Cove DW2450 User manual

SERVICE MANUAL INTRODUCTION
This service manual helps with troubleshooting and diagnosing
malfunctions, completion of repairs, and return of the product to
proper operating condition. Read the complete instructions
contained within before initiating any repairs.
This guide is intended for use by Factory Certified Service.
Cove Appliance, Inc. recommends that only Factory Certified
Service companies do repairs.
Warning and Caution product safety labels appear throughout
this manual. Product safety labels appear at the beginning of
some sections. Follow the instructions in the product safety
labels to avoid personal injury and/or product damage. The
sample safety labels explain the types of notices that appear in
this manual.
WARNING
States a hazard that may cause serious injury or
death if precautions are not followed.
CAUTION
Indicates minor injury or product damage may occur
if precautions are not followed.
IMPORTANT NOTE: Highlights especially important information.
TIP: Indicates additional, useful information.
Information and images contained herein are copyright of Cove
Appliance, 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 Cove Appliance,
Inc. ©Cove Appliance, Inc., all rights reserved.
COVE PRODUCT RATING PLATE INFORMATION
The product rating information is located inside the dishwasher
tub on the left-hand side.
Important information for each product is listed on the product
rating plate. Rating plates identify:
▪Model name and part number
▪Electrical and power specifications
▪Serial number
MODEL DESCRIPTIONS AND SALES ACCESSORIES
For more details on individual model descriptions and a listing
of all compatible sales accessories, see the
Cove Distributor
Price List .
COVE DISHWASHER MODEL KEY
Model Character Description
DW Dishwasher
24 Width in Inches
50 Feature Set Indicator
WS Water Softener
PRODUCT USE AND CARE AND INSTALLATION GUIDES
Product use and care guides, installation guides, and other
product specifications are available in the
Product
Specifications and Manuals Library .
UNIT WARRANTY
Product warranty is determined by the installation location and
the date of installation.
▪View product warranties at
http://service.subzero.com/
ClaimsAndOrderProcessing/Pages/WarrantyInfo .
▪Warranties start on the day of product installation.
▪Search for warranty and service information by serial
number, customer last name, and address using Unit
History at
http://service.subzero.com/Tools/UnitHistory .
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General Information
GENERAL INFORMATION
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COVE DISHWASHER THEORY OF OPERATION
Wash Cycles
The Cove dishwasher has four wash cycles, Auto, Normal,
Heavy, and Quick, available as keys on the dishwasher's user
interface module (UIM). Additional cycles for specific needs (for
example, energy-saving cycles or gentle cycles for china and
crystal) are available by touching the Cycles+ key.
Once the wash cycle is selected, additional options for the
wash cycle (for example, delaying the start time or adding an
anti-bacterial high-temperature rinse) are available by touching
the Options key. To begin the wash cycle, touch the Start key
and close the door.
In each wash cycle:
1The unit fills to a preset volume.
2The unit heats and circulates water throughout the tub
interior with a preset water temperature and circulation
speed.
3The unit may change which racks receive spray water/
detergent. Each wash cycle has its own preset spray arm
pattern.
4The unit does a preset number of fills and drains to remove
the soils from the dishes.
5The unit rinses the dishes with a preset rinse sequence.
6The unit then dries the dishes with a preset drying
sequence.
Each wash cycle has its own preset water volumes,
temperatures, spray arm patterns, and rinse/drying operations.
Status Light
The status light illuminates to indicate the status of the cycle.
LIGHT STATUS
Blue
A delayed start has been selected. Touch
Start each time the door is opened prior to
the start time.
Red The cycle has started.
Green The cycle is complete.
No Light
The door was not closed within four
seconds after touching Start, the cycle has
been complete for more than two hours, or
the door has been opened.
Water Softener
For water softener models only, a salt compartment is located
at the bottom of the interior.
When softener salt is low, “Add Salt. ENTER once added,
CANCEL to ignore.” appears on the display.
Diverter Valve
The diverter valve helps control water flow depending on the
selected wash cycle.
The diverter valve manages water flow between the lower,
middle, and upper wash arms. It uses a high-torque motor to
drive a disc valve via a gear box. A proximity sensor sends
information on the disc position to the MCM. The diverter valve
distributes water from the wash pump to the upper/middle and
lower spray arms at different pressures. In select cycles, it
alternates pressure between the arms to deliver a "soak and
scrub" action.
▪When it diverts water to the upper/middle and lower arms
separately, the unit also adjusts the wash pump RPMs to
help maintain the pressure.
▪Quick and Rinse & Hold cycles do not divert water. All other
cycles use the diverter valve.
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CONTROLS AND OPERATION
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Inlet Valve
When the inlet valve (SOL1) is operated manually in Service
mode, it cannot fill the unit to the point that water overflows out
of the unit. The water level is monitored by the pressure sensor.
When the pressure sensor reaches a predetermined value, the
MCM turns on the drain pump.
UIM and Tub Light Behavior
UIM lighting and tub lighting operation are synchronized.
▪When the UIM lighting turns on, the rate that the UIM lights
increase their brightness matches the rate that the tub lights
increase their brightness so that both lighting systems
match.
▪When the door is closed, the tub lights instantly turn off.
▪When the door is opened, the tub lights slowly increase
their brightness to 100% output level in 3 seconds.
▪If the door is left open at an angle for 10 minutes, the tub
lights dim slowly to a 20% output level. Then, if the user
leaves the door open at any angle for another 5 minutes,
the tub lights turn off. If the door moves during this 15-
minute period, the tub lighting dimming sequence starts
over.
When Standby Power mode automatically turns on, all lighting
dims as above.
Dishwasher lighting control does not affect or control lighting on
the Sub-Zero Group Owner's App.
Temperature and Turbidity Sensor
The temperature and turbidity sensor (AE1) is a combination
sensor.
▪The temperature sensor portion is an integrated NTC
thermistor. The temperature sensor will sense incoming
water temperature as soon as the level of water in the sump
rises to cover it.
▪The turbidity sensor portion uses infrared light to measure
opacity of a liquid. It is located in the sump to measure how
dirty the water is. This helps to determine the rate of
cleaning of the load.
The dishwasher's UIM has no means to show temperature or
turbidity. Monitoring either of these requires the Connected
Diagnostics Program.
WASH CYCLES AND USER CONTROL
The dishwasher's menu is arranged as a multi-level tree with
pre-assigned UIM keys to navigate up/down and left/right. It
also has pre-assigned UIM keys to either select or disregard a
value anywhere within the menu.
Auto Cycle
The Auto cycle uses the turbidity of the water and its change
over time to decide the duration and intensity.
Auto starts with a prewash cycle, during which the unit drains
and fills to 1.1 gal. The unit then washes and takes turbidity
readings once per minute, calculating the average turbidity and
the change in the average turbidity as time passes. The unit
washes and accumulates turbidity data for 10 minutes (up to 15
minutes if the turbidity is not stable). Then, it selects a cycle
based on the average turbidity:
▪Very Light (~2:07, 4 gal, crumbs, juice/wine/beer glasses
very light loads).
▪Light (~2:30, 5.1 gal, cereal bowls, milk glasses, wine/beer
glasses, mashed potatoes, meat juices).
▪Average (~2:55, 6.2 gal, tomato juice, fried eggs, cream
corn, jams/jellies, tomato sauces).
▪Heavy (~3:25, 7.3 gal, oatmeal/hot cereals, scalloped
potatoes, dried egg yolk, peanut butter, creamed corn).
▪Very Heavy (~3:55, 8.4 gal, dried/baked on starchy
foods, dried on milk products, oven pans used for roasting
meats, casserole foods).
Normal Cycle
The Normal cycle uses the turbidity of the water and its change
over time to decide the duration and intensity.
Normal starts with a pre-wash cycle, during which the unit
drains and fills to 1.1 gal. The unit then washes and takes
turbidity readings once per minute, calculating the average
turbidity and the change in the average turbidity as time passes.
If the turbidity is stable after about 13 minutes or if the unit has
been washing for more than 20 minutes with varying turbidity
behavior, the unit chooses the Light or Average setting based
on the average turbidity level. However, if the turbidity is
consistently low (indicating dirty water) after the first fill/wash/
drain, the unit chooses the Heavy setting.
▪Light (~2:40, 3.0-8.3 gal, cold cereal bowls, milk glasses,
wine/beer glasses, meat juices)
▪Average (~2:40, ~5.0 gal, tomato juice, fried eggs, cream
corn, jams/jellies, tomato sauces, starches)
▪Heavy (~2:40, 5.3-8.3 gal, oatmeal/hot cereals, scalloped
potatoes, dried egg yolk, peanut butter, creamed corn)
Note: Within the Heavy setting, the unit chooses one of two
sets of fills and drains depending on the turbidity (five total
fills and drains if the turbidity improves or eight total fills and
drains if the turbidity remains low).
Set a Wash Cycle
1Touch the desired wash cycle, or touch Cycles+ multiple
times to scroll to the desired wash cycle.
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2Touch Start and close the door within four seconds.
TIP: To incorporate a cycle option to the wash cycle, touch
Options before touching Start. Refer to Set Cycle Options on
page 4. To change the cycle after touching Start, touch
Cancel.
Set Cycle Options
Cycle options add certain features to cycles to meet specific
wash needs.
1Select the desired wash cycle.
2Touch Options.
3Touch Options multiple times to scroll through cycle
options.
4Touch Enter to select the desired option. Then, continue to
touch Enter until the desired setting appears in the display.
5Touch Options again to select additional options.
6Touch Start and close the door within four seconds.
Cycle Options
OPTION DESCRIPTION
Delay Start Delays start of wash cycle by 1–12 hours
in 1-hour increments.
High Temp
Wash
Increases the main wash water
temperature and extends the cycle time
by 10 minutes.
Sani Rinse* Increases the rinse water temperature
and extends the rinse time.
Extended Dry Extends the dry time by 30 minutes.
Extra Dry Increases the rinse water temperature
and extends the dry time by 30 minutes.
Top Racks
Only
Directs wash functions to upper and
middle racks only.
*Sanitizes per NSFIANSI standard 184 for residential
dishwashers.
Interrupt a Cycle
To interrupt a cycle:
1Open the door.
2To restart the cycle, touch Start and close the door within 4
seconds.
Cancel a Cycle
To cancel a cycle:
1Open the door.
2Touch Cancel and follow the instructions on the display.
Set User Options
1Touch Cancel twice.
2Touch and hold Options for approximately 10 seconds until
"User Set Up" appears on the display.
3Touch Options multiple times to scroll to the desired option.
4Touch Enter to scroll or to select the desired setting.
5Touch Cancel to exit user setup.
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SET A WASH CYCLE (continued)
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MODES
Modes are the dishwasher's operational states, in which the dishwasher varies its behavior according to instructions from the following:
▪User input from the UIM
▪Connected appliance communications from a tablet or other connected device
▪Smart Grid
Mode Description
Power-Up mode The unit is first turned on.
User mode The unit is used for day-to-day, ordinary operation.
Standby Power mode The unit enters a low-power state after a specified period of
inactivity.
Sabbath mode The unit is set up by the user for certain religious observances.
Child Lock mode The unit's UIM is locked to prevent unwanted operation.
Showroom mode The unit is set up by sales staff for demonstration purposes.
Service Diagnostic mode Activated by Service personnel in the user's residence. See
Service Mode on page 47.
Power-Up Mode
Power-Up mode is the control system's initial power-up/boot sequence, when the unit first connects to AC power. In Power-Up mode, all
power supplies and all electronics initialize their associated circuitry and components.
Power-Up mode does not have water softener regeneration messaging, Bluetooth PIN messaging, diverter valve movement, or lighting.
Digital Wi-Fi connection X13’s ON/OFF state is OFF until after the boot sequence, when the software will set it to either OFF or ON.
If the unit does not successfully pass though Power-Up mode, the UIM shows "PF - Call Service."
User Mode
User mode is the normal, day-to-day operation mode of the dishwasher. This mode does not require any key press combinations to enter
or exit, but the unit's control system may enter and exit User mode automatically, for example entering Standby Power mode after a
period of inactivity.
User mode allows all control system functions including Smart Grid requests, Bluetooth pairing, water softener regeneration messaging,
diverter valve movement, pressure-based drain pump control, and the digital Wi-Fi connection X13.
Standby Power Mode
During periods of inactivity, the unit can automatically enter a Standby Power mode in which it consumes no more than 0.5 W of power.
Standby Power mode occurs when the unit has either:
▪Had no door movement and no communication and has not logged any errors for 15 minutes.
▪Completed its wash cycle with the door still latched shut.
In Standby Power mode, the UIM is blank, and all control system outputs are disabled including tub lighting, water softener regeneration
messaging, and diverter valve movement. Pressure-based drain pump control is allowed. If the pressure goes above its range, the unit
will exit Standby Power mode to communicate the error.
Standby Power mode is exited by moving the door, pressing any UIM key, receiving a Bluetooth pairing PIN display command, or
triggering an error.
Standby Power mode never occurs when the unit's Connect? option is turned on.
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Controls and Operation
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