Sub-Zero Wolf WWD30 User manual

General Information 2
Installation Information 3
Controls & Operation 6
Component Access & Removal 18
Troubleshooting Guide 25
Technical Data 29
Wiring Diagrams 30
subzero.com 800.222.7820
WWD30
Service Manual

Page 2
1-2
General Information WARMING DRAWER WWD30
This manual is designed to be used by Authorized Service Personnel only. Wolf Appliance, Inc. assumes
no responsibility for any repairs made to Wolf appliances by anyone other than Authorized Service
Technicians.
TECHNICAL ASSISTANCE
If you should have any questions regarding a Wolf
appliance and/or this manual, please contact:
Wolf Appliance, Inc.
ATTN: Service Department
P.O. Box 44988
Madison, WI 53744-4988
Customer Service & Parts / Warranty Claims
Phone #: (800) 332 - 9513
Technical Assistance
Phone #: (800) 919 - 8324
Customer Service & Technical Assistance
Facsimile #: (608) 441 - 5887
Parts / Warranty Claims
Facsimile #: (608) 441 - 5886
Service Department e-mail Address
[email protected]
Office Hours:
7:00 AM to 7:00 PM Central Time
Monday through Friday
IMPORTANT SAFETY INFORMATION
Below are Product Safety Labels used in this manual.
The "Signal Words" used are WARNING and
CAUTION.
Please note that these safety labels are placed in areas
where awareness of personal safety and product safety
should be taken.
INTRODUCTION
This Wolf Warming Drawer Technical Service Manual (WWD30), Part #807858, has been compiled to provide the
most recent technical service information about the Wolf Warming Drawer including parts list and exploded views.
This information will enable service technician’s to troubleshoot and diagnose malfunctions, perform necessary
repairs and return a Wolf Warming Drawer to proper operational condition.
The Service Technician should read the complete instructions contained in this technical service manual before initi-
ating any repairs on a Wolf Appliance.
INDICATES THAT HAZARDOUS OR UNSAFE PRAC-
TICES COULD RESULT IN SEVERE PERSONAL
INJURY OR DEATH
Indicates that hazardous or unsafe practices could
result in minor personal injury or product and/or
property damage
In addition, please pay attention to the signal word
“NOTE”, which highlights especially important informa-
tion within each section.
The information and images are the copyright property of Wolf Appliance, Inc., an affiliate of Sub-Zero, Inc. Neither
this manual nor any information or images contained herein may be copied or used in whole or in part without the
express written permission of Wolf Appliance, Inc., an affiliate of Sub-Zero, Inc. © Wolf Appliance, Inc.
all rights reserved.

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1-4
General Information WARMING DRAWER WWD30
WARRANTY INFORMATION
This page contains a summary of the 2 & 5 Year
Warranty that is supplied with every Wolf product, fol-
lowed by a Non Residential Warranty summary, then
notes about the warranties.
TWO & FIVE YEAR Warranty Summary
• Two year TOTAL PRODUCT warranty, parts and
labor.
• Limited Parts Only Warranty for the 3rd through 5th
year on the following parts: heating element, elec-
tronic control system.
NOTE: This warranty only applies to products
installed for normal residential use in the United
States or Canada.
NON RESIDENTIAL Warranty Summary
• Two year TOTAL PRODUCT warranty, parts and
labor.
NOTE: This warranty only applies to products
installed in test kitchens, culinary and school
kitchens, and other installations which help promote
Wolf Appliance products. Restaurant installations and other similar commercial applications carry no warranty.
Warranty Notes:
•All warranties begin at the time of the unit's initial installation.
•All Warranty and Service information collected by Wolf Appliance Inc. is arranged and stored under the unit serial
number and/or the customer's name. It is requested to have the model and serial number available whenever
contacting the factory or parts distributor.
•See Figure 1-1 serial tag location and Figure 1-2 serial tag layout.
Wolf Appliance Company, INC.
VOLTS :
Hz :
MODEL# : WWD30
WOLF WARMING DRAWER
FOR HOUSEHOLD USE ONLY
120
50/60
"DO NOT IMMERSE IN WATER" "NE PAS PLONGE DANS L'EAU"
Fitchburg, WI
SERIAL# :
WATTS:
OUTDOOR APPROVED
Figure 1-1. Serial tag location
Figure 1-2. Serial tag
POWER
ON/OFF
TEMP
HIGH
MED
PRESETS
LOW
TIMER
PROOF
Model Features
Figure 1-4. Keypad Layout
Rack for stacking food
Removable Stainless
Steel Drawer
Stainless Steel Drawer Front
(Classic, Carbon and Platinum
Finishes Available)
Hidden Touch Control Panel
(See Figure 1-4)
Stainless Steel Interior
Galvanized Metal Exterior
LCD Display Power On/Off
Temperature Control Presets
Timer
(Can be used as Kitchen Timer)
Figure 1-3. Control Panel Layout
Serial Tag Located on left front
floor area of inner cabinet with
drawer fully opened

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2-2
Installation Information WARMING DRAWER WWD30
INSTALLATION INFORMATION
The Wolf Warming Drawer is designed to be set into a built-in wall or cabinet installation.
This section of the manual covers some of the installation issues that a service technician may need to know when
servicing a Wolf warming drawer. If additional installation information is needed after reviewing this section of the
manual, please refer to the installation guide or contact Wolf Appliance Co., LLC Customer Service Department at
[phone].
Electrical Requirements:
NOTE: All National Electrical Code regulations must be followed. In addition, be aware of local codes and ordi-
nances when installing your service.
• Dedicated 110 to 120 Volts AC, 60Hz, 15 or 20 ampere fused electrical supply
• Separate electrical circuit serving only this appliance
• A properly grounded 3-prong receptacle
NOTE: For outdoor applications, the unit must be be connected to a properly grounded GFCI circuit.
Line
Voltage
(Power)
Neutral
Ground
TO AVOID SHOCK HAZARD, THE INSTALLATION SITE MUST BE EQUIPPED WITH A PROPERLY GROUNDED
3-SLOT RECEPTACLE TO MATCH THE 3-PRONG (GROUNDED) POWER SUPPLY CORD PROVIDED ON THE
APPLIANCE.
TO AVOID SHOCK HAZARD, NEVER REMOVE THE GROUND PRONG FROM THE PLUG OF THE POWER
SUPPLY CORD.
Figure 2-1. Electrical Receptacle
NOTE: This appliance must be installed in accordance with National Electrical Codes, as well as all state, munici-
pal and local codes. The correct voltage, frequency and amperage must be supplied to the appliance from a dedi-
cated, grounded circuit which is protected by a properly sized circuit breaker or time delay fuse. The proper voltage,
frequency, and amperage ratings are listed on the product rating plate.

Page 5
Installation Information
WARMING DRAWER WWD30
2-3
Cabinet Supports:
NOTE: When the warming drawer is installed with a built-in oven, additional clearance between openings may be
required. Check that oven supports do not obstruct the interior dimensions required for the warming drawer.
NOTE: Dimensions in parentheses are in millimeters unless otherwise specified.
The warming drawer may be supported by either a solid platform or 2" (51) x 2" (51) or 2" (51) x 4" (102) runners.
The platform or runners must be level, rigidly mounted and flush with the bottom edge of the opening. They must
be able to support 200 lbs. (90.7 kg).
NOTE: Make sure that the platform or runners are level. There is no way to level the warming drawer once it has
been installed.
Warming Drawer Installation:
Install a 2" (51) x 2" (51) or 2" (51) x 4" (102) anti-tip block
against the rear cabinet wall.
Turn power off to the electrical outlet.
Slide the left corner of the warming drawer into the open-
ing.
NOTE: A 6 foot power cord is supplied with the unit.
Depending on the outlet location, the unit can be set in
front of opening and plugged in.
If the electrical outlet is installed inside the opening, plug
the power cord into the outlet. The excess cord should be
coiled and secured directly behind warming drawer. If the
outlet is located in an adjacent cabinet, thread the power
cord through the hole in the cabinet wall. Push the drawer
back into the opening until the front flange is flush with
the cabinet front. Make sure the power cord does not get
trapped under the warming drawer.
Open the warming drawer to its full extension.
Drill pilot holes in each corner of the warming drawer through holes in the side frame and install the wood screws
provided with the unit. (See Figure 2-2)
Figure 2-2. Drilled Pilot Holes for Securing Unit
Pilot Holes
MODEL WWD30
with Stainless Steel Drawer & Integrated Front
Overall Width 297/8" (759)
Overall Height 101/4" (340)
Overall Depth 27 1/8” (689)
Overall Depth (behind frame) 231/2" (597)
Minimum Cabinet Width 30" (762)
Minimum Cabinet Depth 24" (610)
Minimum Base Support 200 lbs (91 kg)
Opening Width 28 5/8" (727)
Opening Height 91/8" (232)
Opening Depth 237/8” (606)
Dimensions may vary to +
–1/8" (3).
Allow 3/8” (11) Additional depth for cord thickness
(597)
BEHIND FRAME
297/8"(759)
OVERALL WIDTH
9"
(229)
101/4"
(260)
23 1/2”
27 1/8” (689)
OVERALL DEPTH
Figure 2-4. Overall Cabinet Dimensions
Installation Specifications:
The following pages provide the overall dimensions, finished rough
opening dimensions and electrical placement for the Wolf warming
drawer with stainless steel drawer front. For information on integrat-
ed Drawer Fronts, see the installation instructions provided with the
product.
Wolf recommends using a 33" (838) wide cabinet for the warming
drawer with stainless steel drawer front. A minimum 30" (762) wide
by 24" (610) deep cabinet is required with a minimum base support
of 200 lbs (91 kg). (See Figure 2-3 and 2-5)
Figure 2-3. Overall Unit Dimensions
Anti-Tip Block

Page 6
Undercounter Installation:
For undercounter installations, 23 5/8"
(600) from the bottom of the warming
drawer opening to the floor is recom-
mended. Electrical can be installed
anywhere except location shown. A
minimum of 5" (127) above the floor
or 1" (25) above the toe kick.
The Wolf warming drawer with stain-
less steel drawer front may be
installed below an electric or gas
cooktop, provided the warming drawer
is fully enclosed, top and bottom.
Refer to installation instructions for
the cooktop for additional specifica-
tions. Dimensions will vary according
to the specific installation.
(See Figure 2-5)
Warming Drawer Installation with Built-In Oven:
The Wolf warming drawer with stainless steel drawer front may be installed below or above a Wolf 30" (762) single
oven, provided the warming drawer is fully enclosed, top and bottom. See Figure 2.6
NOTE: Dimensions will vary according
to the specific installation.
The Wolf warming drawer is designed
and agency approved for installation
with Wolf built-in ovens. See the label
attached to the top of the warming draw-
er for approved models.
The warming drawer platform must be
able to support 200 lbs. (91 kg). It must
be a minimum of 1" (25) above the toe
kick to allow for the overlap of the warm-
ing drawer trim.
NOTE: Additional clearance between
warming drawer and oven openings may
be required. Check that oven supports
do not obstruct the interior dimensions
required for the warming drawer.
When the warming drawer is installed
below a built-in oven, a minimum of
2 3/8" (60) between warming drawer
and oven openings is required for clear-
ance of overlaps. When installed above
a built-in oven, a minimum of 2" (51) is
required.
NOTE: When the warming drawer is installed above a built-in oven, a 2" (51) platform with a decorative edge is
required to allow for clearance of overlaps.
28 1/2" (724)
33" (838)
RECOMMENDED CABINET WIDTH
30" min (762)
28 5/8" (727)
WARMING DRAWER
OPENING WIDTH
E
5"
(127)
4"
(102)
ALLOW FOR
5/8" (16)
OVERLAP OF
DRAWER FACE
ON ALL SIDES
NOTE:Refer to the built-in 30" (762) single oven specifications for electrical location.
30-INCH OVEN
ROUGH OPENING
PLATFORM APPLICATION
24" min (610)
CABINET DEPTH
7/8"
(22)
91/8" (232)
OPENING
HEIGHT
23 7/8"min(606)
OPENING DEPTH
27 3/16"
(691)
24" min
(610)
7/8" (22)
PLATFORM
2-4
Installation Information WARMING DRAWER WWD30
285/8" (727)
OPENING WIDTH
E
5"
(127)
4"
(102)
33"(838)
RECOMMENDED CABINET
WIDTH 30” min (762)
36" (914)
STANDARD
FLOOR TO
COUNTER
HEIGHT
5" min (127)
BOTTOM
OF OPENING
TOFLOOR
24" min (610)
CABINET DEPTH
91/4" (235)
OPENING
HEIGHT
237/8"min (606)
OPENING DEPTH
2"(51)x2"(51)
ANTI-TIP BLOCK
ALLOW FOR
5/8” (16)
OVERLAP OF
DRAWER FACE
ON ALL SIDES
DIMENSION
WILL VARY*
* Allow enough room for placement of anti-tip block and drawer face overlap.
Figure 2-5. Undercounter Installation
Figure 2-6. Installation with Built-In Wall Oven

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Electronic Control Information WARMING DRAWER WWD30
GENERAL INFORMATION:
Electronic control will provide temperature control in the warming drawer as determined and set by user. Up and
down arrow keys are provided to increase and decrease, respectively, the temperature of the drawer and operation
time. Temperature control range of the warming drawer main board control will be 80ºF to 200ºF (26.7ºC to 93.3ºC).
Amplitude of this temperature control will be ± 5ºF. When the control sees a temperature at the thermistor 5ºF above
setpoint, control will open the element relay. Once the control sees a thermistor temperature of 5ºF below setpoint,
the relay will close allowing element to cycle on.
Power/Relay Board
Circulation Fan
Element
Display Board/
Keypad
Flex Cable
(Inner ceiling)
(Network Cable)
Electronic Control Board
(Behind Front Panel)
Door Switch
(Bottom of Drawer Front)
Display
Beeper
CONTROL (all low
temp components)
Keypad
Communications
Thermistor POWER BOARD
AC Fan
Element
(850W)
Flex Cable
Door Input
DLB
(CB/CE Model only)
Figure 3-1. Component Location Top View.
Figure 3-2. Electronic Control System Diagram.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
LCD Display Power On/Off Temperature
Controls Preset Controls Timer Controls
Figure 3-3. Keyboard Layout.

Page 8
Electronic Control Information
WARMING DRAWER WWD30
3-3
DESCRIPTION OVERVIEW:
Element:
The element will be powered by the element relay (normally-open contacts). This allows the element to be disabled
under most conditions. Only during a call for heat from the main controller, will the element relay be energized.
Fan:
The fan will be powered by the fan relay (normally-open contacts). This allows the fan to be disabled under most
conditions. Only during a warming mode from the main controller, will the fan be in use.
Drawer Input:
The drawer switch will be a normally open switch, (when drawer is open), and closed when drawer is closed.
When drawer is opened and is in a normal heating mode, unit will de-energize relays to fan and element. If back
lighting of the LCD is enabled, then opening of the drawer will turn on back lighting, and by closing the drawer, back
lighting will go off.
NOTE: Sabbath mode has unique requirements. Please see Sabbath mode this section.
User Display:
The user display shows warming drawer preset temperature, any timed feature which is in process, and whether the
unit is in Proof mode. Other indicators include the ‘ON’ indicator which notes when unit is heating, (always on when
in the Sabbath mode), and displays which temperature units, (°F or °C), the temperature is being displayed in.
This area also informs user if there is an issue with the control and will display an error code in the temperature
and/or timer display. The user display numbers will be displayed as shown in the following pages.
The characters in the user display will only be illuminated when a normal warming mode, service diagnostic mode, or
kitchen timer is being used. At all other times, display will be remain off.
The “PROOF” is on anytime “PROOF” mode is being used.
The “ON” indicator is on anytime control is calling for heat. The exception is during Sabbath mode where the ”ON”
indicator stays on constantly.
NOTE: “TIMER” is on anytime there is a timed warming event or if kitchen timer is being used.
NOTE: “TIMER” is not an option in Sabbath mode.
POWER Key:
The “POWER” key is used to turn unit on and off. While unit is in “OFF” mode, the Power key and “TIMER” up and
down arrow keys remain active. If unit is powered up and Power key is pressed, the display will turn off along with
any associated backlighting. If unit is off and the Power key is pressed, the control backlighting (if applicable), will
turn on and the rest of the keys will be active.
NOTE: If no other key is pressed within 20 seconds, unit will turn off.
TEMP Up/Down Key:
The “TEMP” up or down arrow keys can be used to adjust temperature. By pressing and holding the up or down
arrow, unit will begin changing at the rate of 1º per ½ second until the first 5º increment is obtained. If the user con-
tinues pressing, control will increment in 5º increments per ½ second. The “TEMP” up or down arrow keys remain
active as long as control is On.
NOTE: Exception to this is in the Sabbath Mode.
NOTE: Temperature range is 80ºF to 200ºF, except in “PROOF” mode where maximum temperature is 120ºF.
TIMER Key:
The “TIMER” up or down arrow key is used to change time left in normal warming mode. Timer keys can also be
used as a Kitchen Timer. The rate of this ascension shall be ½ second per increment and in the following order: one
minute from 1-5 minutes; every five minutes from 5-30 minutes; 30 minute increments up to 5 hours; then hourly up
to 24 hours. At any time during a Normal Heating Mode, operator can adjust time left for warming by pressing
“TIMER” up or down arrow keys.
NOTE: The exception to this is during the Sabbath Mode (only the “Power On/Off” key is active in this mode).

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3-4
Electronic Control Information WARMING DRAWER WWD30
SYSTEM MODES:
The control can be placed into several different operational modes which changes preset conditions inside the warm-
ing drawer. Details as to what each mode does to the operation of the drawer can be found below.
POWER UP:
Power up is defined as the initial powering of unit through electrical cord. Not to be confused with pressing “Power
On/Off” key, defined as turning the unit on/off. Upon product power up, all segments of the LCD will illuminate for 5
seconds before going into a unit off mode.
NOTE: There will be a delay of 5 - 10 seconds before LCD will illuminate after power up.
After entering unit off mode, display will show “PF” in the time display until user presses a button. If unit was previ-
ously in a warming mode prior to power loss, control will also emit a power failure chime every 30 seconds while dis-
playing “PF” until the “Power On/Off” is pressed.
NOTE: Pressing any key will clear “PF” error and unit will operate normally.
ON MODES:
On Modes control behavior of electrical components of the warming drawer when unit is “ON”. Unit can be placed
into “ON” mode by pressing the“Power On/Off” button from an “OFF” Mode. Any back lighting will be immediately
activated when “Power On/Off” key is pressed and “- - -‘ will be displayed in the temperature display with the respec-
tive temperature scale (F or C) blinking. (See Figure 3-4)
NOTE: If no other key is pressed within 20 seconds, unit will turn off.
NORMAL WARMING MODE:
Normal warming mode is the basic operating mode when power is turned on and any warming function is selected.
This will include heating by the element and circulation of air by use of the fan.
Mode Entry:
The unit can be placed into a normal warming mode by simply pressing the “Power On/Off” button followed by either
“TEMP” up or down arrow keys, or any preset is pressed. (See Figure 3-4)
NOTE: If no other key is pressed within 20 seconds, unit will turn off.
Operations:
Once unit is turned on and “TEMP” up or down arrow is pressed, unit will initiate at 120°F and can be adjusted in
increments of 1°F. If you press and hold either arrow, the display will increase by 1° each 1/2 second until the first 5°
increment is obtained then will increase by 5° per 1/2 seconds. (See Figure 3-5)
NOTE: Temperature is adjustable from 80°F to 200°F (26.7°C to 93.3°)
Mode Exit:
Pressing “Power On/Off” key will terminate Normal Warming Mode and shut unit off.
NOTE: The mode will also exit by reaching ‘0:00,’ on the timer. At this point, ‘0:00’ will begin flashing and the ele-
ments and fan will shut off. The control will also yield three chimes every 30 seconds to denote unit has shut off.
After 5 minutes the timer will self power down if the “Power On/Off” key is not pressed.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-4. Power On Mode.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-5. Temperature Adjustment in Normal Warming Mode.

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Electronic Control Information
WARMING DRAWER WWD30
3-5
NORMAL WARMING MODE:
Operations: (Continued)
If temperature of unit is greater than 10ºF above setpoint, control will chime and “hot” will flash in the temperature
display. Control will continue to check if temperature has dropped, every 20 seconds. Once temperature, as moni-
tored by the thermistor, is within 10°F of set temperature, set temperature will be displayed and resume cycling nor-
mally. “HOT” indicator will no longer be illuminated. (See Figure 3-6)
NOTE: If drawer is closed at the time of power down, control will initiate a failure tone.
NOTE: If no time is set, timer will automatically default to 4:00 hours. This ensure a definitive stop time. This does
not occur in Sabbath Mode.
NOTE: If any presets are depressed, unit will begin to function. See Preset for further information.
NOTE: During normal warming mode, all keys remain active to allow for changes to mode.
PRESET MODES: (High, Medium and Low Presets)
Mode Entry:
Press “Power On/Off” button followed by either the HIGH, MED or LOW preset key. (See Figure 3-7)
NOTE: “TIMER” will illuminate and flash when first entering mode. Once mode is active the “TIMER” will no longer
be illuminated.
NOTE: If no time is set, timer will automatically default to 4:00 hours. This ensures a definitive stop time.
Operations:
When “HIGH” Preset key is depressed, control will display “200F” in temperature display. For “MED” temperature
display will read “160F” and for “LOW” temperature display will read “120F”. In timer area of display, “4:00” along
with “TIMER”’ will be flashing. Temperature can be adjusted by pressing the “TEMP” up or down arrow keys. By
touching the “TIMER” up or down arrow keys, additional time can be added or subtracted. Anytime a change is
being made, the control begins flashing the changing value. Mode activation time for the control will be 2 seconds
and the “ON” indicator will illuminate and “TIMER” will no longer be illuminated.
Mode Exit:
Pressing “Power On/Off” button will cancel preset and any related timer feature of this mode. If timer expires during
preset mode, and after signaling end of time chime for 5 minutes, the unit will time out and power off.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-6. “HoT” Indication if Temperature of unit is 10° above setpoint.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-7. Example of “LOW” preset.

Page 11
3-6
Electronic Control Information WARMING DRAWER WWD30
PRESET MODES: (Proof Mode)
Proof mode allows the customer to use the warming drawer for bread dough proofing. (See Figure 3-8)
Mode Entry:
Press the “Power On/Off” button followed by the “PROOF” key.
Operations:
Upon pressing the “PROOF” key. Control will display “85F” in the temperature display. In the timer area of display,
‘“4:00” along with “TIMER” will be flashing. Temperature can be adjusted by pressing the “TEMP” up or down arrow
keys. By touching the TIMER up or down keys, additional time can be added or subtracted from this mode. Anytime
a change is being made, the control begins flashing the changing value.
The mode activation time for the control will be 2 seconds at which time the ‘ON’ indicator will illuminate and
changes will be applied and additional indicators will stop flashing.
NOTE: Circulation fan runs while heating element is on during Proof Mode.
NOTE: If the unit is greater than 10ºF above the setpoint, control will chime and “hot” will flash in the temperature
display until the unit temperature is within 10° of set temperature. The control will continue to check if temperature
has dropped every 20 seconds.
Mode Exit:
Pressing “Power On/Off” button will cancel this mode and any related timer feature. If timer expires during “PROOF”,
and after signaling end of time chime for 5 minutes, unit will time out and power off.
TEMPERATURE MAINTENANCE:
During temperature maintenance, element and fan maintains drawer temperature to setpoint temperature. Fan is on
while element is on during warming mode, (as long as drawer switch returns a drawer closed value). If element has
cycled off, fan will continue to circulate air inside drawer for a pre-determined time before turning off. Fan will then
re-energize when element is turned back on during a call for heat.
PREHEAT:
Preheat can be described as the control operation occurring when trying to raise the temperature from more of an
ambient temperature to the operating temperature desired by the user.
Mode Entry:
The unit can be placed into a preheat mode by simply pressing the “Power On/Off” button and any other keys, when
the drawer is cool (room temperature or less than setpoint).
Operations:
If the “TEMP” up or down arrow key is pressed, unit will initiate at “120F” and can be adjusted in increments of 1°.
NOTE: If you press and hold either arrow, the display will increase by 1° each 1/2 second until the first 5° increment
is obtained then will increase by 5° per 1/2 second.
During preheat, control temperature read out will toggle between the setpoint and actual drawer temperature. At
temperatures lower than 85F, “LO” will be displayed. Temperatures equal to or greater than 85F, the actual tempera-
ture measured by the thermistor and setpoint temperature, will be toggled back and forth at a rate of 5 seconds.
Once temperature has reached desired setpoint temperature, control will emit a chime.
Mode Exit:
A press of the “Power On/Off” key will terminate Preheat mode and shut unit off.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-8. Example of “PROOF” preset.

Page 12
Electronic Control Information
WARMING DRAWER WWD30
3-7
END OF WARMING TIME:
Upon reaching “0:00”, “0:00” will begin flashing. Element and fan will shut off at this time. Control will also emit
three chimes every 30 seconds to denote unit has shut off. After 5 minutes the timer will power down and turn unit
off.
NOTE: Operator can cancel chime earlier by pressing the “Power On/Off” key.
OFF MODES:
This mode is obtained by pressing the “Power On/Off” key once unit is in any “On” mode. All active modes on unit
will be cancelled, including Sabbath Mode.
TIMER MODE:
This allows the unit to be used as a kitchen timer, if so desired. (See Figure 3-9)
Mode Entry:
To set timer, first depress “TIMER” up or down arrow keys. “TIMER” will be flashing in display. Press “TIMER” up
arrow key and unit begins counting up from “00:00”.
NOTE: Pressing and holding “TIMER” up or down arrow key, display will increase, or decrease, by 1 second each
1/2 second until the first 5 second increment is obtained then will increase by 5 seconds per 1/2 second. If “TIMER”
up or down arrow key is depressed for longer than 30 seconds display will increase by 30 minute increments each
1/2 second until 5:00 Hours is reached then increase in one hour increments up to 24:00 hours.
NOTE: Timer will count up in time with 1 minute as the minimum setting and going up to 24:00 (hours:minutes).
Operations:
In Timer mode, the temperature display will show nothing and “ON” indicator will not illuminate.
Once set, this timer will count down in hours and minutes. Upon reaching 1 minute, the control will produce an audi-
ble tone.
Mode Exit:
Upon reaching “0:00”, “0:00” will begin flashing. The control will also chime three times every 30 seconds to denote
the unit has shut off.
NOTE: After 5 minutes the timer will power down.
NOTE: Timer mode can be cancelled at any time by pressing the “Power On/Off” key.
NOTE: Operator may cancel chime by pressing “Power On/Off” key. This will also remove the flashing “0:00” from
display.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-9. Example of “TIMER” mode set at 4 minute.

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3-8
Electronic Control Information WARMING DRAWER WWD30
SABBATH MODE:
To accommodate Sabbath holidays, a special mode exists where control will only react to the “Power On/Off” button.
In Sabbath Mode, control display will not change. “ON” remains on all the time. LCD back lighting will also remain
on at all times during this mode at a rate of 50% normal power.
Mode Entry:
Starting from a unit “Off” mode, hold “Power On/Off” button for 5 seconds. (See Figure 3-10)
Operations:
The control will flash “SAb” in timer display area and selections can be made for 5 seconds, while the “SAb” is flash-
ing, at which time control will emit a tone twice and unit will remain in Sabbath mode.
NOTE: If back lighting was turned off prior to entering Sabbath mode then back light will remain off. See Back
Lighting Display Change instructions, this section, for details on how to enable or disable.
NOTE: Selections for Sabbath mode include “TEMP” up or down arrow buttons and any “PRESET” buttons.
NOTE: “TIMER” up or down arrow buttons will yield an invalid key press in Sabbath mode.
NOTE: If unit power is interrupted (unplugged), unit will return to Sabbath Mode upon next power up.
Once in Sabbath mode, unit will continue to say “SAb” in “TIMER” display area. While in Sabbath mode, control will
not show any changes to display. This includes “ON” light in display remaining on at all times during Sabbath mode.
Element can cycle as it would in normal warming mode. Fan runs while element is on and for a short period of time
after element turns off. If after Sabbath mode is entered and a second keypress does not occur, the unit will time out
after 10 seconds and go into a unit “OFF” mode. If drawer is opened, fan and element will not shut off.
NOTE: If drawer is open for longer than 1 minute, element will randomly turn on and off.
NOTE: If drawer is open and the unit calls for heat, element will randomly turn on and off.
Mode Exit:
A press of the “Power On/Off” key will terminate Sabbath mode and shut off unit at any time.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-10. Press and hold Power On/Off for 5 second to enter Sabbath Mode.
SHOWROOM MODE:
Showroom mode allows unit to be run in a demonstration mode. Heating element and fan operation are disabled.
Mode Entry:
Starting from Unit Off mode, press “Power On/Off” key along with “HIGH” and “LOW” PRESET keys for 5 seconds.
A single soft tone will signify unit is in showroom mode and “Sr” will show in timer display. (See Figure 3-11)
NOTE: If power is turned off to unit, showroom mode will remain active.
NOTE: If unit power is interrupted (unplugged), unit will leave showroom mode upon next power up.
Operations:
Unit will function just as it normally would, but the fan and element will not energize while in this mode. The unit can
be turned on and/or off, temperature adjusted, and timer used, but the unit will not provide heat/air circulation.
Mode Exit:
Another press of the same key combination from the Showroom mode will toggle showroom mode off.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-11. Press and hold Power On/Off, HIGH and LOW PRESET Buttons simultaneously for 5 seconds.

Page 14
Electronic Control Information
WARMING DRAWER WWD30
3-9
USER PREFERENCE SETUP
NOTE: Following changes must be made when unit is in “ON” mode.
Preset Change:
Changes can be made to presets by completing the following sequence. Press “Power On/Off” key, then press pre-
set key you wish to change and hold for 5 seconds. After 5 seconds, timer display, temperature display and “TIMER”
will illuminate and flash. Using “TEMP” up or down arrow keys, and/or the “TIMER” up or down arrow keys, change
the values to your own personalized presets. After all settings are complete, press and hold the preset key being
changed for 5 seconds again. Three quick tones will signify preset has been changed and unit will shut off.
NOTE: “PROOF” mode can only be adjusted from 80°F to 120°F.
NOTE: Unit will turn off after 30 seconds if no key presses are made.
NOTE: Changes to preset mode entered will be saved only if key being changed is pressed and held for 5 seconds
after making changes.
USER PREFERENCE OFFSETS (UPO)
NOTE: Following changes must be made when unit is in “OFF” mode.
NOTE: See Figure 3-20 for a quick reference to keystrokes to enter modes and features.
Temperature Display Preference:
Control can be switched between Fahrenheit or Celsius by pressing and holding both “TEMP” up and down arrow
key for 5 seconds. Use the “TEMP” Up or Down arrow key to change from °F to °C or °C to °F. (See Figure 3-12)
NOTE: Press “Power On/Off” key to exit and save changes.
Display Contrast Change:
Display contrast can be adjusted by pressing and holding both the TIMER up and down arrow keys for 5 seconds.
Use the “TIMER” Up and/or down arrow keys to change contrast from the preset. (See Figure 3-13)
NOTE: Contrast setting is from 0 to 15 with 15 being the darkest contrast setting. Unit default is 7.
Press the “Power On/Off” key to exit and save changes.
NOTE: Unit will turn off after 30 seconds if no key presses are made.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
TEMPTEMPTEMP
ON TIMER
Figure 3-12. Press TEMP up and down arrow key to enter. Press TEMP arrow up or down to change scale.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
TEMPTEMPTEMP
ON TIMER
Figure 3-13. Press TIMER up and down arrow key to enter. Press TIMER arrow up or down to change scale.

Page 15
3-10
Electronic Control Information WARMING DRAWER WWD30
LED Back Lighting Change:
Mode Entry:
Enter backlight setting preference by pressing and holding both “TEMP” and “TIMER” up arrow keys for 5 seconds.
Current backlight setting will appear in display. (See Figure 3-14)
Operations:
Use “TIMER” up arrow key to select the various setting. Setting will be saved and recalled in the event of a power
loss. Three settings available are Continuous mode Off (off bclt ALL, Continuous mode On, and ALL disabled.
Default setting is Continuous Mode Off.
Continuous mode refers to the Sabbath mode where appliance is running continuously and backlight can be selected
to be off or on.
Continuous mode On, refers to backlight on continuously at a reduced illumination level to conserve `
LED life. Outside of Sabbath mode, backlight works as normal based on drawer state at full illumination.
NOTE: Left side of display will show “On” continuously, and the right side of display will flash between “bclt” and
“Sab”.
Continuous mode Off, refers to backlight continuously off only in Sabbath mode. Outside of Sabbath mode, back-
light works as normal based on drawer state at full illumination.
NOTE: Left side of display will show “Off” continuously, and the right side of display will flash between “bclt” and
“Sab”.
Disabled mode, refers to backlight is always off regardless of operating mode.
NOTE: Left side of display will show “Off” continuously, and the right side of display will flash between “bclt” and
“ALL”.
Mode Exit:
Once back lighting has been set to desired state, press “Power On/Off” key and setting will be saved.
NOTE: If after 30 seconds of no additional key presses, mode will exit with last known state saved as LCD back
lighting preference.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
TEMPTEMPTEMP
ON TIMER
Figure 3-14. Press TEMP & TIMER up arrow keys to enter. Press TIMER up arrow key to change settings.

Page 16
Electronic Control Information
WARMING DRAWER WWD30
3-11
FIELD SERVICE MODE
Initiating Diagnostics Mode:
Note: Diagnostics mode can only be entered from a unit “‘OFF” state.
Mode Entry:
The Field Service mode can be entered by pressing and holding “Power On/Off” key, along with “MED” and
“PROOF” keys simultaneously for 5 seconds. (See Figure 3-16)
Operations:
Once in this mode, software version will read in timer area. Revision will be displayed initially. (See Figure 3-16)
NOTE: If unit is in Showroom Mode, temperature display will read “Sr” upon entering Field Service Mode. Cycling
of fan, element and drawer is non-functional. Display will show Can, CEL then Sr will be displayed at 1 second per
word then repeat until Field Service Mode is canceled or times out. To use this feature, Showroom Mode must be
canceled. See Showroom Mode for details.
To scroll through errors control has seen, use “TIMER” up or down arrow keys. Once you begin scrolling through
errors, (i.e. “Err 10”, where “Err” is displayed in the temperature readout and “10” is displayed in the timer section).
You can also scroll through additional control information parameters such as total hours used. (See Figure 3-17 &
3-19)
NOTE: Using the opposite “TIMER” up or down arrow key will reverse your previous order.
NOTE: To clear error codes logged, press and hold “TIMER” up and down arrow keys for 5 seconds, while in Field
Service Mode. See Troubleshooting, Section 5, for list of error codes and meanings.
NOTE: Once you have made it through all errors and information parameters, revision of the control will again illu-
minate, starting the sequence over.
Functionality of fan, element and drawer switch can be tested by pressing the “TEMP” up or down arrow key.
(See Figure 3-18)
When checking operation of fan and element, power is either supplied or not supplied based on the selection made.
(See Figure 3-21)
Mode Exit:
Pressing the “Power On/Off key will cancel field service mode.
NOTE: If no other keypresses are noted after 2 minutes, control will also exit field service mode and power down.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-16. Press Power On/Off, MED & PROOF Simultaneously to Enter Diagnostics Mode.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-17. Example of Error 10 displayed.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER
ON/OFF
PROOF
F
TEMPTEMPTEMP
ON TIMER
Figure 3-18. Example of Element ON display.

Page 17
3-12
Electronic Control Information WARMING DRAWER WWD30
Enter Diagnostics rE (Sr if in showroom mode) 0018 (Meaning revision 1.8)
TIMER Err 10
TIMER Err 20
TIMER Err 30
TIMER Err 40
TIMER Err 50
TIMER Err 60
TIMER Con (Control On Time) 1:60 = 16000 hr. (See note below)
TIMER ELE (Element On Time) 95:00 = 950000 hr. (See note below)
TIMER FAn (Fan On Time) 12:60 = 126000 hrs. use (See note below)
TIMER Dor (Drawer Open/Close) 1:60 = 16000 cycles (See note below)
TIMER 119 (Current Temp) deg
KEYPRESS TEMP DISPLAY TIMER DISPLAY
Figure 3-19. Field Service Mode.
Field Service Mode Unique Keystrokes:
NOTE: A colon (:) signifies the need to add two zeros (0) to the time shown. (i.e. 1:60 = 16000)
ERROR CODE TROUBLESHOOTING GUIDE:
ERROR CODE CAUSE TEST / ACTION
10
(Invalid Checksum Error)
20
(Thermistor Open)
30
(Thermistor Short)
40
(Element Sensing)
50
(Door Switch)
60
(Stuck Relay)
70
(Cable Open)
Incorrect checksum
Temperature >300ºF
Temperature <-30ºF
<5º change in temperature over 10
minutes of continuous call for heat.
Occurs only during preheat mode and
the door is closed.
Door switch closed when the keypad is
being operated or unit turned on.
Drawer temperature rises to 250ºF in
any mode/state.
Cable wires that activate element or
fan relays on power board are not
making connection.
Replace Control Board
In FSM (Field Service Mode), view temper-
ature as view by thermistor. Verify wiring
ok to element. Replace Thermistor if ok.
In FSM (Field Service Mode), view temper-
ature as view by thermistor. Verify wiring
ok to element. Replace Thermistor if ok.
If unit outdoors and temperature below
freezing point, instruct on unit limitations.
Verify Thermal Cutout is not open.
Verify Element is not open.
Replace TCO or Element if open.
Check operation of Door Switch with Ohm
meter. Replace if defective.
Check ambient Temp and installation.
Check TCO. Replace if opened.
Replace Relay Board.
Check connection of comm cable. Use
Figure 5-1 to check voltage and/or ohm
reading of cable. If open, replace.
NOTE: After correcting problem, errors must first be cleared in Field Service Mode before controls will refresh error
display. To clear error codes logged, press and hold “TIMER” up and down arrow keys for 5 seconds, while in Field
Service Mode.
Figure 3-20. Field Service Mode.

Page 18
Diagnostic Mode
Resetting Error Codes in Diagnostic Mode
Sabbath Mode
Showroom Mode
HIGH Preset Change (Range of 80°F to 200°F)
(Press HIGH for 5 seconds again to save changes)
MED Preset Change (Range of 80°F to 200°F)
(Press MED for 5 seconds again to save changes)
LOW Preset Change (Range of 80°F to 200°F)
(Press LOW for 5 seconds again to save changes)
PROOF Preset Change (Range of 80°F to 110°F only)
(Press PROOF for 5 seconds again to save changes)
Temperature Scale Change Mode
Display Contrast Change Mode
LED Back Lighting Change Mode
Electronic Control Information
WARMING DRAWER WWD30
3-13
TEMP ELE Func ON (Relay closed,
Element on)
TEMP ELE Func OFF (Relay Opens,
Element Off)
TEMP Fan Func ON (Relay closed, Fan
turns on)
TEMP Fan Func OFF (Relay Opens, Fan
turns Off)
TEMP Dor CLOS if Drawer Closed / OPEn If Drawer Open
KEYPRESS TEMP DISPLAY TIMER DISPLAY “ON” INDICATOR
Figure 3-21. Field Service Mode Functionality Test of Element, Fan & Drawer.
POWER
ON/OFF
PROOF
MED
POWER
ON/OFF
&&5 Seconds
5 Seconds
POWER
ON/OFF
LOW
HIGH
&&5 Seconds
POWER
ON/OFF
Followed by
HIGH
5 Seconds
POWER
ON/OFF
Followed by
MED
5 Seconds
POWER
ON/OFF
Followed by
LOW
5 Seconds
POWER
ON/OFF
Followed by
PROOF
5 Seconds
MODE/FUNCTION KEY PRESSES to ENTER
Figure 3-22. Quick Reference for Mode/Function Entry Key Presses.
Field Service Mode Functional Test Keystrokes:
Mode/Function Unique Keystroke:
&5 Seconds
TEMP &5 Seconds
TIMER &5 Seconds
TEMP &5 Seconds
TIMER
TIMER

Page 19
4-2
Component Access & Removal WWAARRMMIINNGGDDRRAAWWEERRWWWWDD3300
COMPONENT ACCESS AND REMOVAL
This section explains how to access and remove components from a model WWD30 Warming Drawer.
An attempt has been made to arrange these procedures in such a way as to simulate which components would
need to be removed first in order to gain access to other components. When following a component removal proce-
dure, it may be necessary to reference another component removal procedure listed earlier in this section.
NOTE: Before continuing, please take note of the WARNINGS and CAUTIONS below.
- IF IT IS NECESSARY TO REMOVE A VENTILATION UNIT FROM ITS INSTALLATION, REMEMBER THAT
THEY ARE HEAVY AND COULD FALL RESULTING IN SERIOUS INJURY OR DEATH. PULLING A UNIT
FROM ITS INSTALLATION SHOULD ONLY BE PERFORMED BY A TRAINED AUTHORIZED SERVICE
TECHNICIAN OR INSTALLER.
- TO AVOID ELECTRIC SHOCK, POWER TO A VENTILATION UNIT MUST BE DISCONNECTED WHENEVER
ACCESSING AND/OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR
OTHER ELECTRICAL COMPONENTS.
- IF REMOVING THE DRAWER, REMEMBER IT IS HEAVY. IF IT WERE TO FALL IT COULD CAUSE
SERIOUS PERSONAL INJURY.
- Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
- The heating element can get very hot. To avoid personal injury use caution when servicing the unit,
making sure the heater has cooled before working on or around it.
- If accessing components under the shell, the insulation must be properly reinstalled and positioned.
Failure to do so may lead to damage to the surrounding cabinetry.
- Low voltage is used for most electronic control components. To avoid damaging the appliance, do NOT
apply 115V AC to electronic control components.

Page 20
Component Access & Removal
WARMING DRAWER WWD30
4-3
Stainless Steel Drawer Box
The side flanges of the stainless steel drawer box rest
on top of the drawer frame.
To remove the drawer box, begin by opening the drawer
until the stops are engaged. Then, at the center of left
and right side flanges lift drawer box. (See Figure 4-1)
Drawer Removal
The drawer assembly rides on three slide assemblies,
one on each sidewall, and one underneath the drawer.
The slides extend until a stop is reached. The drawer
can be separated from the slide assembly by moving
the drawer release up for the left side and down for the
right and pull for the bottom. (See Figures 4-2 & 4-2A)
Moving the drawer release allows the drawer to be slid
off the slide assembly. A control cable runs along the
right side the drawer and connects to the power board
behind cavity baffle on the rear wall.
To remove the drawer assembly, begin by opening the
drawer fully. Reach inside of unit cavity and disconnect
control cable from power board on the right side of cavi-
ty baffle. Release the control cable from the cable hold
down clips and place free section of control cable in
drawer. On outside of drawer with your index finger,
move the drawer release on side slide assembly. (See
Figure 4-2) At the same time, push drawer slide back
into unit cavity until slide is past the stop. Repeat on
other side. Then, reach under drawer, pulling forward
on bottom drawer release, and pulling drawer forward
until slide is past stop. (See Figure 4-2A)
Continue by pulling drawer off of slide assemblies.
NOTE: Upon reassembly control cable must be
arranged to avoid damage to cable.
(See Figure 4-7 & 4-8)
Figure 4-1. Stainless Steel Drawer Box Removal
Figure 4-2. Left Drawer Release
Figure 4-2A. Bottom Drawer Release
Lift Here
Lift Here
Pull
Drawer is heavy, use care not to damage drawer slides
or scratch frame of unit.