Miele DG 408 Series Manual

TECHNICAL INFORMATION
DG 408x Steam Ovens
© 2012 Miele USA

Technical Information
2
DG 408x Steam Ovens
Table of Contents
AWarning and Safety Instructions.............................................................................5
BModification History .................................................................................................5
CTechnical Data ..........................................................................................................5
DComponent Layouts .................................................................................................7
1Appliance Overviews ..................................................................................................7
2Electrical Components ................................................................................................ 9
010Casing......................................................................................................................11
1Technical Data.......................................................................................................... 12
2Function .................................................................................................................... 12
2.1Air and Vapor Ducting............................................................................................ 12
2.2 Fan Coastdown...................................................................................................... 13
2.3Door Contact Switch (S24) .................................................................................... 13
2.4Release Element (Y56) for Steam Reduction ....................................................... 13
3Fault Repair ..............................................................................................................14
3.1Fan Coastdown Too Long ..................................................................................... 14
3.2 Top Clearance Too Small When Combined with Warming Drawer (DG 4080) .... 14
4 Service......................................................................................................................15
4.1 Removing the Appliance from its Niche................................................................. 15
4.2 Removing the Side Panels .................................................................................... 15
4.3Rear Panel Removal.............................................................................................. 16
4.4Fan (M2/1) Removal .............................................................................................. 17
4.5Removing the Door Contact Switch (S24)............................................................. 18
4.6 Upper Air Duct Removal........................................................................................ 18
4.7 Fan Wheel Removal .............................................................................................. 20
020Door .........................................................................................................................21
3 Fault Repair ..............................................................................................................22
3.1Whistling Sound When Closing the Door .............................................................. 22
4 Service......................................................................................................................22
4.1 Door Removal........................................................................................................ 22
4.2 Installing the Door.................................................................................................. 23
4.3 Door Disassembly.................................................................................................. 23
030Oven Cavity ............................................................................................................. 24
1Technical Data.......................................................................................................... 25
2 Function .................................................................................................................... 25
2.1Floor Heater Element............................................................................................. 25
2.2PT 1000 Temperature Sensor (R30 or R30/10) .................................................... 25
4 Service......................................................................................................................25
4.1PT 1000 Temperature Sensor (R30 or R30/10) Removal..................................... 25
4.2Removing the Floor Heater Element (R28) ........................................................... 26
4.3 Floor Heater Temperature Regulator (2F1) and Temperature Limiter (2F8)
Removal................................................................................................................. 28
040 Water Tank ..............................................................................................................29
1 Technical Data.......................................................................................................... 30
2 Function .................................................................................................................... 30
2.1Steam Generation.................................................................................................. 30
3 Fault Repair ..............................................................................................................31
3.1 Appliance Does Not Heat ...................................................................................... 31
3.2 Appliance Heats Too Slowly.................................................................................. 31

Technical Information
3
DG 408x Steam Ovens
3.3 Appliance Generates Strong Steam at First Use, or After a Power Outage/Reset32
3.4 Appliance Appears to be Incorrectly Installed ....................................................... 32
3.5 Steam Generator is Discolored ............................................................................. 32
4 Service......................................................................................................................33
4.1Checking the Resistance of the Steam Generator Heater (1R25, 2R25) ............. 33
4.2Removing the Steam Generator Heater (1R25, 2R25) ......................................... 34
4.3 Removing the Steam Generator Temperature Regulator (1F1) and Temperature
Limiter (1F8) .......................................................................................................... 34
4.4Removing the Steam Duct and Seal ..................................................................... 35
4.5 Accessing the Tank Float/Float Switch Actuating Magnet (DG 4080 Only).......... 36
4.6Removing the Reed Contact Float (PCB) (S12).................................................... 36
4.7Removing the Steam Generator Present Switch (S84)......................................... 37
4.8 Removing the Steam Generator Socket................................................................ 37
060Fascia, Electronics ................................................................................................. 38
2 Function .................................................................................................................... 39
2.1 Optical Interface..................................................................................................... 39
2.2Electronics Overview ............................................................................................. 40
2.3 Warming Function.................................................................................................. 41
2.4 Power Management............................................................................................... 41
2.5 Descaling ............................................................................................................... 41
3 Fault Repair ..............................................................................................................42
3.1 Fault Code Summary............................................................................................. 42
3.2 F05 - Short Circuit in PT 1000 Temperature Sensor............................................. 42
3.3 F06 - Open Circuit in PT 1000 Temperature Sensor............................................. 42
3.4 F20 - Heating Fault ................................................................................................ 42
3.5 F44 - Control Electronic/Power Electronic Interface is Faulty ............................... 44
3.6 Displays Look Different.......................................................................................... 44
3.7 Wrong Language Setting....................................................................................... 44
3.8 Display Dims.......................................................................................................... 44
3.9 Time of Day Shown in 12-Hour Format/24-Hour Format ...................................... 44
3.10 Cooking Program Does Not Start .......................................................................... 45
3.11 Excessive Steam in the Oven Cavity..................................................................... 45
3.12 Cooked Food Is Not Kept Warm............................................................................ 45
3.13 Recommended Temperatures Are Changed ........................................................ 45
3.14 Display Is Hard To Read........................................................................................ 45
3.15 Buzzer at the End of a Cooking Cycle is Too Loud/Soft/Short.............................. 45
3.16 When Touching a Keypad, Tone is Too Loud or Too Soft .................................... 46
3.17 System Lock Is Possible/Not Possible .................................................................. 46
3.18 Temperature in °C / °F........................................................................................... 46
4 Service......................................................................................................................46
4.1 Programming Mode ............................................................................................... 46
4.2 Service Mode......................................................................................................... 49
4.3Removing the Fascia Panel Assembly .................................................................. 51
4.4Removing the Control Electronic (DG 4082) ......................................................... 53
4.5Removing the Selection Electronic........................................................................ 53
070Technical Service Bulletins ................................................................................... 54
1DG 4080 Steam Oven Displays F20 in a New Installation ........................................ 54
List of Figures
Figure D-1: Overview of DG 4080 (Front View) ......................................................................7
Figure D-2: Overview of DG 4082 (Front View) ......................................................................8
Figure D-3: DG 4080 Electrical Components ..........................................................................9
Figure D-4: DG 4082 Electrical Components ........................................................................10

Technical Information
4
DG 408x Steam Ovens
Figure 010-1: Ducting............................................................................................................12
Figure 010-2: Screws on the Bottom of the Appliance (DG 4080) ........................................ 15
Figure 010-3: Appliance Retaining Screws ...........................................................................15
Figure 010-4: Side Panel Screws (DG 4082 Shown) ............................................................16
Figure 010-5: Rear Panel Screws .........................................................................................16
Figure 010-6: Fan Screws and C-Clip ................................................................................... 17
Figure 010-7: Fan Connections............................................................................................. 17
Figure 010-8: Door Contact Switch Removal ........................................................................18
Figure 010-9 Fascia Fastening Screws.................................................................................19
Figure 010-10: Upper Air Duct Retaining Screws and Hose ................................................. 19
Figure 010-11: Silicone Seal .................................................................................................20
Figure 010-12: Front Lugs..................................................................................................... 20
Figure 020-1: Hinge Clamps ................................................................................................. 22
Figure 020-2: Door Removal.................................................................................................22
Figure 020-3: Door Handle Removal.....................................................................................23
Figure 030-1: Temperature Sensor R30 Removal (DG 4080)............................................... 26
Figure 030-2: Temperature Sensor R30/10 Removal (DG 4082).......................................... 26
Figure 030-3: Floor Heater Cover .........................................................................................27
Figure 030-4: Floor Heater Removal (DG 4080) ................................................................... 27
Figure 030-5: Floor Heater Removal (DG 4082) ................................................................... 28
Figure 040-1: Steam Generator ............................................................................................30
Figure 040-2: Hose Clamp .................................................................................................... 32
Figure 040-3: Steam Generator Heater Contacts .................................................................33
Figure 040-4: Housing Base .................................................................................................34
Figure 040-5: Steam Generator Temperature Regulator and Temperature Limiter ..............35
Figure 040-6: Steam Duct Retaining Screws ........................................................................35
Figure 040-7: Removing the Top Cover from the Steam Duct Assembly..............................36
Figure 040-8: Reed Contact Float ......................................................................................... 37
Figure 040-9: Steam Generator Present Switch ...................................................................37
Figure 060-1 Optical Interface...............................................................................................39
Figure 060-2: EPL700 Electronic – Overview (DG 4080 Shown).......................................... 40
Figure 060-3: AC Power Electrical Circuit (DG 4080) ...........................................................41
Figure 060-4: Fascia Panel Assembly (DG 4080)................................................................. 51
Figure 060-5: Control Electronic Screws (DG 4080) ............................................................. 52
Figure 060-6: Fascia Panel (DG 4082) ................................................................................. 52
Figure 060-7: Removing the Control Electronic (DG 4082)...................................................53
List of Tables
Table C-1: US Data Sheet ......................................................................................................6 
Table 010-1: Cooling Fan Data ............................................................................................. 12
Table 030-1: Floor Heater Data ............................................................................................ 25
Table 030-2: PT 1000 Temperature Sensor Resistance Values ........................................... 25
Table 030-3: Threshold Temperatures..................................................................................25
Table 040-1: Steam Generator Data ..................................................................................... 30
Table 060-1: Fault Codes...................................................................................................... 42
Table 060-2: Programming Mode ......................................................................................... 49
Table 060-3: Service Mode ................................................................................................... 50

Technical Information
5
DG 408x Steam Ovens
A Warning and Safety Instructions
Service may only be carried out by qualified electricians and in keeping
with the appropriate safety regulations.
All applicable guidelines, accident prevention rules and laws must be
observed.
Before service or repair work can be started, all cables carrying power
must be safely disconnected.
Even when the appliance is disconnected from power, elements may
carry voltage.
A general visual check must be performed at all times.
A touch current measurement must be conducted on all conductive parts
that are not connected to ground.
Wear protective gloves and use the edge protection (mat. no. 5057680) to
prevent cuts by sharp edges.
B Modification History
When? Who? What?
2/2/2012 Jessica Naples Tech service bulletins added
5/27/2010 Jessica Naples Compilation for Website
C Technical Data
Figure C-1: DG 408x

Technical Information
6
DG 408x Steam Ovens
Model
DG 4080 DG 4082
Design Steam oven Steam oven
Construction Built-in Built-in
Door stop Bottom Bottom
Dimensions
Appliance dimensions H x W x D 18.0” x 23.4” x 18.2” 17.9” x 23.6” x 16.7”
Depth with door open 30.8“ 30.8“
Niche dimensions
Height 17.6” – 17.8” 17.7”
Width 22.0” – 22.4” 22.0” – 22.4”
Depth min. 19.7” min. 19.7”
Weight 59.4 lbs 61.8 lbs
Capacity 0.88 cu. ft. 0.88 cu. ft.
Cavity height 9.4” 9.5”
Cavity base dimensions W x D 13.2” x 14.4” 13.2” x 14.4”
Levels in cavity (for racks) 4 (incl. 1 for condensate tray)
Equipment
Vapor cooling system X
Water supply hookup —
System lock during operation X
Oven cavity floor heater X
Automatic steam reduction X
Recipe book X
Water tank capacity 1.3L
Operational
f
eatures
Standard text display X
Recessed controls X
Temperature control 104 – 212°F
Automatic shutoff X
Fault indication X
Door contact switch X
Programmable cooking time X
Use of residual energy X
Steady water level indicator X
Warming function X
Operating modes
Cooking levels 4
Heat X
Defrost X
Descale X
Automatic programs X
Own favorites X
Interference suppressed X
Heaters
Floor heater 300W 350W
Steam generator 2200W 2200W
Power connection
Voltage (208) 240 VAC 240VAC
Frequency 60Hz 60Hz
Electrical connection NEMA 6-15 NEMA 6-15
Connected load 2500W 2700W
Fuse (circuit breaker) rating 15A 15A
Table C-1: US Data Sheet

Technical Information
7
DG 408x Steam Ovens
D Component Layouts
1 Appliance Overviews
Figure D-1: Overview of DG 4080 (Front View)
1 Door release
2 Control panel
3 Air vent
4 Door seal
5 Steam channel
6 Steam generator (with insert)
7 Steam generator compartment
8 Steam generator electrical connection
9 Runners (4)
10 Steam port
11 Drip channel
12 Floor heater
13 Temperature sensor
14 Vent port

Technical Information
8
DG 408x Steam Ovens
Figure D-2: Overview of DG 4082 (Front View)
1 Control panel
2 Door release
3 Air vent
4 Door seal
5 Steam channel
6 Steam generator compartment
7 Steam generator (with insert)
8 Steam generator electrical connection
9 Runners
10 Steam port
11 Drip channel
12 Floor heater
13 Temperature sensor
14 Air vent

Technical Information
9
DG 408x Steam Ovens
2 Electrical Components
Figure D-3: DG 4080 Electrical Components
1 (2F1, 2F8) Floor heater temperature regulator (239°F) and
temperature limiter (402°F)
2 (S4) Door contact switch
3 (R28) Floor heater
4 (1N1) Selection electronic EW
5 (2N1) Control electronic EPX
6 (3N1) Power electronic EPL
–
(1K1/1, 2K1/1) Steam generator relay (not shown)
–
(K1/3) Floor heater relay (not shown)
–
(K1/5) Fan relay (not shown)
–
(K1/61) Release element relay (not shown)
7 (Z2) Interference suppression capacitor
8 (Y56) Release element
9 (X2) Socket for power cable
10 (X7) Plug strip
11 (R30) PT1000 temperature sensor
12 (M2) Fan
13 (S12) Water level float switch (PCB)
14 (S84) Steam generator present switch
15 (1R25, 2R25) Steam generator heater elements
16 (1F1, 1F8) Steam generator temperature regulator (410°F)
and temperature limiter (568°F)

Technical Information
10
DG 408x Steam Ovens
Figure D-4: DG 4082 Electrical Components
1 (2F1, 2F8) Floor heater temperature regulator (239°F) and
temperature limiter (402°F)
2 (R28) Floor heater
3 (S4) Door contact switch
4 (2N1) Control/selection electronic EW
5 (R30/10) PT1000 temperature sensor
6 (1N1) Power electronic
7 (X2) Power socket
8 (Z2) Interference suppression capacitor
9 (Y56) Release element
10 (X7) Plug strip
11 (M2/1) Cooling fan
12 (S84) Steam generator switch
13 (S12) Water level float switch (PCB)
14 (1R25, 2R25) Steam generator heater
15 (1F1, 1F8) Steam generator temperature regulator (410°F)
and temperature limiter (568°F)

Technical Information
11
DG 408x Steam Ovens
010 Casing
DG 4080 DG 4082

Technical Information
12
DG 408x Steam Ovens
1 Technical Data
Cooling fan M2 (DG 4080) or M2/1 (DG 4082)
Voltage 240VAC, 60Hz
Output 15W
Table 010-1: Cooling Fan Data
2 Function
2.1 Air and Vapor Ducting
Figure 010-1: Ducting
1 Steam inlet
2 Oven vent hose
3 Cool air/vapor outlet
4 Cool air inlet
5 Release element for steam reduction (door opener)
6 Steam vent hose
During the cooking process, fresh steam is pumped into the oven cavity
(Figure 010-1, Item 1). The generated vapors are pushed out through the
vent opening. Through a hose at the rear of the oven cavity, the vapors move

Technical Information
13
DG 408x Steam Ovens
to the air duct (Figure 010-1, Item 2). The fan draws in cool air through the air
vents in the housing, and the cool air mixes with the vapors in the air duct
(Figure 010-1, Item 4). The cool air/vapor mix is expelled through the gap
between the fascia and the oven cavity (Figure 010-1, Item 3). Excess steam
from the steam generator is carried directly to the fan via the vent hose
(Figure 010-1, Item 6) and pushed out at the front of the appliance. Shortly
before cooking time is up, relay K1/61 activates the release element, which
causes a metal rod to slowly open the door a crack. This reduces the steam
in the oven cavity. See Figure 010-1, Item 5. Once the buzzer sounds to
indicate the end of cooking time, the door slowly closes.
2.2 Fan Coastdown
To reduce the vapors that are still in the oven cavity after cooking has ended,
the fan continues running after the appliance is switched off.
This prevents
steam from settling on the fascia of the cabinetry when opening the door
condensate from forming in the housing by residual steam.
Coastdown duration depends on whether or not the steam generator has
been removed from the appliance after the cooking process. Warm cooked
food in the appliance delays the cooling and leads to a longer coastdown
time. Coastdown time is not adjustable!
If steam generator was removed: Coastdown takes at least 8 minutes. If
after the first 8 minutes the interior temperature has not dropped below
113°F (45°C), then the coastdown time is extended for an additional 8
minutes until the interior temperature drops below 113°F (45°C).
If steam generator was not removed: Coastdown takes at least 60
minutes. If after the first 60 minutes the interior temperature has not
dropped below 113°F (45°C), then the cooldown time is extended for an
additional 8 minutes until the interior temperature drops below 113°F
(45°C).
2.3 Door Contact Switch (S24)
If the door is opened during the cooking process, the door contact switch
signals the control electronic, which switches off the steam generator heater
(1R25, 2R25).
Note:
With the door open a crack, new cooking selections can be made.
However, the steam generator heater will not be switched on for
approximately one to two minutes.
2.4 Release Element (Y56) for Steam Reduction
Shortly before cooking time is up, relay K1/61 activates the release element,
which slowly opens the door a crack. This reduces the steam in the oven
cavity. After the buzzer sounds to signal the end of cooking time, the door
slowly closes again.
While the door is open a crack, new cooking selections can be made.
However, the steam generator heater will not be switched on for
approximately one to two minutes.

Technical Information
14
DG 408x Steam Ovens
3 Fault Repair
3.1 Fan Coastdown Too Long
Symptom:
Coastdown is at least 8 minutes and can be more than 60 minutes.
Cause:
Steam generator remains in the appliance after cooking has ended.
Coastdown duration depends on whether or not the steam generator has
been removed from the appliance after the cooking process. Warm cooked
food in the appliance delays the cooling and leads to a longer coastdown.
Coastdown time is not adjustable!
Steam generator was removed: Coastdown takes at least 8 minutes. If
after the first 8 minutes the interior temperature has not reduced to below
113°F (45°C), then the coastdown is extended for an additional 8 minutes
until the interior temperature drops below 113°F (45°C).
Steam generator was not removed: Coastdown takes at least 60
minutes. If after 60 minutes the oven cavity temperature has not dropped
below 45°C, the coastdown duration is extended in increments of 8
minutes until the oven cavity temperature is below 45°C. In addition, if
food remains in the oven cavity, the cooling-off period is delayed and
causes a longer coastdown.
Remedy:
1. Remove steam generator and cooked food after a cooking program.
2. Leave door open.
3. Empty steam generator before inserting it again.
3.2 Top Clearance Too Small When Combined with Warming Drawer (DG 4080)
Symptom:
When combining the appliance with the built-in EGW 4000 warming drawer,
the clearance on top to the cabinetry is too small. This becomes particularly
obvious if other Miele machines are built in next to it.
Cause:
Two screw heads at the bottom of the appliance meet exactly with rivets at
the top of the EGW 4000 warming drawer. This causes the appliance to be
positioned slightly higher, and the gap within the cabinetry to be insufficient to
allow proper installation.
Series modification:
The position of the rivets on the warming drawer has been changed so that
the screw caps will not meet the rivets.
Remedy:
Note:
Both screws can be permanently removed, since they are only used during
production and will not have any adverse effects if removed.
Remove both screws (Figure 010-2, Item 1).

Technical Information
15
DG 408x Steam Ovens
Figure 010-2: Screws on the Bottom of the Appliance (DG 4080)
4 Service
4.1 Removing the Appliance from its Niche
1. Open the door.
2. Take the steam generator and equipment out of the oven cavity.
3. Remove the appliance retaining screws (Figure 010-3, Item 1).
4. Slide the appliance out of its niche.
5. Disconnect the appliance from the power supply.
Figure 010-3: Appliance Retaining Screws
4.2 Removing the Side Panels
1. Uninstall the appliance. See Section 010-4.1.
2. Remove the side panel screws; see Figure 010-4, Item 1.
3. Take off the side panel(s).

Technical Information
16
DG 408x Steam Ovens
Figure 010-4: Side Panel Screws (DG 4082 Shown)
4.3 Rear Panel Removal
1. Uninstall the appliance. See Section 010-4.1.
2. Remove the T20 screws securing the rear panel (Figure 010-5, Item 1).
3. Remove the rear panel.
Figure 010-5: Rear Panel Screws

Technical Information
17
DG 408x Steam Ovens
4.4 Fan (M2/1) Removal
1. Uninstall the appliance. See Section 010-4.1.
2. Remove the right side panel. See Section 010-4.2.
3. Remove the screws securing the fan (Figure 010-6, Item 1).
4. Remove the C-clip securing the blower wheel (Figure 010-6, Item 2).
5. Turn the blower wheel as necessary to permit access to the motor
mounting screws.
Figure 010-6: Fan Screws and C-Clip
6. Disconnect hoses (Figure 010-7, Item 1) as necessary to access the fan
motor from the underside of the air duct.
7. Raise the air duct slightly (Figure 010-7, Item 2) and take out the fan
motor (Figure 010-7, Item 3).
8. Disconnect all fan connections.
Figure 010-7: Fan Connections

Technical Information
18
DG 408x Steam Ovens
4.5 Removing the Door Contact Switch (S24)
1. Uninstall the appliance. See Section 010-4.1.
2. Remove the left side panel. See Section 010-4.2.
3. Unhook the door spring (Figure 010-8, Item 1).
4. Remove the two Phillips screws (Figure 010-8, Item 2).
5. Remove the switch from its support plate.
6. Disconnect the switch connections (Figure 010-8, Item 3).
Figure 010-8: Door Contact Switch Removal
4.6 Upper Air Duct Removal
1. Take the steam generator and equipment out of the oven cavity.
2. Uninstall the appliance. See Section 010-4.1.
3. Remove the side panels. See Section 010-4.2.
4. Remove the rear panel. See Section 010-4.3.
5. Remove four screws securing fascia panel (Figure 010-9, Item 1, left and
right sides).

Technical Information
19
DG 408x Steam Ovens
Figure 010-9 Fascia Fastening Screws
6. Remove the fascia/support panel assembly.
7. Disconnect plug ST3 from the electronic, and remove wiring from the top
of the ducting.
8. Remove 17 screws (Figure 010-10, Item 1).
9. Disconnect the hose (Figure 010-10, Item 2).
Figure 010-10: Upper Air Duct Retaining Screws and Hose
10. Using an appropriate tool, slice open the silicone seal (Figure 010-11, Item 1).

Technical Information
20
DG 408x Steam Ovens
Figure 010-11: Silicone Seal
11. Slide the upper duct assembly back to release the front lugs from the
frame (Figure 010-12). Lift the assembly upward to remove.
Figure 010-12: Front Lugs
Warning!
When re-installing the upper air duct, the silicone has to be replaced to seal
the air duct.
The front lugs on the upper air duct are fragile and break off easily!
4.7 Fan Wheel Removal
1. Take the steam generator and equipment out of the oven cavity.
2. Uninstall the appliance. See Section 010-4.1.
3. Remove the side panels. See Section 010-4.2.
4. Remove the rear panel. See Section 010-4.3.
5. Remove the upper air duct; see Section 010-4.6.
6. Remove the C-clip (Figure 010-6, Item 2).
7. Remove the fan wheel.