Subzero WOLF UW Series User manual

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General Information MODEL UW-24
MODEL UW-24
IMPORTANT SAFETY INFORMATION
Below are the Product Safety Labels used in this manu-
al. The "Signal Words" used are WARNING or CAU-
TION.
When reviewing this manual, please note these differ-
ent Product Safety Labels placed at the beginning of
certain sections of this manual. You must follow the
instructions given in the boxes below the Product
Safety Labels in order to avoid personal injury and/or
product damage.
The sample Product Safety Labels below illustrate the
precautions that should be taken when the signal word
is observed.
INTRODUCTION
This Technical Service Manual has been compiled to provide the most recent service information for UW-24 units.
This information will enable the service technician to troubleshoot and diagnose malfunctions, perform necessary
repairs, and return a unit to proper operational condition.
The service technician should read the complete instructions contained in this manual before initiating any repairs.
For installation information see Wine Storage Installation Guide available at http://www.subzero-wolf.com/tradere-
sources/product-specifications
For Use and Care information see Wine Storage Use & Care Guide available at http://www.subzero-
wolf.com/traderesources/product-specifications
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 information that is especially
important for the topic being covered.
This manual is designed to be used by Certified Service Personnel only. Sub-Zero Group, Inc. assumes
no responsibility for any repairs made on Sub-Zero refrigeration units by anyone other than Certified
Service Technicians.
Information and images contained in this manual are the copyright property of Sub-Zero Group, 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 consent of Sub-Zero Group, Inc.
© Sub-Zero Group, Inc, all rights reserved.
TECHNICAL ASSISTANCE
If you should have any questions regarding a Sub-Zero
appliance and/or this manual, please contact:
Wolf Appliance, Inc.
ATTN: Service Department
P.O. Box 44988
Madison, WI 53744 - 4988
Customer Care
Phone #: (800) 332 - 9513
Facsimile #: (608) 441 - 5887
Technical Assistance
(For Technicians in Customer’s Homes Only)
Phone #: (800) 919 - 8324
Warranty Claims
Phone #: (800) 404 - 7820
Facsimile #: (608) 441 - 5886
Service Department e-mail Address:
Main Office Hours:
8:00 AM to 5:00 PM Central Time
Monday through Friday
(24/7 Phone Coverage

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MODEL UW-24
MODEL UW-24 General Information
Serial Tag Layout
(The serial number tag is located under the wine control mullion on the handle-side wall)
UW-24/O-RH
Model Number Serial Number Refrigerant Type
Refrigerant Charge Total Amps Date Code
WARRANTY INFORMATION
This page summarizes the 2, 5 & 12 Year Residential
Warranty provided with every Sub-Zero, as well as two
special warranties:
•Non-Residential Warranty - Applies to units installed
in non-residential applications.
•Display/Model Home Warranty - Applies to distribu-
tor or dealer display units, and units in model
homes, sold three years after date of manufacture.
Following the warranty summaries are details and notes
about the warranties.
TWO, FIVE & TWELVE YEAR Warranty
• 2 year TOTAL PRODUCT, *parts and labor.
• 5 Year SEALED SYSTEM, **parts and labor.
• 6th - 12th year LIMITED SEALED SYSTEM, **parts
only.
ONE & FIVE YEAR Non-Residential Warranty
(Example: Office, Yacht, etc.)
• 1 Year TOTAL PRODUCT, *parts and labor.
• 5 Year SEALED SYSTEM, **parts only.
ONE & FIVE YEAR Display/Model Home Warranty
(Display units sold three years after date of manu-
facture)
• 1 Year TOTAL PRODUCT, *parts and labor.
• 5 Year SEALED SYSTEM, **parts only.
Warranty Details:
* Includes, but is not limited to the following:
Electronic Control System Components, Fan & Light
Switches, Fan Motors & Blades, Drain Pan, Drain
Tubes, Wiring, Light sockets & bulbs, Door hinges,
Compressor Electricals, etc. . .
** Includes the following:
Compressors, Condenser, Evaporators, Filter-Driers,
Heat-exchangers, All Tubing that Carries the Freon.
NOTE: Condenser Fan Motors and compressor elec-
tricals are NOT considered sealed system parts.
Warranty Notes:
• All warranties begin at unit's initial installation date.
• All Warranty and Service information collected by Sub-
Zero is arranged and stored under the unit serial num-
ber, and the customer's name.
• Sub-Zero requests that you have the model and serial
number available whenever contacting the factory or
parts distributor.
• The serial tag is located under the wine control mullion
on the handle-side wall.

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General Information MODEL UW-24
MODEL UW-24
MODEL UW-24 FEATURES
6
3
4
5
1
2
FEATURES
1Product Rating Plate
2Electronic Control Panel and Display
3Wine Storage Racks
4Full-View Glass Door
5Home Security System
6Condenser (behind kickplate / grille)

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Electronic Control System MODEL UW-24
MODEL UW-24
MODEL UW-24 ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS
The UW-24 utilizes an electronic control system which monitors, regulates, controls and displays a variety of func-
tions and operations in the appliance.
The table below defines some of the basic electronic control system terminology.
Term/Component Definition / Description
Main Control Board ……....….. The printed-circuit board (PC Board) which contains a microprocessor, relays, and
electrical connections that monitor and control all functions of the appliance.
Microprocessor ………......…... An electrical component on the control board which receives electrical signals from
other components, processes the information, then sends electrical signals to relays
on the board to open or close, switching components in the appliance ON or OFF.
Relay …………………….……. An electrical component on the control board which switches other components in
the appliance ON or OFF when instructed to do so by the microprocessor.
Control Panel Assembly …….. That part of the electronic control system where manual commands are entered via
key-strokes and information is displayed; located between the two wine storage
zones.
Membrane Switch ………..….. An integral part of the control panel assembly consisting of the function keys used
for all input commands to the electronic control system.
Keys (Function Keys) ………… The keys or buttons on the control panel assembly used for manual input opera-
tions.
LED (Light-Emitting Diode) ….. A semiconductor diode that emits light when power is supplied to it. In the control
panel assembly, LED’s are arranged to show values and codes. They are also used
as back-lighting for icons and indicators in the control panel.
Icons/Indicators ……........…..... The words, numbers and symbols visible at and on the control panel assembly.
(Example: temperatures, alarm symbol, service symbol, error/fault codes, etc.)
Set-Point ……………………..... The desired zone temperature, established by pressing the COLDER and/or
WARMER keys.
High Offset (Cut-in)…..……..... During normal operation of a wine storage unit, it is the maximum evaporator tem-
perature the electronic control system will allow before calling for cooling.
Low Offset (Cut-out)……...…... During normal operation of a wine storage unit, it is the minimum compartment air
temperature the electronic control system will allow before interrupting cooling.
Offset Temperature Range …... The difference between the low offset and the high offset.
Thermistor ..........................….. A thermistor or Temperature Sensor is a resistor with which resistance changes as
temperature around it changes. For electronic control system purposes, the micro-
processor detects, monitors and processes this resistance value in order to control
cooling functions as well as displays it as a temperature reading at the control
panel.
Display Units of Measure…….. Temperatures displayed at the control panel may be in Celsius (°C) or Fahrenheit
(°F) units of measure. Switching from one to the other display units of measure is
accomplished through a series of key strokes.
Error (Fault) Codes .………..... The codes that appear at the control panel display windows if the unit experienced
specific problems related to electrical signals supplied to the microprocessor.
Electrical “Pulse”....................... A non-constant supply of voltage, or electrical signal, the duration of which is often
measured in milliseconds.
Electrical Polarity....................... The positive ( + ) and negative ( - ) sides of the alternating current sinewave.

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MODEL UW-24
MODEL UW-24 Electronic Control System
MODEL UW-24 WINE STORAGE ELECTRONIC CONTROL SYSTEM
This page contains a basic illustration of the UW-24 electronic control system (See Figure 2-1). Input operations are
performed at the membrane switch (part of the control panel assembly), with monitoring, regulating and controlling
functions taking place at the control board (located directly behind the control panel). Temperatures and possible
problems with the unit are displayed at the control panel display. The entire electronic control system is described in
greater detail on the following pages.
NOTE: The diagram below is not an exact electrical representation of the electronic control system. For more
detailed electrical diagrams refer to the wiring diagram and schematic supplied with the unit.
Figure 2-1. Basic Model UW-24 Series Electronic Control System
N.C.

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Electronic Control System MODEL UW-24
MODEL UW-24
E3
E2
E1
14 21
J3
81
J2
J1
J8
WINE
CONTROL
BOARD
P3
Figure 2-2. Control Board Layout
Figure 2-3. Control Board Summary Table
DOOR SWITCH DOOR SWITCH INPUT
MODEL UW-24 CONTROL BOARD LAYOUT AND SUMMARY TABLE
The electrical connection points on the wine storage control board are labeled alphanumerically. These labels corre-
spond with the alphanumeric control board summary layout table on the wiring diagram. By referencing the table, it
is possible to identify which components are connected at which connection points on the control board. Below is a
layout diagram of the control board, followed by a copy of a summary table. (See Figures 2-2 and 2-3)
NOTE: All components on the control board are non-replaceable. If problems with the control board are identified,
the complete control board must be replaced.

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Figure 2-5. Switching Unit ON or OFF - Press POWER Key.
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MODEL UW-24
MODEL UW-24 Electronic Control System
CONTROL PANEL LAYOUT
Figure 2-4. Control Panel Layout
TEMP/DOOR
ALARM
&
SERVICE
Icons/Indicators
Upper
Compartment LED
Display Window
Upper Compartment
COLDER
key
WARMER
key
Lower Compartment
COLDER
key
WARMER
key
Temperature
Alarm ON/OFF
key
POWER
KEY
LIGHTS
ON/OFF
key
Lower
Compartment LED
Display Window
BASIC INPUT OPERATIONS
The following pages describe the basic input operations performed at the control panel (switching unit ON and OFF,
adjusting temperature set-point, switching lighting system ON and OFF, and enabling and disabling the tempera-
ture/door alarm feature).
POWER
All units are shipped in the OFF Mode. When electricity is supplied to the appliance, a short power up is initiated
where the temperature units of measure (°F or °C) is displayed for one second, followed by the model code for five
seconds, then all components are switched OFF and the LED displays go blank. By pressing the POWER key, elec-
tricity is allowed past the control board to the rest of the unit, indicated by the lights energizing, the cooling functions
beginning and temperatures appearing in the LED display windows. (See Figure 2-5).
SHOCK HAZARD! WHEN IN OFF MODE, AC LINE VOLTAGE IS STILL PRESENT AT CONTROL BOARD!

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Electronic Control System MODEL UW-24
MODEL UW-24
Adjusting Temperature Set-Points
To adjust set-points, press the COLDER or WARMER keys on the control panel in multiple key strokes until the
desired set-point is achieved (See Figure 2-6). One key stroke equals a one degree change. The set-point is dis-
played for three seconds after the last key stroke. After three seconds, the compartment temperature is displayed.
As the compartment temperature changes, the temperature displayed changes by no more than one degree per
minute.
NOTES: The temperature range in a wine storage compartment is 40°F to 65°F.
Lighting System ON/OFF
For the purpose of displaying a wine supply, it is possible to energize the lights 100% of the time, even when the
door is closed. To do so, press and release the LIGHTS key (See Figures 2-7). To switch back to normal lighting
operation, press and release the LIGHTS key again.
Temperature Alarm and Door Alarm ON/OFF
There is an audio/visual temperature and door alarm in the UW-24 unit that can be enabled to warn a customer of
temperatures problems or if the door was left open. To enable the alarm, press and release the ALARM key (See
Figure 2-8). If the alarm is enabled, then the alarm icon on the display is illuminated. To disable this feature, press
and release the ALARM key again, and the alarm icon is de-energized.
NOTE: If the alarm is enabled and temperature problems or door ajar are experienced, the alarm icon flashes and
the alarm will beep. There are also provisions in a UW-24 unit to allow for the alarm feature to be tied into a home’s
security alarm system.
Adjusting lower compartment set-point “colder”
Figure 2-6. Adjusting Set-Point - Press Desired COLDER or WARMER Key In Multiple Key Strokes
Figure 2-7. Lighting System ON or OFF - Press LIGHT Key
Figure 2-8. Switching Temperature/Door Alarm ON or OFF - Press ALARM Key, Bell Appears when Activated

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Figure 2-9. Initiating Temperature Units Selection Mode -
Press and Hold ALARM and POWER Keys for Five Seconds
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MODEL UW-24
MODEL UW-24 Electronic Control System
UNIQUE INPUT OPERATIONS
The following pages illustrate unique input operations performed at the control panel, namely: Temperature Units
Selection Mode, Sabbath Mode and Showroom Mode.
Temperature Units Selection Mode
The electronic control is initially set to display temperature in Fahrenheit (°F) units of measure. Units of measure
can be converted from °C to °F, and/or back again. This operation is called Temperature Units Selection.
NOTE: Temperature Units Selection must be performed within the first minute after switching the unit ON.
To convert temperature units of measure from Fahrenheit (°F) to Celsius (°C) readings, press and hold the ALARM
key and the POWER key simultaneously for five seconds, then release the keys, this will display the the current unit
of measure in the right display window (See Figure 2-9). Press and hold the ALARM key and the POWER key
simultaneously for a short period of time, and that will toggle the units of measure (See Figure 2-10).
To switch from Celsius back to Fahrenheit units of measure, press and hold the ALARM key and the POWER key
simultaneously for a short period of time.
NOTES:
•Do not press and hold the POWER key first, that simply switches the unit OFF.
•Temperature Units Selection Mode will end three seconds after the last key stroke.
Figure 2-10. Temperature Units Selection Mode Initiated, Celsius Units (°C) Displayed

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Electronic Control System MODEL UW-24
MODEL UW-24
Sabbath Mode
Sabbath Mode was incorporated into the electronic control system for observance of certain religious days. When
Sabbath Mode is initiated the lighting system along with the control panel LED displays and indicators are disabled.
To initiate Sabbath Mode, the unit must first be switched OFF using the POWER key (See Figure 2-13), then press
and hold the POWER key for 10 seconds, until the lights switch OFF and two beeps are emitted by the alarm (See
Figure 2-14). To return to normal operation, press and release the POWER key.
NOTES:
•During Sabbath Mode, the evaporator fans function when the door is open.
•During Sabbath Mode, set-points cannot be adjusted.
Figure 2-13. Switch Unit OFF First
Figure 2-14. Initiate Sabbath Mode - Press and Hold POWER Key for 10 Seconds
Hold for 10 Seconds
Showroom Mode
Showroom Mode was incorporated into the electronic control system so the appliance could be displayed in a show-
room setting. When in Showroom Mode, all cooling functions are disabled, but the lighting system remains active.
To initiate Showroom Mode, begin by switching the unit OFF using the POWER key (See Figure 2-11). Then press
and hold the upper compartment WARMER and COLDER keys, and the POWER key, then release the keys (See
Figure 2-12). The unit is now in Showroom Mode. This can be verified by checking for evaporator fan operation,
and/or compressor operation. To return the unit to normal operation, repeat the steps above.
NOTE: Always check set-points after returning unit to normal operation.
Figure 2-11. Switch Unit OFF First
Figure 2-12. Initiate Showroom Mode - Press Upper WARMER, COLDER Keys and the POWER Key

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MODEL UW-24
MODEL UW-24 Electronic Control System
Supply Power to the Lighting System
AC line voltage is supplied to the door switch. The control board senses the position of the door switch and acti-
vates the lights accordingly. If the display lighting system is activated, the control boards ignores the position of the
door switch. If Sabbath Mode is activated the control board will not activate the light system.
ELECTRIC SHOCK HAZARD. 120 VOLTS AC IS STILL PRESENT AT THE CONTROL BOARD AND LIGHT
SWITCH WHEN LIGHTS ARE DISABLED.
FUNCTION OF THE ELECTRONIC CONTROL SYSTEM
The following pages explain monitoring, regulating and controlling functions of the electronic control system. Signal
traces from the UW-24 wiring schematic are used to show current flow for the functions being explained.
ELECTRIC SHOCK HAZARD! POWER TO THE UNIT MUST BE DISCONNECTED WHENEVER SERVICING
COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR ELECTRICAL COMPONENTS. EVEN
WHEN SWITCHED OFF, AC LINE VOLTAGE IS STILL PRESENT AT THE CONTROL BOARD!
Display Average Compartment Temperatures
The temperature signals from the thermistor in each compartment is monitored by the microprocessor and shown in
the control panel LED display windows. The unit symbol next to the display window indicates which compartment
(upper or lower) the temperature is associated with. Though compartment air temperature fluctuates during normal
ON and OFF cycles of the cooling system, the “average”, or “product” temperature is shown in the LED display win-
dows (See Figure 2-15).
NOTES:
•The temperature range in a wine storage compartment is 40°F to 65°F.
•If a compartment temperature should ever exceed either the high offset or low offset (for example: when a door is
left open), the temperature displayed at the control panel will change by no more than one degree per minute.
Figure 2-15. Temperature Display
Upper
Compartment
Temp Reading
Lower
Compartment
Temp Reading
Cabinet Upper Compartment Icon
Cabinet Lower Compartment Icon

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Electronic Control System MODEL UW-24
MODEL UW-24
Control Compressor, Condenser Fan, Dual Refrigerant Valve and Evaporator Fan Motors
The control senses evaporator and compartment temperatures via thermistors; one on each evaporator, and one in
each compartment. High Offset (Cut-in) is governed by the evaporator temperatures; Low Offset (Cut-out) is gov-
erned by the compartment/zone temperatures. High Offset and Low Offset are based on the set-point.
If either evaporator temperature is at high offset (calling for cooling), power is supplied to the compressor and con-
denser fan motor, cycling them ON (See Figure 2-16).
Two relays on the control board, which are in series with one another, are used to control the dual refrigerant valve.
The first “pulse” relay controls the length of time the solenoid is energized (500ms / 30 pulses per 1/2 second). The
second “sine” relay controls the negative polarity, or positive polarity of the pulse supplied to the valve’s solenoid
(determined by which evaporator is calling for cooling, ( + ) = Upper Evaporator, ( - ) = Lower Evaporator). When an
evaporator calls for cooling, the bead inside the T-connection of the refrigerant valve is forced to one side or the
other, depending on the polarity of the pulse, supplying refrigerant to the appropriate evaporator (See Figure 2-16).
When the door is closed, the door switch is opened, the control board sense that the door switch is open and turns
off the lighting system (if display lighting is not activated). Depending on which evaporator is calling for cooling, the
corresponding evaporator fan is energized (See Figure 2-16).
NOTE: When
in Sabbath
Mode, the
evaporator
thermistors still
control cut-in,
except there is
a random 15 to
25 second
delay before
power is sup-
plied to cooling
components.
Figure 2-16. Cooling Signal Trace (Upper Evaporator at High-Offset Temperature, Calling for Cooling)
Ω
2. Temperature
above low
offset
3. Energized
5. Energized
1. High offset tem-
perature detected,
calling for cooling
4. AC pulse,
(+ polarity)
supplied to
solenoid,
valve
opens sup-
plying
refrigerant
to upper
evaporator

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MODEL UW-24
MODEL UW-24 Electronic Control System
Monitor and Control Off-cycle Defrost
With High Offset (Cut-in) being governed by evaporator temperatures, the refrigeration system will remain off until at
least one evaporator temperatures exceeds set-point by one degree. With a set-point of 40°F, the high-offset would
be 41°F; With a set-point of 65°F, the high-offset would be 66°F. This method allows the evaporators to fully defrost
before cooling is initiated (See Figure 2-17).
Figure 2-17. Off-cycle Defrost Signal Trace
Ω
No cooling called for
Refrigeration system not energized; evaporators defrost

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Electronic Control System MODEL UW-24
MODEL UW-24
POSSIBLE ERROR/FAULT INDICATORS
All wine storage units are equipped with an audio-visual temperature alarm feature, as well as low voltage wiring
provisions to allow the alarm to be tied into a home security alarm system. This section explains the temperature
alarm feature and the audio and/or visual error indicators that may alert a customer of a malfunction.
NOTE: If the temperature alarm feature is tied into a home security system, the connections are made using the
security system’s logic. If problems occur between the wine storage unit and the security system, then a home
security system technician should be contacted.
Warm Temperature Alarm
A warm temperature alarm can occur if either wine storage compartment remains warm for too long, causing several
consecutive maximum run-time cycles. A warm temperature alarm situation will cause the SERVICE icon to flash
(See Figure 2-18), and an appropriate error code to be logged; power to the compressor and condenser fan is also
cut. If the temperature alarm feature has been enabled by pressing the ALARM key on the control panel, the alarm
icon will also flash, and the audible alarm will beep. (See Figure 2-19)
NOTE: To clear the warm temperature alarm, the problem must be corrected, then press the POWER key to switch
the unit Off, then press it again to switch the unit back ON. (See Figure 2-20) Also see Clearing Error Codes, later
in this section.
Figure 2-18. Warm Temperature Alarm, Service Icon Flashing
Figure 2-19. Warm Temperature Alarm with Alarm Feature Enabled:
Service and Alarm Icons Flashing with Audible Alarm Beeping
BEEP! BEEP! BEEP!
Figure 2-20. Clear Warm Temperature Alarm - Press POWER Key to Off, Then again to ON
(Also see Clearing Error Codes, later in this section.)

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MODEL UW-24
MODEL UW-24 Electronic Control System
Figure 2-21. Cold Temperature Alarm, SERVICE Flashing
Figure 2-22. Cold Temperature Alarm with ALARM Feature Enabled,
SERVICE and ALARM Flashing with Audible Alarm Beeping
BEEP! BEEP! BEEP!
Figure 2-23. Clear Cold Temperature Alarm, Press POWER Key to Off, Then ON
Cold Temperature Alarm
A cold temperature alarm can occur if either wine storage compartment remains below 40°F too long, in conjunction
with several consecutive maximum run-time cycles. A cold temperature alarm situation will cause the SERVICE indi-
cator to flash (See Figure 2-21), and an appropriate error code to be logged; power to the compressor and condens-
er fan is also cut. If the temperature alarm feature has been enabled by pressing the ALARM on the control panel,
the ALARM indicator will also flash, and the audible alarm will beep. (See Figure 2-22)
NOTE: To clear the cold temperature alarm, the problem must be corrected, then press the POWER key to switch
the unit OFF, then press it again to switch the unit back ON. (See Figure 2-23) Also see Clearing Error Codes, later
in this section.

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Electronic Control System MODEL UW-24
MODEL UW-24
Thermistor Malfunction Error/Fault Indicators
The diagrams below illustrating what a customer may see on the display if there is a thermistor fault, such as a short
circuit or open circuit condition (See Figures 2-24, 2-25, 2-26). A thermistor fault will cause power to the compres-
sor and fans to be cut, and appropriate error codes will be logged. If the temperature alarm feature has been
enabled by pressing the ALARM key on the control panel, the ALARM icon will also flash, and the audible alarm will
beep.
NOTE: Correcting/repairing the thermistor problem will clear the Thermistor Malfunction Fault Indicator.
Figure 2-24. “EE” at Right and Service Icon Flashing = Upper Compartment Thermistor (or its Wiring) Fault
(NOTE: Alarm will Beep and Alarm Icon will also Flash if Alarm is Enabled)
Figure 2-25. “EE” at Left and Service Icon Flashing = Lower Compartment Thermistor (or its Wiring) Fault
(NOTE: Alarm will Beep and Alarm Icon will also Flash if Alarm is Enabled)
Figure 2-26. Service Icon Alone Flashing = An Evaporator Thermistor (or its Wiring) Fault
(NOTE: Alarm will Beep and Alarm Icon will also Flash if Alarm is Enabled)

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MODEL UW-24
MODEL UW-24 Electronic Control System
TROUBLESHOOTING INPUT OPERATIONS
The following pages explain troubleshooting input operations performed at the control panel, namely: Diagnostic
Mode, Manual Valve Activation Mode and Temperature Log Recall Mode.
Diagnostic Mode
Initiating Diagnostic Mode allows the Service Technician to observe real-time temperature readings from all thermis-
tors without temperature averaging. If errors were registered by the thermistors or the defrost system, “Error Codes”
will also be displayed during diagnostic mode.
To initiate Diagnostic Mode, the unit must be ON, then press and hold either COLDER key, and press the POWER
key, then release both keys (See Figure 2-27). If no error codes have been logged, the left display area will show
real-time temperature of the thermistor, the right display area will show the thermistor location code, and all indica-
tors will illuminate. Pressing either COLDER key while in Diagnostic Mode will toggle to the next thermistor location.
(See Figure 2-28, 2-29 and 2-30)
NOTES:
•If COLDER and POWER keys are pressed and held for 10 seconds, Manual Valve Activation Mode will be initiat-
ed.
•Diagnostic Mode will end three seconds after the last key stroke.
Figure 2-27. Initiate Diagnostic Mode - Press and Hold Either COLDER Key, Then the POWER Key
(“UE” = Upper Evaporator)
Figure 2-28. Toggle Through Temperature Readings - Press Either COLDER Key
(“LE” = Lower Evaporator)
Figure 2-29. Toggle Through Temperature Readings - Press Either COLDER Key
(“UP” = Upper Compartment)
Figure 2-30. Toggle Through Temperature Readings - Press Either COLDER Key
(“LO” = Lower Compartment)

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Electronic Control System MODEL UW-24
MODEL UW-24
Diagnostic Mode Alerts
“EE” observed in the left display window during Diagnostic Mode - The thermistor, or its wiring in the location
indicated by the code at right is open or shorted (See Figure 2-31).
Figure 2-31. “EE” Observed in Diagnostic Mode = Thermistor (or its wiring) Fault in Location Indicated
“EC” observed in the right display window during Diagnostic Mode - Numbers at left are “Error Codes” (See
Figure 2-32). Error Codes indicate problems logged by specific components. If error codes are logged, they will
appear before temperature readings and can be toggled through with the temperature readings as described on the
previous page. (See Error Code Table below.)
Figure 2-32. Numbers at Left with “EC” at Right = Error Code (See Error Code Table Below)
Wine Storage Error Code Table
CODE INDICATION
05 Upper Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
06 Upper Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
07 Lower Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
08 Lower Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
10 Upper Cabinet Warm Temperature alarm
11 Upper Cabinet Cold Temperature alarm
12 Lower Cabinet Warm Temperature alarm
13 Lower Cabinet Cold Temperature alarm
15 Sealed System Fault (evap temperature cannot drop 5° in 5 minutes, 3 consecutive valve activations)
Clearing Error Codes
If error codes are observed, a non-flashing service icon will appear on the display when Diagnostic Mode ends, indi-
cating error codes are still logged. To clear the error codes and non-flashing service icon, the problem must be cor-
rected, then with the unit ON, press and hold the ALARM key for 15 seconds. The control will emit a short “beep”
when the error codes is cleared and the service icon will de-energize. (See Figure 2-34)
Figure 2-33. Clear Error Code & Non-flashing Service Icon - Press & Hold ALARM Key for 15 Seconds
Press and hold for 15 seconds

Page 20
2-17 #7040748 - Revision A - September, 2016
MODEL UW-24
MODEL UW-24 Electronic Control System
Manual Valve Activation Mode
Manual Valve Activation Mode forces the refrigerant valve to feed refrigerant to the desired evaporator, while ener-
gizing the appropriate evaporator fan motor along with the compressor and condenser. Once initiated, the mode
lasts for five minutes, during which time the chosen evaporator’s temperature is displayed on the control panel.
Along with allowing the real time evaporator temperatures to be observed, this mode allows for the activated compo-
nents to be physically inspected for proper operation and electrically tested.
To initiate Manual Valve Activation Mode, the unit must be ON, then press and hold the desired compartment COLD-
ER key and POWER key for 10 seconds; the evaporator temperature will then be displayed in the left display win-
dow, the right display window will show the thermistor location code and the appropriate cabinet compartment icon
will be illuminated. (See Figure 2-34).
NOTES:
• If the COLDER and POWER keys are pressed and held for less then 10 seconds, Diagnostic Mode will be initiat-
ed.
• It is possible to toggle through the other temperature readings, as in Diagnostic Mode, but in this case the tem-
perature readings will last for five minutes rather than seconds.
• The compressor overload could prevent the compressor from energizing.
• Manual Valve Activation Mode will end five minutes after initiated. It is possible to end this five minute run time
and return to normal operation by switching the unit OFF then back ON. If this is done, note that the electronic
control will observe a three minute minimum compressor OFF time when the unit is switched back ON. This is to
protect the compressor and its electricals.
Figure 2-34. Initiating Refrigerant Valve Activation Mode - Press and Hold Desired COLDER Key and
POWER Key for 10 Seconds
Press and hold for 10 seconds
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