
DC supplies. If 5 VDC or 12 VDC is missing on the control,
unplug dishwasher or disconnect power, and then
disconnect all components/loads from the control relying
on the missing or loaded supply. Plug in dishwasher or
reconnect power and check if the DC supply has returned.
¾If not, replace the control.
¾If it has, turn o dishwasher and reconnect one
connector at a me unl the component loading down
that supply has been idened.
11. Unplug dishwasher or disconnect power.
12. Reassemble all parts and panels.
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.

TESTING
18” & 24” ADA Built-In Dishwashers n
3-7
For Service Technician Use Only
CONTROL BOARD - CONNECTOR LOCATIONS
CON 1
L1 & N
! A
CONTROL BOARD - CONNECTOR IDENTIFICATION
CON1: L1, N
• N - Neutral In
• L - Line 1 In
CON2: Drain & Wash Pump
• Pin1 - Drain Pump (Pressure Sw.)
• Pin2 - Wash Pump - High speed
• Pin3 - Wash Pump - Low speed
• Pin4 - Not used
• Pin5 - Not used
PO1/PO2: Heater
CN1: Not used
CN2: User Interface
CN3: Turbidity Sensor
CN4: Flow Meter/Thermistor/Rinse Aid Detector/Overow Sw.
CN5: Water Inlet Valve
CN6: Dispenser and Door Switch
CN7: Not used
CN8: Not used
CON 2
Drain Pump
Wash Pump
PO1/PO2
Heater
CN1
Not Used
CN2
User Interface
CN5
Water
Inlet Valve
CN6
Dispenser
Door Sw.
CN3
Turbidity Sen.
CN4
Flow Meter
Thermistor
Rinse Aid Det.
Overow Sw.
CN8
Not Used
CN7
Not Used
Product specificaties
Merk: | Whirlpool |
Categorie: | Vaatwasser |
Model: | UDT555SAHP |
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