Viking Professional VDB325 User manual

Preferred Service
SMK-0003
January, 2011
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Service
Manual
This Base Manual covers general and
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limited to the following models:
VDB325
VDB450
(From 5/26/2010)
Built-In
Dishwasher

Table of Contents
2
Description Page
Important Information ....................................................... 3
Safety Information ............................................................. 3
WARRANTY INFORMATION
Warranty Information......................................................... 4
Warranty Service Information ............................................ 5
GENERAL INFORMATION
Specifications .................................................................... 6
Dimensions........................................................................ 6
Warnings............................................................................ 8
Model–Serial Number Matrix .......................................... 10
OPERATION
Settings and Functions-325 Model .................................11
Pots/Pans....................................................................... 11
Normal Wash................................................................. 11
Light/China.................................................................... 11
Rinse/Hold..................................................................... 11
Options............................................................................ 11
155˚F (68˚C) Final Rinse ................................................. 11
Delay Start..................................................................... 11
Settings and Functions-450 Model .................................12
Wash Cycles .................................................................. 12
Pots/Pans....................................................................... 12
Normal Wash................................................................. 12
Econo Wash................................................................... 12
Light/China.................................................................... 12
Rinse/Hold..................................................................... 12
Options............................................................................ 12
Top Wash Only .............................................................. 12
Econo Dry...................................................................... 12
155˚F (68˚C) Final Rinse ................................................. 12
Hi Temp Wash ............................................................... 12
Delay Start..................................................................... 12
Preparing Dishes ............................................................. 13
Before Operation ............................................................ 13
Option Restrictions.......................................................... 13
Changing a Program After the Unit Has Started ............. 13
Opening the Door After Cycle Has Started..................... 13
DIAGNOSTICS
Entering Diagnostic Mode–325 Model ........................... 14
Entering Diagnostic Mode–450 Model ........................... 15
Fail Codes........................................................................ 18
Parts Location–Control Board.......................................... 19
Control Board Test Points................................................ 20
Control Board Diagnostics .............................................. 21
Door Switch ................................................................... 21
Detergent Dispenser ..................................................... 21
Door Vent–450 Model ...................................................22
Circulation Motor........................................................... 22
Fill Valve ........................................................................ 23
Drain Motor ................................................................... 23
Moisture Sensor............................................................. 23
Wash Diverter ................................................................ 24
Moisture Sensor............................................................. 24
Water Temperature Sensor............................................ 24
Water Pressure Sensor................................................... 25
User Interface Port......................................................... 25
Water heater.................................................................. 25
Description Page
SERVICE DIAGNOSTICS AND PROCEDURES
Dryer Motor–450 Model................................................ 26
Dryer Heater–450 Model............................................... 26
Parts Location–Door 325 Model...................................... 27
Parts Location–Door 450 Model...................................... 28
Door Disassembly............................................................ 29
Outer Door Removal (325 and 450) .............................. 29
Control Panel Removal.................................................. 30
Inner Door Components–325 Model ............................ 30
Center Door Panel Removal–450 model....................... 31
Inner Door Components–450 Model ............................ 32
Detergent Dispenser ..................................................... 32
Door Latch Interlock ...................................................... 33
Inner Door Duct Assembly ............................................ 33
Drying Vent Assembly–450 Model ................................ 34
Door Vent Mechanism–450 Model................................ 34
Power ON Light............................................................. 35
Door Spring and Cable Assembly ................................. 36
Door Hinge Disassembly............................................... 37
Parts Location–Interior..................................................... 38
Lower Spray Arm Removal ............................................ 39
Coarse Strainer Removal ............................................... 39
Fine Strainer Removal.................................................... 39
Base Pan–Front View.......................................................40
Base Cover Disassembly ................................................. 40
Parts Location–Base Unit–325 Model.............................. 41
Parts Location–Base Unit–450 Model.............................. 42
Drain Motor Disassembly ................................................ 43
Wash Diverter Disassembly ............................................. 43
Circulation Motor Disassembly........................................ 44
Water Heater Disassembly .............................................. 45
Water Temperature Sensor Disassembly......................... 46
Fill Valve Disassembly...................................................... 46
Control Board Disassembly ............................................. 47
Motor Controller Board Disassembly .............................. 48
Dryer Motor and Heater Assembly–450 Model .............. 49
Dryer Motor–450 Model.................................................. 51
Water Level Sensor.......................................................... 52
Drying System ................................................................. 53
Troubleshooting Guide.................................................... 54
WIRING DIAGRAMS
Wiring Diagram–325 Model ............................................ 55
Wiring Diagram–450 Model ............................................ 56
Motor Controller Board Wiring Connections .................. 57
Control Board Wiring Connections ................................. 58
Component Information–Electrical Specifications .......... 59
© 2011 Viking Preferred Service

© 2011 Viking Preferred Service 3
Important Information
Safety Information
We have provided many important safety messages
throughout this manual and on the appliance.
ALWAYS read and obey all safety messages. This is
a safety alert symbol.
This symbol alerts personnel to hazards that can
kill or hurt you and others. All safety messages will
be preceded by a safety alert symbol and the word
“DANGER”, “WARNING” or “CAUTION”. These
words mean:
All safety messages will identify the hazard, tell
you how to reduce the chance of injury, and inform
you what can happen if the instructions are not
followed.
To locate an authorized service agent, call:
Viking Customer Service
Phone No. 1-888-845-4641
Address your written correspondence to:
Viking Preferred Service
1803 HWY 82 West
Greenwood, MS 38930
SAVE THESE INSTRUCTIONS
REVIEW ALL SERVICE INFORMATION IN THE APPROPRIATE SERVICE MANUAL AND
TECHNICAL SHEETS BEFORE BEGINNING REPAIRS.
Pride and workmanship go into every product to provide our customers with quality appliances. It is possible,
however, that during the lifetime of a product, service may be required. Products should be serviced only by
a qualified authorized service technician who is familiar with the safety procedures required to perform the
repair and is equipped with the proper tools, parts, testing instruments, and the appropriate service manual.
DANGER
Immediate hazards which WILL result in severe
personal injury or death.
Hazards or unsafe practices which COULD
result in severe personal injury or death.
CAUTION
Hazards or unsafe practices which COULD
result in minor personal injury, product or
property damage.
WARNING
WARNING
To avoid risk of serious injury or death,
repairs should not be attempted by
unauthorized personnel.
CAUTION
VIKING will not be responsible for any injury
or property damage from improper service
procedures. If performing service on your
own product, you must assume responsibility
for any personal injury or property damage
which may result.

© 2011 Viking Preferred Service
Warranty Information
4
Professional Series Built-In Dishwasher Warranty
One Year Full Warranty
Undercounter dishwashers and all of their component parts, except as detailed below*, are warranted to be free
from defective materials or workmanship in normal household use for a period of twelve (12) months from the date
of original retail purchase. Viking Range Corporation, warrantor, agrees to repair or replace, at its option, any part
which fails or is found to be defective during the warranty period.
*Painted and decorative items are warranted to be free from defective materials or workmanship for a period of
ninety (90) days from the date of original retail purchase. ANY DEFECTS MUST BE REPORTED TO THE SELLING
DEALER WITHIN NINETY (90) DAYS FROM DATE OF ORIGINAL RETAIL PURCHASE.
Five Year Limited Warranty
Any upper and/or lower nylon rack which rusts due to defective materials or workmanship and any electronic controls
which fail due to defective materials or workmanship in normal household use during the second through fifth year
from the date of original retail purchase will be repaired or replaced, free of charge for the part itself, with the owner
paying all other costs, including labor.
Any motor/pump assembly or water distribution system component as listed below which fails due to defective
materials or workmanship in normal household use during the second through fifth year from the date of original
retail purchase will be repaired or replaced, free of charge for the part itself, with the owner paying all other costs,
including labor.
Motor/Pump and Water Distribution System Components
Circulation motor/pump; Lower wash arm; Drain motor/pump; Tube to upper wash arm; Fill valve; Upper wash arm
Lifetime Limited Warranty
Any stainless steel tank or inner door liner which develops a water leak due to defective materials or workmanship
in normal household use during the lifetime of the product will be repaired or replaced, free of charge for the part
itself, with the owner paying all other costs, including labor.
Ninety (90) Day Residential Plus Warranty
This warranty applies to applications where use of the product extends beyond normal residential use. Examples
are, but not limited to, bed and breakfasts, fire stations, private clubs, churches, etc. This warranty excludes all
commercial locations such as restaurants, food service locations and institutional food service locations.
This warranty extends to the original purchaser of the product warranted hereunder and to each transferee owner
of the product during the term of the warranty.
This warranty shall apply to products purchased and located in the United States and Canada. Products must be
purchased in the country where service is requested. Warranty labor shall be performed by an authorized Viking
Range Corporation service agency or representative. Warranty shall not apply to damage resulting from abuse,
accident, natural disaster, loss of electrical power to the product for any reason, alteration, improper installation,
improper operation or repair or service to the product by anyone other than an authorized Viking Range
Corporation service agency or representative. Warranty shall not apply to damage resulting from indoor units
being used in outdoor situations. This warranty does not apply to commercial usage. This warranty does not
cover any food or medicine loss due to product failure. Warrantor is not responsible for consequential or
incidental damage whether arising out of breach of warranty, breach of contract, or otherwise. Some jurisdictions
do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or
exclusion may not apply to you.
Owner shall be responsible for proper installation, providing normal care and maintenance, providing proof of
purchase upon request, and making the appliance reasonably accessible for service. If the product or one of its
component parts contains a defect or malfunction during the warranty period, after a reasonable number of
attempts by the warrantor to remedy the defects or malfunctions, the owner is entitled to either a refund or
replacement of the product or its component part or parts. Replacement of a component part includes its free
installation. Warrantor’s liability on any claim of any kind, with respect to the goods or services covered hereunder,
shall in no case exceed the price of the goods or service or part there of which gives rise to the claim.
VIKING RANGE CORPORATION
111 Front Street, Greenwood, Mississippi (MS) 38930 USA
662-455-1200
For more product information, call 1-888-VIKING1 (845-4641), or visit our
web site at http://www.vikingrange.com

© 2011 Viking Preferred Service
Warranty Information
5
WARRANTY SERVICE
Under the terms of this warranty, service must be performed by a factory authorized Viking Range Corporation
service agent or representative. Service will be provided during normal business hours, and labor performed
at overtime or premium rates shall not be covered by this warranty. To obtain warranty service, contact the dealer
from whom the product was purchased, an authorized Viking Range Corporation service agent, or Viking Range
Corporation. Provide model and serial number and date of original purchase. For the name of your nearest
authorized Viking Range Corporation service agency, call the dealer from whom the product was purchased or
Viking Range Corporation. IMPORTANT: Retain proof of original purchase to establish warranty period.
The return of the Owner Registration Card is not a condition of warranty coverage. You should, however, return the
Owner Registration Card so that Viking Range Corporation can contact you should any question of safety arise which
could affect you.
Any implied warranties of merchantability and fitness applicable to the described halogen elements are limited
in duration to the period of coverage of the applicable express written limited warranties set forth above. Some
jurisdictions do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to
you. This warranty gives you specific legal rights, and you may also have other rights which may vary from jurisdiction
to jurisdiction.
VIKING RANGE CORPORATION
£££ÊÀÌÊ-ÌÀiiÌÊUÊÀiiÜ`]ÊÃÃÃÃ««ÊÎnÎäÊ1-
[phone]
www.vikingrange.com
Specification subject to change without notice.

6
© 2011 Viking Preferred Service 6
General InformationGeneral Information
Specifications*
Built-In Dishwasher
Description VDB325
Overall width 23-7/8” (60.6 cm)
Overall height 33-7/8” (86.0 cm) min. to 35” (89.0 cm) max.
Overall depth from rear
To edge of side—24” (61.0 cm)—includes door panel
With door open—49” (124.5 cm)
Cutout width 24” (61.0 cm)
Cutout height 34” (86.4 cm) min. to 35” (89.0 cm) max.
Cutout depth 24” (61.0 cm)
Electrical requirements 15.0 amps, 120 VAC/60 Hz; 3’9” (1.1 m) electrical cord
3-prong plug supplied with unit
Water-heating element rating 1400 watts
Inlet water temperature 120°F (49°C) recommended;
Dishwasher will perform properly with cold water
Note: Cycle times will vary
Inlet water pressure operating range 10 to 125 psi (0.69 to 8.62 bar)
Inlet water hose 5’ (1.5 m) braided stainless steel water line with 3/8” (0.95 cm) compression fitting
connected to dishwasher
Drain hose 7’ (2.13 m) 1/2” (1.3 cm) ID “crimp-proof” flexible drain hose attached to dishwasher,
connections provided for 5/8” (1.6 cm), 3/4” (1.9 cm) or 1” (2.5 cm), cut as required
Drain hose high loop required Height from floor—20” (51.0 cm) min
Approximate shipping weight 152 lbs.
(68.9 kg)
*Go to vikingrange.com for the latest specifications.
Dimensions
23-7/8”
(60.6 cm)
49”
(124.5 cm)
28-3/4”
(73.0 cm)
23-3/4”
(60.32 cm)
26-3/8”
(67.0 cm)
33-7/8”
(86.0 cm) min.
to
35”
(89.0 cm) max.
24”
(61.0 cm)

7
© 2011 Viking Preferred Service 7
General InformationGeneral Information
Specifications*
Built-In Dishwasher
Description VDB450
Overall width 23-7/8” (60.6 cm)
Overall height 33-7/8” (86.0 cm) min. to 35” (89.0 cm) max.
Overall depth from rear
To edge of side—23-3/4” (60.3 cm)—includes door panel
With door open—49” (124.5 cm)
Cutout width 24” (61.0 cm)
Cutout height 34” (86.4 cm) min. to 35” (89.0 cm) max.
Cutout depth 24” (61.0 cm)
Electrical requirements 15.0 amps, 120VAC/60 Hz; 3’9” (1.1 m) electrical cord
3-prong plug supplied with unit.
Water-heating element rating 1200 watts
Inlet water temperature 120°F (49°C) recommended;
Dishwasher will perform properly with cold water
Note: Cycle times will vary
Inlet water pressure operating range 10 to 125 psi (0.69 to 8.62 bar)
Inlet water hose 5’ (1.5 m) braided stainless steel water line with 3/8” (0.95 cm) compression fitting
connected to dishwasher
Drain hose 7’ (2.13 m) 1/2” (1.3 cm) ID “crimp-proof” flexible drain hose attached to dishwasher,
connections provided for 5/8” (1.6 cm), 3/4” (1.9 cm) or 1” (2.5 cm), cut as required
Drain hose high loop required Height from floor—20” (51.0 cm) min.
Approximate shipping weight 157 lbs.
(71.2 kg)
*Go to vikingrange.com for the latest specifications.
Dimensions
23-7/8”
(60.6 cm)
49”
(124.5 cm)
28-3/4”
(73.0 cm)
23-3/4”
(60.32 cm)
26-3/8”
(67.0 cm)
33-7/8”
(86.0 cm) min.
to
35”
(89.0 cm) max.
24”
(61.0 cm)

8
© 2011 Viking Preferred Service 8
General Information
Warnings
Read and follow all instructions before using this
appliance to prevent the potential risk of fire,
electric shock, personal injury, or damage to the
appliance as a result of improper usage of the
appliance. Use appliance only for its intended
purpose as described in this manual.
To ensure proper and safe operation: Appliance
must be properly installed and grounded by a
qualified technician. DO NOT attempt to adjust,
repair, service, or replace any part of your appliance
unless it is specifically recommended in this manual.
All other servicing should be referred to a qualified
servicer.
Water Supply
UÊ Ê7>ÌiÀÊ«ÀiÃÃÕÀiÊvÀÊÌiÊÜ>ÌiÀÊÃÕ««ÞÊÃÕ`ÊLiÊ
a minimum of 10 to 125 psi. The dishwasher is
supplied with a 5’ (1.5 m) braided stainless steel
water line with 3/8” (0.95 cm) compression
fitting connected to dishwasher.
UÊÊ ÊvÌiÀÊ`iÌiÀ}ÊÜiÀiÊÌiÊÜ>ÌiÀÊÃÕ««ÞÊiÊ
will connect to the dishwasher, provide a 2”
(5.1 cm) access hole and run the water supply
line to the approximate fill valve location.
UÊÊ ÊÀÊÃiÀÛViÊVÛiiVi]Ê>ÊÃÕÌvvÊÛ>ÛiÊÌÊ
supplied) should be installed in the supply line
in a readily accessible location (such as beneath
the sink).
UÊÊ ÊÌÊÃÊÀiVi`i`ÊÌ>ÌÊÌiÊ`ÃÜ>ÃiÀÊLiÊ
connected to a hot water supply. If a cold water
supply is used, cycle times will vary.
UÊÊ ÊÌÊÃÊ«ÀÌ>ÌÊÌ>ÌÊÌiÊÜ>ÌiÀÊÃÕ««ÞÊiÊ>`Ê
the shut-off valve have a sufficient flow volume.
Flush the supply line prior to connecting it to
the intake line of the dishwasher.
Drain
UÊÊ Ê/iÊ>VViÃÃÊiÊvÀÊÌiÊ`À>ÊiÊÃÕ`ÊLiÊ
2” square (5.1 cm). Locate as low and as near to
the back wall as possible.
UÊÊ ÊDO NOT use any fittings anywhere in the drain
line that are less than 1/2” (1.3 cm) ID.
UÊÊ ÊvÊÌiÊ`À>ÊiÊÃÊ}}ÊÌÊLiÊViVÌi`ÊÌÊ
a food waste disposer, be sure to remove
the knockout or plug from the fitting before
connecting drain line.
UÊÊ ÊÀ>ÊViVÌÊÃÕ`ÊLiÊ>ÊÕÊvÊ»Ê
(22.9 cm) from the floor. If connection is lower,
siphoning during cycle can occur.
Electrical Connections
This appliance must be grounded. In the event of a
malfunction or breakdown, grounding will reduce
the risk of electric shock by providing a path of
least resistance for electric current.
Note: For this model, a power cord will have to be
purchased separately. The plug must be plugged
into an appropriate outlet that is installed and
grounded in accordance with all local codes and
ordinances.
General Information
WARNING
Plumbing connections must comply with
applicable sanitary, safety, and plumbing codes.
WARNING
The dishwasher has a factory installed back-
flow preventer. DO NOT add an additional
check valve .
WARNING
Be sure electrical power is turned off at circuit
breaker or fuse box before servicing unit.
DO NOT use an extension cord for this appliance.
WARNING
Improper connection of the equipment –
grounding conductor can result in a risk of
electric shock. Check with a qualified electrician
or serviceman if you are in doubt as to whether
the appliance is properly grounded. DO NOT
modify the plug if it will not fit the outlet,
have a proper outlet installed by a qualified
electrician.

9
© 2011 Viking Preferred Service 9
General Information
Warnings
WARNING
EXCESSIVE WEIGHT HAZARD
Use two or more people to move dishwasher.
Failure to do so can result in back or other
injury.
General Information
WARNING
ELECTRICAL SHOCK HAZARD
Electrically ground dishwasher.
Connect ground wire to green ground
connector in terminal box.
DO NOT use an extension cord.
Failure to follow these instructions, can result in
death, fire or electrical shock.
WARNING
TIP OVER HAZARD
DO NOT push down on open door. Doing so
can result in serious injury or cuts.

10
© 2011 Viking Preferred Service 10
General Information
MODEL VDB325SS
120V 60Hz OPER 12.2A
2.5A
OTHER 15.5A
SERIAL NO 092210D00019027
HOUSEHOLD DISHWASHER
VIKING RANGE
CORPORATION
GREENWOOD, MISSISSIPPI
38930 USA
Made in the USA
®
E
CSA
LISTED
3HV V
UL
CUS
01 3597 000
Serial Number
Month
Day
Year of Manufacture
09 22 10 D00019027
General Information
Model–Serial Number Matrix
The serial number and model number for your
appliance are located on the identification plate
mounted on the inside of the unit.
Model Numbers
Serial Numbers
VDB325SS
V=Viking Professional Series
D=Dishwasher
B=Built-In
Version
SS=Stainless

© 2011 Viking Preferred Service 11
Operation
Settings and Functions–325 Model
Wash Cycles
Pots/Pans
Heavily soiled pots, pans and casserole dishes. Long
heated pre-wash loosens up encrusted food. High
temperature main wash and final rinse.
Normal Wash
Normally soiled plates, glasses, bowls, and lightly
soiled pots and pans. Normal pre-wash, main wash
and rinse. Medium pressure and temperature.
Econo Wash
Normally soiled plates, glasses, bowls, and lightly
soiled pots and pans. Lower temperature main
wash and rinse. Longer pre-wash and main wash
to maximize cleaning performance while using less
energy.
Light/China
Lightly soiled dishes or fine china and crystal. Low
temperature wash and rinse. Lightest pressure to
protect dishes.
Rinse/Hold
All dishware. Short, medium pressure rinse with
no heat.
Options
155°F (68°C) Final Rinse
Increases the temperature of final rinse to 155°F
(68°C). Available on Pots/Pans and Normal Wash
cycle.
Delay Start
Lets you delay running the dishwasher for up to
10 hours. To set DELAY START, select the desired
wash cycle and option(s). Press the “DELAY
START” button once and the number “2” will light,
indicating a two-hour delay. If you desire a longer
delay, continue pressing the “DELAY START”
button to a four, six, eight or ten hour delay. The
corresponding number on the button will light.
Once you have set the desired delay time, press the
“START” button and close the door. DELAY START
is not available with the Rinse/Hold cycle.
Control Operation
The following is the basic layout of the control panel and how it is referenced below.
Cycles OptionsStart Key
sVari-Pressure Intelli-Wash
sQuiet Clean System HI TEMP
WASH
DELAY
START
RINSE
HOLD
155˚ FINAL
RINSE
LIGHT
CHINA
SECOND
WASH
POTS
PANS
NORMAL
WASH

© 2011 Viking Preferred Service 12
Operation
Settings and Functions–450 Model
Wash Cycles
Pots/Pans
Heavily soiled pots, pans and casserole dishes. Long
heated pre-wash loosens up encrusted food. High
temperature main wash and final rinse.
Normal Wash
Normally soiled plates, glasses, bowls, and lightly
soiled pots and pans. Normal pre-wash, main wash
and rinse. Medium pressure and temperature.
Econo Wash
Normally soiled plates, glasses, bowls, and lightly
soiled pots and pans. Lower temperature main
wash and rinse. Longer pre-wash and main wash
to maximize cleaning performance while using less
energy.
Light/China
Lightly soiled dishes or fine china and crystal. Low
temperature wash and rinse. Lightest pressure to
protect dishes.
Rinse/Hold
All dishware. Short, medium pressure rinse with
no heat.
Options
Top Wash Only
Washes dishes on top rack only. Uses less water.
Conserves energy. Available on Normal Wash cycle.
Econo Dry
Selects a “no heat” dry. Available on Normal Wash,
Econo Wash and Light China cycles.
155° F (68° C) Final Rinse
Increases the temperature of final rinse to 155° F
(68°C). Available on Pots/Pans and Normal Wash
cycle.
Delay Start
Lets you delay running the dishwasher for up to
10 hours. To set DELAY START, select the desired
wash cycle and option(s). Press the “DELAY
START” button once and the number “2” will light,
indicating a two-hour delay. If you desire a longer
delay, continue pressing the “DELAY START”
button to a four, six, eight or ten hour delay. The
corresponding number on the button will light.
Once you have set the desired delay time, press the
“START” button and close the door. DELAY START
is not available with the Rinse/Hold cycle.
Turning Audible Sound On and Off
To turn off, press Rinse/Hold button for 10 seconds.
The beep stops and the Rinse/Hold LED will flash
two times. To turn on, repeat above instructions.
The audible sound beeps two times and the Rinse/
Hold LED flashes two times to identify that it is on.
Note: The audible sound cannot be disabled for
error messages.
Note: The LED will flash in sync with the audible
sound.
Cycles OptionsStart Key
sVari-Pressure Intelli-Wash
sQuiet Clean System
sAirflow Gentle Dry
ECONO
DRY
TOP
WASH
DELAY
START
RINSE
HOLD
155˚ FINAL
RINSE
LIGHT
CHINA
SECOND
WASH
POTS
PANS
NORMAL
WASH
Control Operation
The following is the basic layout of the control panel and how it is referenced below.

© 2011 Viking Preferred Service 13
Operation
Settings and Functions
Preparing Dishes
It is not necessary to rinse normal food soils off
the dishes before putting them in the dishwasher,
although larger solid particles, such as bones,
seeds, skins, pits, and toothpicks should be
removed.
If you are not going to run the dishwasher
immediately after loading, it is best to rinse salty
and highly acidic foods off stainless steel, silver,
and silverplate flatware. Prolonged contact of
foods—including lemon juice, salt, vinegar, mustard,
mayonnaise, and salad dressings—with stainless
steel can cause corrosion (pitting).
Before Operation
1. Load the dishes per recommended loading.
2. Make sure there is rinse agent in the dispenser.
Add rinse agent if needed.
3. Add proper amount of detergent and pre-wash.
4. Select the desired cycle and option(s).
5. Push both top and bottom racks in.
6. Press “START”. The START symbol will
illuminate to indicate the unit is ready.
7. Close the door tightly until you hear a click,
otherwise the dishwasher will not start.
Option Restrictions
All options are not available for all cycles.
Please note the following:
UÊ Ê/iÊ«ÌÊÊ/i«Ê7>ÃÉ£xxÂÊÈnÂ®Ê
Final Rinse is not available in the ECONO
WASH/ECONO CHINA.
UÊÊ Ê Ê«ÌÃÊ>ÀiÊ>Û>>LiÊÊÌiÊ, -É"Ê
cycle.
After selecting the wash cycle and options, depress
“START” button. The START symbol will illuminate.
This merely means the machine is ready. Close door
securely within four seconds of pressing the START
button.
Changing a Program After the Unit Has Started
The dishwasher is programmed to stop operating
if the door is opened during a cycle. To change a
program or option after starting the machine, open
the door slightly to let the spray arms stop rotating
and avoid getting sprayed with water. Press and
hold “START” for four seconds to cancel the current
selection, then press the touchpad(s) for your
desired selection.
Press “START” again and close the door. The drain
pump will run to remove any dirty water from the
dishwasher before starting the newly selected cycle.
Check to make sure there is still detergent in the
detergent dispenser.
Opening the Door After Cycle Has Started
If the door is opened after the cycle has started,
the START button will flash to indicate that the
dishwasher is in Standby mode. Press the “START”
button and close the door securely within four
seconds to restart the cycle. If a cycle is canceled,
the dishwasher will drain any remaining water in
the unit out.

© 2011 Viking Preferred Service 14
Service Diagnostics and Procedures
Entering Diagnostic Mode–325 Model
To enter the Diagnostic mode on model 325, press the left most program button five times (Pots Pans) and
then immediately press the “start” button.
The test cycle will run approximately 6-1/2 minutes and will run each component individually.
Be sure to close the soap dispenser cup as this function will also be energized opening up the cup.
1. Drains any water in the sump (pressure sensor controlled).
2. Fills until pressure sensor is satisfied (about 1 minute).
3. Soap dispenser activates.
4. Wash arm diverter sets to upper wash arm.
5. Motor circulates at 2500 RPM’s (upper wash arm) with water heater for 10 seconds.
6. Wash arm diverter sets to lower wash arm.
7. Motor circulates at 3100 RPM’s (lower wash arm) with water heater for 10 seconds.
8. Water drains below primary filter level (pressure sensor controlled).
9. Wash arm diverter sets to Filter Clean. Circulate (filter clean) for 10 seconds.
10. Drains all water in the sump (pressure sensor controlled) until empty.
11. 10 second pause–when cycle is complete, you will hear two long beeps. This is the indication that
the test cycle has finished.
Note: During this test cycle, if the Control board senses a failure that it is programmed to monitor, it
will display an error code.
sVari-Pressure Intelli-Wash
sQuiet Clean System HI TEMP
WASH
DELAY
START
RINSE
HOLD
155˚ FINAL
RINSE
LIGHT
CHINA
SECOND
WASH
POTS
PANS
NORMAL
WASH
1
2

© 2011 Viking Preferred Service 15
Service Diagnostics and Procedures
Entering Diagnostic Mode–450 Model
To enter the Diagnostic mode on model 450, press the left most program button five times (Pots Pans) and
then immediately press the “start” button.
The test cycle will run approximately 6-1/2 minutes and will run each component individually.
Be sure to close the soap dispenser cup as this function will also be energized opening up the cup.
1. Drains any water in the sump (pressure sensor controlled).
2. Fills until pressure sensor is satisfied (about 1 minute).
3. Soap dispenser activates.
4. Wash arm diverter sets to upper wash arm.
5. Motor circulates at 2500 RPM’s (upper wash arm) with water heater for 10 seconds.
6. Wash arm diverter sets to lower wash arm.
7. Motor circulates at 3100 RPM’s (lower wash arm) with water heater for 10 seconds.
8. Water drains below primary filter level (pressure sensor controlled).
9. Wash arm diverter sets to Filter Clean. Circulate (filter clean) for 10 seconds.
10. Drains all water in the sump (pressure sensor controlled) until empty.
11. 10 second pause
12. Dryer blower motor and heater will activate for 10 seconds to check amps. When cycle is complete, you
will hear 2 long Beeps. This is the indication that the test cycle has finished.
Note: During this test cycle, if the Control board senses a failure that it is programmed to monitor, it
will display an error code.
sVari-Pressure Intelli-Wash
sQuiet Clean System
sAirflow Gentle Dry
ECONO
DRY
TOP
WASH
DELAY
START
RINSE
HOLD
155˚ FINAL
RINSE
LIGHT
CHINA
SECOND
WASH
POTS
PANS
NORMAL
WASH
1
2

© 2011 Viking Preferred Service 16
Service Diagnostics and Procedures
Fail Codes
LED 1
Pots &
Pans
LED 2
Normal
Wash
Service
Cycle
Only Error Code Cause Action Note
1 1 Moisture sensor
disconnect
Moisture sensor reads out of
normal range
1. Wires disconnected to moisture sensor
in base pan
2. Defective moisture sensor
3. Defective control board
1 2 Motor control
status error
Motor control communicates a
motor operation failure mode
that is most likely caused by the
motor control
1. Wires disconnected between motor
control and motor
2. Defective motor
3. Defective motor control
1 3 Motor control
comms error
Main control cannot succesfully
communicate with the motor
control
1. Wires disconnected between motor
controller and control board
2. Defective Motor control
3. Defective control board
1 4 Diverter
timeout
Main control activates the
diverter,but never sees feedback
from the diverter that the correct
position is eached
1. Wires disconnected between control
board and diverter
2. Defective diverter
3. Defective control board
1 5 Drain error During a drain, the pressure
sensor output never drops to
the“empty” level
1. Verify that dishwasher drain hose is not
clogged or kinked
2. Verify that plug has been removed from
disposal (if so connected)
3. Verify that hose has a high loop per
installation guide
4. Verify that dishwasher is level front to
back and side to side
2 1 Pressure Sensor
Disconnect
Error
Pressure sensor reads out of
normal range low
1. Verify the pressure sensor is properly
connected
2. Defective pressure sensor
3. Defective sensor harness
2 2 Fill Error During a fill, the pressure sensor
output does not reach target fill
pressure
1. Verify water is turned on to dishwasher
2. Verify that fill line is not kinked
3. Verify that dishwasher is level front to
back and side to side
4. Verfiy there has not been a decrease in
water pressure
5. Defective pressure sensor
6. Defective control
2 3 Low Level Error Pressure sensor indicates a water
level lower than the low level
thresMotor Undervoltage Error
1. Low water level in sump (check that
items are secured in rack)
2. Verify that the drain has the proper high
loop
3. Defective pressure sensor
4. Defective main control
2 4 High Level Error Pressure sensor indicates a
waterlevel higher than the high
level threshold
1. Excess water in sump (check that items
are secured in rack)
2. Defective pressure sensor
3. Defective main control

© 2011 Viking Preferred Service 17
Service Diagnostics and Procedures
Fail Codes (cont.)
LED 1
Pots &
Pans
LED 2
Normal
Wash
Service
Cycle
Only Error Code Cause Action Note
2 5 Level Sensor
Error
Sensor level changes abnormally
(drains too fast/ fills to fast)
1. Make sure that unit is level front to back
and side to side
2. Verify that the drain line has the proper
high loop
3. Defective pressure sensor
4. Defective main control
3 1 User Interface–
Main Control
Communication
Error
User interface is unable to
successfully communicate with
the main control
1. Wires disconnected between main
control and user interface
2. Defective cable between main control
and user interface
3. Defective main control
4. Defective user interface
3 2 Yes Pump Flow
Error
Control detects insufficient/
inconsistent water flow through
the wash system and will not
allow the flow through heater to
activate
1. Verify water is fully turned on to
dishwasher
2. Verify that fill line is not kinked
3. Verify that dishwasher is level front to
back and side to side
4. Verify that filters are not clogged
5. Verify that there has not been a
decrease in water pressure
3 3 Drain Pump
Error
Drain pump current sense is out
of range
1. Wires disconnected between main
control and drain pump
2. Defective drain pump
3. Defective main control
3 4 Motor Status
Error
Motor control communicates a
motor operation failure mode
that is most likely caused by the
motor
1. Verify connection between motor
controller and motor
2. Defective motor control
3. Defective machine control
3 5 Motor Under-
voltage Error
Motor control communicates
a low motor control voltage
condition
1. Verify supply voltage is in specification
2. Verify connection at terminal block
3. Verify AC connection to the machine
control
4. Verify connection between machine
control and motor control
5. Defective machine control
6. Defective motor control
4 1 Temperature
Sensor Error
Temperature sensor reads out of
range
1. Wires disconnected to temperature
sensor
2. Defective temperature sensor
3. Defective control board
4 2 Yes Wash Heater
Error
Wash heater current sense is out
of range
1. Wires disconnected between main
control and wash heater
2. Defective wash heater
3. Defective main control
4. Defective temperature sensor
450
only

© 2011 Viking Preferred Service 18
Service Diagnostics and Procedures
Fail Codes (cont.)
LED 1
Pots &
Pans
LED 2
Normal
Wash
Service
Cycle
Only Error Code Cause Action Note
4 3 Yes Dispenser Error Dispenser current sense is out of
range
1. Wires disconnected between main
control and dispenser
2. Defective dispenser
3. Defective main control
4 4 Yes Inlet Valve Error Inlet valve current sense is out of
range
1. Wires disconnected between main
control and inlet valve
2. Defective inlet valve
3. Defective main control
45
5 1 Vent Error Vent current sense is out of range 1. Wires disconnected between main
control and vent
2. Defective vent
3. Defective main control
450
only
5 2 Yes Blower Error Blower current sense is out of
range
1. Wires disconnected between main
control and blower
2. Defective blower
3. Defective main control
450
only
5 3 Yes Dry Heater
Error
Dry heater current sense is out of
range
1. Wires disconnected between main
control and dry heater
2. Defective dry heater
3. Defective main control
450
only
5 4 Yes Current Sense
Error
Main control reads current draw
when no loads are active
1. Defective main control
2. Defective wire harness
5 5 Internal Error Main control or UI detects a
board level failure
1. Defective main control
2. Defective user interface
Flash both LED1
and LED2
continuously
Moisture
Sensor–water
detection
Moisture sensor output is
equivalent to water in the pan
1. Water in base pan from overflow/leak
2. Defective moisture sensor
Flash all LEDs
but start and run
continuously
AC Power Loss Power loss occurred during a
running cycle
1. Power lost during a cycle
2. Reset by pressing and holding start for
3 seconds

© 2011 Viking Preferred Service 19
Service Diagnostics and Procedures
Parts Location–Control Board
(P12)
Water
Heater
(P6)
Water Valve,
Drain Pump,
Diverter
Drying Heater–450 Model
(P5)
Wash Motor
(P9)
User Interface
Port
(P8)
Moisture Sensor,
Temperature Sensor,
Pressure Sensor
(P10)
Water Valve,
Drain Pump
(P2)
Motor
Controller
Board
(P4)
Door Switch,
Detergent Dispenser,
Vent Door–450 Model
(P7)
Drying Motor–450 Model

© 2011 Viking Preferred Service 20
Service Diagnostics and Procedures
Control Board Test Points
The unit has a control board that controls the functions of the dishwasher. Components can be diagnosed via
the control board. With the control board accessed (see Control Board Disassembly procedure, page 43), the
following can be measured:
Component Control Board Test Point Readings (Typical)
Door Switch P4-1 (Red/White) – P4-2 (Yellow) 0 їdoor closed
їdoor open
Start Switch Red – Black Light illuminates blue
Start Switch Red – White 0 їswitch pressed
їswitch not pressed
Dispenser P4-1 (Red/White) – P4-4 (Orange) 14.8 ї
Three-Phase Wash Motor Motor Controller Board 15 їbetween Red and White, Red
and Blue and Blue and White.
Water Valve P6-3 (Blue) – P10-1 (White) 1.1K ї
Drain Pump P6-4 (Brown) – P10-1 (White) 30.6 ї
Diverter (Motor) P6-2 (Gray) – P10-1 (White) 2.7K ї
Diverter (Switch) P6-5 (Yellow) – P10-1 (White) Switch closed – 0 1
Switch open – '
Moisture Sensor P8-1 (Red/White) – P8-2 (Purple) 175K ї
Temperature Sensor P8-3 (Black/White) – P8-4 (Blue) 47K ї#ÇÇÂÊÛ>ÀiÃÊL>Ãi`ÊÊÌi«®
Pressure Sensor P8-6 (Brown) – P8-3 (Black/White) 5 volts DC input
0.5–3.5 volts DC output
Water Heater P12 (Gray) – P10-1 (White) 12.00 ї
Drying Motor (450 only) P7 Red – P7 (Blue) .ї
Drying Heater (450 only) P6-1 (Orange) – P10-1 (White) ї
Vent Door (450 only) P4-1 (Red/White) – P4-3 (Brown) ї
Power On Light P8-5 (Green) – P8-7 (Brown) 5VDC