Cove DW2450 User manual

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828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
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ErrorCodesandTroubleshooting
SERVICE MODE
Service mode allows a technician to review various user
settings/offsets, manually activate and deactivate
components, and monitor the unit's performance including
logged errors. In Service mode:
Bluetooth pairing PIN messaging, Wi-Fi control via
the Sub-Zero Group Owner’s App, error detection
and management, and diverter valve movement are
allowed.
Pressure-based drain pump control is active.
Standby Power mode, Smart Grid requests, wash
cycles, or monitoring of any analog I/O are not
allowed.
When the sump fills, it always fills to the volume of
"Main Wash #1" in the NORMAL wash cycle.
Service mode may be activated from the UIM panel, or via
the RS-485 connection using the Connected Diagnostics
program.
Service mode exits after 5 minutes with no input.
ENTER SERVICE MODE
Touch and hold Auto and Heavy for 5 seconds or
more.
Release Heavy, and continue to hold Auto for 5
seconds.
"Service Mode:" appears on the UIM.
SERVICE MODE FUNCTIONS
Service mode allows two main functions:
Use the Cancel key to scroll through the error codes.
Manually turn on and turn off components and
systems to confirm operation. Pressing a UIM key
turns on the corresponding component or system;
pressing the key again turns it off. Only one
component or system can be turned on at a time.
UIM KEY FUNCTIONS IN SERVICE MODE
UIM KEY CONTROL DISPLAY
Auto Toggles drain pump ON/OFF
(up to 50 secs. max. ON time). MOT4 (Drain pump motor)
Normal Toggles water inlet valve ON/
OFF. SOL1 (Water inlet valve)
Heavy Toggles wash pump ON/OFF. MOT1 (Wash pump
motor)
Quick Toggles heater ON/OFF (up to
70º C). HTR1 (Tub heating element)
Cycles+ Sets diverter valve position (at
each key press, diverter valve
changes its position). The door
must be shut for 15-45 seconds
to show a position change on
the UIM.
MOT2 (Diverter valve
motor), SV =
requested position,
PV = current position
(0 = Home, 1 =
Middle/Upper, 2 = All,
3 = Lower)
Options Toggles drying fan ON/OFF. MOT3 (Drying fan
motor)
Enter Toggles water softener
regeneration valve ON/OFF (if
applicable).
SOL2 (Water
softener regeneration
valve)
Cancel Toggles through any and all
stored error codes.
Also, touch and hold to exit
Service mode.
Error log table
Start Toggles dispenser coil ON/OFF
(300 ms ON, then OFF is the
only action).
SOL3 (Dispenser
coil)
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828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
FAULT-LEVEL ERROR CODES
Fault-level errors involve safety concerns, or indicate that
the dishwasher is inoperable. Only repairing the actual
fault will cancel a fault-level error. It will continue to appear
in the unit's error code list until the fault is repaired.
When a fault-level error occurs:
Any active functions, such as active wash cycles or
UIM navigation, are exited.
No user control of the unit is allowed, either by the
UIM interaction or by the Sub-Zero Group Owner's
App.
There may be an indication that a service call is
required via a UIM message and tone or in the Sub-
Zero Group Owner's App.
WARNING-LEVEL ERROR CODES
Warning-level errors are not safety-related or catastrophic.
They indicate that improper functionality of the unit may
occur, such as poor wash performance. A warning-level
error can be canceled in Service mode, but the error may
reappear if the condition that caused the error still exists.
When a warning-level error occurs:
The unit stays operable by the user, either by direct
UIM interaction or by the Sub-Zero Group Owner's
App.
An indication of the error may appear on the UIM
when the door is open.
CLEAR ALL ERROR CODES
From the UIM, exit Service mode (touch and hold the
Cancel key).
Use the User Setup menu's "Reset All" function.
TIP: It is also possible to clear all error codes by
clearing the error log table in the Connected
Diagnostics Program.
CLEAR INDIVIDUAL ERROR CODES
From the UIM:
Enter Service mode.
Touch the Cancel key to scroll through any error
codes.
Warning-level error codes will be cleared upon
each touch.
Fault-level error codes need to be repaired first.
Some error codes automatically clear
when they are repaired.
Some error codes require cycling power
to the unit.
Some error codes require using "Reset
All" in the User Options menu.
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
828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
DW2450 AND DW2450WS ERROR CODE TABLE
ERROR CODE TABLE
IMPORTANT NOTE: The table's error codes contain links to Answer Advisor articles. Click the error code number in
the table for the most up-to-date information about the error code.
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
050100 Fault MCM did not detect current
from MOT1 Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Replace the MCM assembly.
050103 Fault MCM incorrectly converted
current from MOT1 Replace the MCM assembly.
050104 Fault MCM damaged after MOT1
current exceeded 2.54 A Replace the MCM assembly.
050113 Fault MOT1 operated with open
phase (0 A) for 10 s Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Replace the MCM assembly.
050116 Fault MOT1 overloaded from
dishwasher environment Use Connected Diagnostics Program to monitor wash pump current for multiple
starts and stops of the wash pump motor during a wash cycle.
Check for a blockage inside the wash pump.
Test for proper operation with a Rinse/Hold cycle.
050117 Warning Input voltage under 190 V. If possible, check the quality of power delivered to the unit, including poor power
connection or damage to the power cord.
Test for proper operation with a Rinse/Hold cycle.
Replace the MCM assembly.
050118 Warning Input voltage over 400 V Replace the MCM assembly.
050119 Fault MCM incorrectly converted
thermistor input from AE1 Replace the MCM assembly.
050123 Warning MOT1 overloaded from
dishwasher environment and
MCM reached 212°F (100°C)
Let the unit cool down and test for proper operation with a Rinse/Hold cycle.
Replace the wash pump motor.
Replace the MCM assembly.
050124 Warning Input voltage loss of 50 V within
100 ms If possible, check quality of power delivered to the unit, including poor power
connection or damage to the power cord.
Test for proper operation with a Rinse/Hold cycle.
Replace the MCM assembly.
050126 Fault MCM read input voltage as 0 V
for 2 s Replace the MCM assembly.
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
828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
050127 Warning MCM potentially damaged after
MOT1 current exceeded 2.54 A Replace the MCM assembly.
050135 Fault MOT1 overloaded from
dishwasher environment and
cycling MOT1 to max speed for
10 consecutive trials failed.
Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Use Connected Diagnostics Program to monitor wash pump current for multiple
start/stops of the wash pump motor during a wash cycle.
Check for a blockage inside the wash pump.
Test for proper operation using a Rinse/Hold cycle.
050136 Warning MOT1 overloaded from
dishwasher environment with
current over 800 mA
Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Use Connected Diagnostics Program to monitor the wash pump current for the
wash pump motor amperage exceeding 800 mA during a wash cycle.
Check for a blockage inside the wash pump.
Test for proper operation using a Rinse/Hold cycle.
050138 Fault No communication between
MCM and MOT1 for 30 s Replace the MCM assembly.
050139 Fault MOT1 overloaded from
dishwasher environment and
reached 284°F (140°C) for 2
consecutive trials
Let the unit cool down and test for proper operation with a Rinse/Hold cycle.
Check for a blockage inside the wash pump.
Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Replace the MCM assembly.
050140 Fault MCM detected an overcurrent
condition during MOT1 steady
speeds for 10 consecutive trials
Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Replace the wash pump motor.
Replace the MCM assembly.
050144 Warning MOT1 overloaded from
dishwasher environment and
reached 284°F (140°C)
Let the unit cool down and test for proper operation with a Rinse/Hold cycle.
Check for a blockage inside the wash pump.
Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Replace the MCM assembly.
050180 Warning MOT1 did not receive speed set
point from the MCM in 80 ms Replace the MCM assembly.
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
828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
050186 Fault Water flow problem Verify the water supply is on.
Verify there are no kinks in the water supply line.
050187 Fault Water flow problem Verify the water supply is on.
Verify there are no kinks in the water supply line.
050199 Fault MCM did not detect MOT1 stop
command for 10 seconds while
PWM stopped, or MCM
detected a fault while inverter
powered
Confirm the wash pump wire harness connections are tight and continuity of the
circuit, including across connector PJ26.
Measure the resistance of all three phases of the wash pump (60.0 Ω± 3.0 Ω).
Replace the MCM assembly.
100147 Fault MCM did not detect voltage
within valid limits from AE1 for
300 s
Confirm the temperature and turbidity sensor wire harness connections are tight
and continuity of the circuit, including across connector PJ9.
Measure the resistance of the temperature and turbidity sensor across pin 4 & 1
(10 KΩ± 1%).
200128 Fault HTR1 exceeded 176°F (80°C)
for 60 s Disconnect the power cord.
Check there is NO continuity from the tub heater element to ground.
TIP: The heater and TCO connectors have a special locking feature.
To remove, press the tab in before pulling them off the terminals.
Confirm there is continuity across the front thermal cutout.
Check that there is NO continuity from the tub heater element wire harness to
ground, including across connector PJ23.
Verify X4 is properly connected to the MCM and its contacts are clean and intact.
Check that there is NO continuity across the heating relay for X4 on the MCM.
Replace the MCM assembly.
200129 Fault HTR1 did not increase by 5°F
(3°C) during any 10 second
period during heated segment
of wash cycle.
Measure the resistance of the tub heating element (16 Ω+10% / -5% @70°F -
80°F).
TIP: The heater and TCO connectors have a special locking feature.
To remove, press the tab in before pulling them off the terminals.
Confirm the tub heater element wire harness connections are tight and continuity
of the circuit, including across both connector PJ23 and PJ33.
Verify X4 is properly connected to the MCM and its contacts are clean and intact.
Verify all insulation completely encases the tub, and none is torn, missing, wet, or
defective.
Replace the MCM assembly.
200142 Fault HTR1 did not turn off after the
door was open for 10 s Check the mechanical operation of the door latch switch.
Confirm door latch switch wire harness circuit continuity.
TIP: The continuity should change as the door latches and
unlatches.
Replace the UIM.
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
828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
Replace the MCM assembly.
200193 Fault HTR1 did not turn off after 234
minutes Disconnect the power cord.
Replace the MCM assembly.
250113 Warning
or Fault FE1 detected a leak while SOL1 is off and no active wash
cycle
Use Diagnostic Mode to flush the sump fill valve 5 times anddrain. Repeat.
Test for proper operation with a Rinse/Hold cycle.
Check the water inlet valve assembly for debris or other contaminants.
Replace the water inlet valve assembly.
250115 Warning
or Fault FE1 detected a leak while SOL1 is off and 3 recovery
SOL1 flush sequences failed
Use Diagnostic Mode to flush the sump fill valve 5 times anddrain. Repeat.
Test for proper operation with a Rinse/Hold cycle.
Use Connected Diagnostics Program to monitor fill valve state and water used.
TIP: The fill valve flowmeter should read 0 when the sump fill valve
is OFF.
Check the water inlet valve assembly for debris or other contaminants.
Replace the water inlet valve assembly.
Replace the MCM assembly.
300114 Fault Sump filtration system requires
cleaning Clean both the sumpfilterscreen and fine filter.
IMPORTANT NOTE: Use extreme caution so debris does not enter
the hydraulics. If that happens, clean and flush the hydraulics.
300137 Fault FLT1 read open (0) for 30
seconds Check for the source of the leak and repair.
Check that the base float switch is not stuck in the upward position.
Confirm the base float switch wire harness connections are tight andcontinuity of
thecircuit, including across connector PJ14.
Verify X16 is connected to the MCM and its contacts are clean and intact.
Replace the MCM assembly.
550147 Fault MCM did not receive valid
signal from AE1 for 60 s Confirm temperature and turbidity sensor wire harness connections are tight and
circuit continuity, including across pins 4 and 2 and pins 4 and 3 of connector
PJ9.
Confirm there is continuity across both pins 4 and 2 and pins 4 and 3 of the
temperature and turbidity sensor.
Verify X20 is connected to the MCM and its contacts are clean and intact.
Replace the MCM assembly.
550196 Fault AE1 unable to calibrate Clean the pylons of the temperature and turbidity sensor.
IMPORTANT NOTE: Do not misplace the O-ring.
Use Connected Diagnostics Program to monitor the continuous temperature and
turbidity value during either a Normal or Auto wash cycle.
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828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
TIP: Turbidity should change throughout the wash cycle as soil
enters the sump.
Replace the temperature and turbidity sensor.
560186 Fault FE1 detected insufficient water
supply to the dishwasher while
SOL1 on
Check the water supply valve to the unit. Verify there are no kinks in the water
supply line and the water supply valve is fully open.
Confirm the house water pressure is 30 - 140 psi. If not, contact the local water
utility provider.
Use diagnostic mode to test for proper operation of the sump fill valve.
Use Connected Diagnostics Program to monitor the fill valve state and water
used during the Pre-Rinse segment of a Rinse Hold wash cycle.
TIP: The fill valve flowmeter should read 937-1036 pulse counts (1.1
gal water).
Confirm the fill valve flowmeter wire harness connections are tight and continuity
of the circuit, including across connector PJ10.
Verify X19 is connected to the MCM andits contacts are clean and intact.
560187 Fault FE1 detected no water supply
to the dishwasher while SOL1
is on
Check the water supply valve to the unit. Verify there are no kinks in the water
supply line and the water supply valve is fully open.
Confirm the house water pressure is 30 - 140 psi. If not, contact the local water
utility provider.
Use diagnostic mode to activate the sump fill valve.
Use Connected Diagnostics Program to monitor the fill valve state and water
used during the Pre-Rinse segment of a Rinse Hold wash cycle.
TIP: The fill valve flowmeter should read 937-1036 pulse counts (1.1
gal water).
Confirm the fill valve flowmeter wire harness connections are tight and continuity
of the circuit, including across connector PJ10.
Verify X19 is connected to the MCM and its contacts are clean and intact.
570114 Fault Low salt in water regeneration
tank Add salt. Follow the UIM messages.
Go into the User Setup menu, and look for the Water Hardness option. If that
option does not appear, proceed to step 5.
Confirm the water softener float switch wire harness connections are tight and
continuity of the circuit, including across connector PJ10.
Verify X18 is properly connected to the MCM and its contacts are clean and
intact.
Use the Connected Diagnostics Program to verify the model type ends in "WS".
Replace the water softener tank.
570154 Fault Low rinse aid Add rinse aid. Follow the UIM messages.
Confirm the Rinse Aid Level Sensor wire harness connections are tight and
continuity of the circuit, including across connector PJ1.
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828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
Verify X201 is connected to the UIM and its contacts are clean and intact.
580147 Fault MCM did not receive valid
signal from PE1 for 60 s Confirm sump pressure sensor wire harness connections are tight and continuity
of the circuit, including across pins 2 and 1 and pins 2 and 3 of connector PJ11.
Confirm there is continuity across both pins 2 and 1 and pins 2 and 3 of the sump
pressure sensor.
Verify X20 is connected to the MCM and its contacts are clean and intact.
Replace the MCM assembly.
600148 Fault ZE1 did not read diverter disc Insert a manual door switch activator to replicate a closed-door scenario.
Use diagnostic mode to test for proper operation of the diverter valve.
Confirm the diverter valve motor and position sensor wire harness connections
are tight and continuity of the circuit, including across connectors PJ12 and PJ27.
Verify X14 and X31 are connected to the MCM and contacts are clean and intact.
Replace the diverter valve.
Replace the MCM assembly.
600149 Fault MOT2 on for 60 s while not
calibrating Replace the diverter valve.
Verify X14 and X31 are connected to the MCM and contacts are clean and intact.
Replace the MCM assembly.
600151 Fault ZE1 read rotation of diverter
disc in 35 s Replace the diverter valve.
Verify X14 and X31 are connected to the MCM and contacts are clean and intact.
Replace the MCM assembly.
700160 Fault PE1 detected underfill condition
while no active wash cycle Check thedrainrouting from the unit. Verify there are no kinks in thedrainhose
and thedrainline high loop remains attached to the rear of the dishwasher.
Clean both the sumpfilterscreen and fine filter.
IMPORTANT NOTE: Use extreme caution so debris does not enter
the hydraulics. If that happens, clean and flush the hydraulics.
Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
700165 Fault PE1 detected underfill condition
while no active wash cycle Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
700166 Fault PE1 detected overfill condition
that could not be resolved while
no active wash cycle
Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
700180 Fault PE1 detected underfill condition
while no active wash cycle Check thedrainrouting from the unit. Verify there are no kinks in thedrainhose
and thedrainline high loop remains attached to the rear of the dishwasher.
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
828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
Clean both the sumpfilterscreen and fine filter.
NOTE: Use extreme caution so debris does not enter the
hydraulics. If that happens, clean and flush the hydraulics.
Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
700181 Fault PE1 detected underfill condition
that could not be resolved while
no active wash cycle
Check thedrainrouting from the unit. Verify there are no kinks in thedrainhose
and thedrainline high loop remains attached to the rear of the dishwasher.
Clean both the sumpfilterscreen and fine filter.
NOTE: Use extreme caution so debris does not enter the
hydraulics. If that happens, clean and flush the hydraulics.
Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
700195 Fault PE1 detected overfill condition
while no active wash cycle Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
700197 Fault Pressure sensor detected an
overfill condition that could not
be resolved while no active
wash cycle
Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
800140 Fault MOT4 on for 300 s and
watchdog timer timed out Use Connected Diagnostics Program to monitordraining during a Rinse/Hold
cycle.
TIP: Drain pump motor operation should NOT occur in intervals
over 80 seconds.
Check thedrainrouting from the unit. Verify there are no kinks in the drain hose
and the drain line high loop remains attached to the rear of the dishwasher.
Clean both the sumpfilterscreen and fine filter.
NOTE: Use extreme caution so debris does not enter the
hydraulics. If that happens, clean and flush the hydraulics.
Check that the base float switch is not stuck in the upward position.
Replace the draincheck valve.
Confirm the drain pump wire harness connections are tight and continuity of the
circuit, including across connector PJ30.
Verify X7 is connected to the MCM and its contacts are clean and intact.
Confirm there is continuity across the drain pump.
Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
800186 Fault MOT4 unable to calibrate
during initial drain segment of
wash cycle
Use Connected Diagnostics Program to monitordraining during a Rinse/Hold
cycle.
TIP: Drain pump motor operation should NOT occur in intervals
over 80 seconds.
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828019 REV B 08/2023
DW2450 and DW2450WS Service Manual
service.subzero.com 800.222.7820
Error Codes and Troubleshooting
ERROR
CODE ERROR LEVEL ERROR DESCRIPTION DIAGNOSING/TROUBLESHOOTING
Check the drain routing from the unit. Verify there are no kinks in the drain hose
and the drain line high loop remains attached to the rear of the dishwasher.
Clean both the sumpfilterscreen and fine filter.
NOTE: Use extreme caution so debris does not enter the
hydraulics. If that happens, clean and flush the hydraulics.
Check that the base float switch is not stuck in the upward position.
Replace the drain check valve.
Confirm the drain pump wire harness connections are tight and continuity of the
circuit, including across connector PJ30.
Verify X7 is connected to the MCM and its contacts are clean and intact.
Confirm there is continuity across the drain pump.
Test for proper operation with a Rinse/Hold cycle.
Replace the pressure sensor.
900107 Fault 485 and MCM firmware
incompatible Use Connected Diagnostics Program to load the latest software for the MCM and
UIM in the following order: MCM RS485, MCM Main, UIM SW, and LCD Mem
SW.
900112 Fault UIM secondary and MCM
firmware incompatible. Use Connected Diagnostics Program to load the latest software for the MCM and
UIM in the following order: MCM RS485, MCM Main, UIM SW, and LCD Mem
SW.
900122 Fault UIM primary and MCM firmware
incompatible Use Connected Diagnostics Program to load the latest software for the MCM and
UIM in the following order: MCM RS485, MCM Main, UIM SW, and LCD Mem
SW.
900131 Fault Invalid or non-existent
development block/
configuration image within
MCM
Use Connected Diagnostics Program to load the latest software for the MCM and
UIM in the following order: MCM RS485, MCM Main, UIM SW, and LCD Mem
SW.
900132 Fault Motor control and MCM
firmware incompatible Use Connected Diagnostics Program to load the latest software for the MCM and
UIM in the following order: MCM RS485, MCM Main, UIM SW, and LCD Mem
SW.
900153 Fault UIM primary and MCM firmware
incompatible Use Connected Diagnostics Program to load the latest software for the MCM and
UIM in the following order: MCM RS485, MCM Main, UIM SW, and LCD Mem
SW.
900182 Fault No communication between
MCM and UIM Confirm the UIM wire harness connections are tight and continuity of the circuit,
including across pin 8 and 1-7 of connector PJ17 and pin 9 and 2-8 of connector
PJ11.
Verify X25 is connected to the MCM and its contacts are clean and intact.
Replace the MCM assembly.
980199 Fault Input power interruption during
active wash cycle If possible, check the quality of power delivered to the unit, including poor power
connection or damage to the power cord.
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