Blomberg BWOS 30100 User manual

BWOS 30100 SERVICE MANUAL
1
CONTENTS
1.
SERVICING REQUIREMENTS
1.1
HEALTH & SAFETY
1.1.1
Electrical Safety
1.1.2
Good Working Practices
1.1.3
Insulation Test
1.1.4
Sheet Metal Edges
1.2
SPECIAL TOOLS & MATERIALS
1.2.1
Tools
1.2.2
Materials
2.
TECHNICAL OVERVIEW
2.1
OVEN SPECIFICATIONS
2.1.1
Oven Weight
2.1.2
Power Rating
2.2
SERIAL PLATE
2.2.1
Location
2.2.2
Model and Serial Number
2.3
COMPONENT SPECIFICATIONS
2.3.1
Heating Elements
2.3.2
Motors
2.3.3
Electric Components
2.4
SYSTEM DESCRIPTION
2.5
OVEN MODEL CONFIGURATION
2.6
MANUAL TEST
2.6.1
How to Verify the Correct Selection
2.6.2
How to Check Single Oven Hardware
2.6.3
Power Supply 208v Voltage Selection
2.7
DESCRIPTION OF ELECTRONIC CONTROL

BWOS 30100 SERVICE MANUAL
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3.
USER MANUAL
3.1
CONTROL PANEL
3.1.1
Command Keys
3.1.2
Display
3.1.3
Knobs
3.2
OVEN MODES
3.3
GENERAL OVEN INFORMATION
3.3.1
Flashing Symbols or Numbers
3.3.2
Beeps
3.3.3
Fast Preheat
3.3.4
Lock Symbol
3.3.5
Safety Door Lock
3.3.6
Power Failure
3.3.7
Default Settings
3.3.8
F Failure Number Codes
3.3.9
Convection Fan
3.3.10
Component Cooling Fan
3.4
SETTING THE CLOCK AND TIMER
3.4.1
To Set the Clock
3.4.2
To Set the Timer
3.5
SELECTING THE OVEN MODE
2.8
FAULT NUMBERS
2.9
OVEN SAFETY FUTURES
2.9.1
Child –Safe Locking System
2.9.2
Over Heating sensor
2.9.3
Thermostat
2.9.4
Double –Speed Thermostat
2.9.5
Safety Thermostat

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3.5.1
Convection Cavity Sequence
3.5.2
Temperature Selector
3.5.3
Using Oven Light
3.6
TIME OVEN MODE OPERATION
3.6.1
To Set Time Mode
3.6.2
To Delay the Start of a Timed Mode
3.7
SPECIAL FEATURE FUNCTION
3.8
SABBATH MODE INSTRUCTION
3.9
SETTING THE SELF-CLEANING
3.9.1
To set the Self Clean Mode
3.9.2
To change the Clean Time
3.9.3
To Delay the Start of Clean
3.10
OVEN DOOR REMOVAL
3.10.1
To Remove Door
3.10.2
To Replace Door
3.11
REPLACING AN OVEN LIGHT
4.
TROUBLE SHOOTING GUIDE
4.1
ERROR MESSAGE
4.2
OVEN NOT OPERATIVE
4.3
COOLING FAN PROBLEMS
4.4
CONVECTION FAN PROBLEMS
4.5
DOOR LOCK PROBLEMS
4.6
OVEN LIGHT PROBLEMS
4.7
SELECTORS PROBLEMS
4.8
DISPLAY PROBLEMS
4.9
DOOR HINGES PROBLEMS
4.10
BAD COOKING PERFORMANCE

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5.
ELECTRIC DIAGRAM
5,1
SINGLE OVEN - MULTIFUNCTION
6.
EXPLODED PARTS
6.1
SINGLE OVEN 30”
7.
COMPONENT REPLACEMENT AND ADJUSTMENT
PROCEDURE
7.1
OVEN REMOVAL
7.2
COOLING FAN MOTOR SUBSTITUTION
7.3
---
7.4
CONVECTION FAN MOTOR SUBSTITUTION
7.5
RING ELEMENT SUBSTITUTION
7.6
UPPER ELEMENT SUBSTITUTION
7.7
LOWER ELEMENT SUBSTITUTION
7.8
LOCK DOOR MOTOR SUBSTITUTION
7.9
LOCK DOOR MOTOR SWITCH SUBSTITUTION SOLUTION
7.10
LOOK DOOR SWITCH SUBSTITUTION
7.11
DOOR GASKET SUBSTITUTION
7.12
RESISTOR 78Ω SUBSTITUTION
7.13
SAFETY THERMOSTATS SUBSTITUTION
7.14
PROBE TEMPERATURE SUBSTITUTION
7.15
DOOR HINGES SUBSTITUTION
7.16
DOOR HINGES BOX SUBSTITUTION
7.17
POWER BOARD SUBSTITUTION
7.18
TEMPERATURE OR FUNCTION SELECTORS
7.19
DISPLAY BOARD SUBSTITUTION
7.20
DOOR EXTERNAL GLASS SUBSTITUTION

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7.21
DOOR INTERNAL GLASS SUBSTITUTION
1.
SERVICING REQUIREMENTS
1.1
HEALTH & SAFETY
Note: When servicing the BLOMBERG oven, health and safety issues must be considered at
all times. Specific safety issues are listed below with their appropriate icon. These are
illustrated throughout the service information to remind service people of the health and
safety issues
1.1.1
Electrical Safety
WARNING! TO AVOID ELECTRIC SHOCK!
Do not attempt to service this oven without suitable training
and qualifications.
Ensure the main power has been disconnected before servicing any
part of the oven. If the power is required to be on for electrical fault
finding, then extreme care should be taken not to make contact with
electrical components other than with testing probes.
Ensure the oven is turned off when removing any electrical component
or connection.
1.1.2
Good Working Practices
Ensure the work areas are kept tidy and free of hazards while servicing
the oven. On completion of the servicing, ensure the oven and work
areas are left clean and tidy.
1.1.3
Insulation Test
Megger test to check insulation.
1.1.4
Sheet Metal Edges
When working around cut sheet metal edges use appropriate gloves or
protection to eliminate the chance of receiving a laceration.
1.2
SPECIAL TOOLS & MATERIALS
1.2.1 Tools
1.2.2 Materials
7.5V Power
Screw/Nut
Driver
Recommen
ded
3” socket
extension
bar
Ceramic spacers
Ceramic fiber gasket for upper element
Ceramic fiber gasket for ring element
Nylon spacers for display board

BWOS 30100 SERVICE MANUAL
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7mm
socket
10 mm
socket
12mm
socket
Flexible
shaft
socket
extension
#1 and #2
Short
Phillips
Screw
driver
Digital
power
meter
(Voltage –
Current)
Static strap
2.
TECHNICAL OVERVIEW
2.1
OVEN SPECIFICATIONS
2.1.1
Oven Weight
Single 30”
lbs /Kg =148/67
2.1.2
Power rating
TECHNICAL DATA
OVENS
Electrical Ratings and Maximum Connected Load
@ 240 Volts 60Hz
@ 208 Volts 60Hz
Dimension
TYPE
Amperes
Watts
Amperes
Watts
BWOS
30100
30"
(76cm)
PIRO
15,6
3625
17,4
3529

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2.2.1
Location
The product serial number plate is located on the left side profile trim
2.2.2
Model & Serial Number
The numbers printed on the plate contains the following information:
2.3.1
Heating
Elements
Volts
Freq.
Watts
Note
Piro 30”
Broil
240
--
3500
Bottom
240
--
3000
Ring
240
--
2500
Additional
208
--
775
2.3.2
Motors
Volts
Freq.
Watts
Note
Convection Fan
120
60
45
Cooling Fan
120
60
40
Door Lock Motor
100/120
50/60
3
2.3.3
Electric
Components
Volts
A
Watts
Note
Door Lock Motor Switch
250
16
--
Lamp
120
--
25
Door Lock Switch
250
16
--
Cooling Fan Resistor
--
--
--
78Ω
Safety Thermostat
250
16
--
Cooling Fan Thermostat
250
16
--
Probe Temperature
5V
--
--
2.2
SERIAL PLATE
2.3
COMPONENT SPECIFICATIONS

BWOS 30100 SERVICE MANUAL
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ELECTRONIC CONTROL. The control consists of a main power board and a display board. An
additional power board is derived from the main one removing the power supply parts. It has all
the functions of the main one to drive the lower cavity in a double oven. The main power board
provides the voltages to the other boards (GND, -5V and -24V for the relays to the lower power
board only).
The three boards share a I2C communication bus (Data and Clock).
COOKING MODE & TEMPERATURE SELECTORS. All ovens have one selector for the cooking
modes and one for the set temperature, per every cavity. The cooking mode selector has 4
positions for thermal cavities, 9 for multifunction ones.
TEMPERATURE SENSOR. There is one Pt1000 sensor per every oven (two in a double, of
course), fixed on the rear wall outside the cavity.
HEATING ELEMENTS. Four heaters are available in multifunction ovens while the ring element is
missing in the thermal ones. They are combined together in different ways, depending on the
selected mode, but the maximum power never overtakes 3500W.
DESCRIPTION
30” & 27”
24”
UPPER ELEMENT
3500W at 240V
3000W at 240V
LOWER ELEMENT
3000W at 240V
2100W at 240V
RING ELEMENT
2500W at 240V
2500W at 240V
UPPER EXTERNAL
ADDITIONAL ELEMENT
775W at 208V (meaning
1032W at 240V).
NOT AVIABLE
CONVECTION FAN. This fan is available in multifunction cavities; it works always at the same
speed in all convection modes, self-clean and dehydrate.
COOLING FAN SYSTEM. A cooling fan keeps the internal parts temperature within acceptable
values, and removes smoke from the cavity through the catalyser. A resistor connected in series
reduces the voltage on the fan motor and consequently the fan speed. There is a 70°C by-pass
thermostat that shorts this resistor when the temperature overtakes the threshold, switching the
cooling fan into its full speed. This normally occurs during self-clean only.
OVEN LIGHTS. Halogen is 120V. They turn on when a cooking mode starts or when the door is
open. It’s also possible to switch the lights on manually by pressing the light button.
DOOR LATCH SYSTEM. A motor actuates the latch mechanism to lock or unlock the door. The
motor always rotates in the same direction, and it’s the mechanism that determines the locking or
unlocking phases. They take about the same time to complete the half cycle. The door micro
switch is checked every time the latch starts to verify that the door is actually closed. If the door is
open, the latch icon flashes until the door is closed. A changeover micro switch placed right on the
motor shaft and actuated by a 180° cam provides the electronics with the latch position
information
2.4
SYSTEM DESCRIPTION

BWOS 30100 SERVICE MANUAL
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Resistor R49, R51, R52
on the display board
must be configured
properly, according to
the oven model, before
installing the display
board in the oven.
NEVER CUT
RES1
CUT RES2 in
SINGLE
OVENS.
The manual test procedure must be completed and confirmed as per the instructions in this
section. If the control has never been configured before, the display shows F11 Err at power
up. Once a configuration has been accepted, the failure disappears.
At every POWER-UP, the control runs a latch auto-test cycle. The lock icon flashes while
the latch is moving.
Hold [STOP] and [SET CLOCK] button at the same time, for about 3 seconds,
and check that all the display elements and the buzzer turn on for about 5
seconds.
Press [+] to enter test mode then press [+] to get into the next step. Press [-] to
come back to the previous one.
Check the display board SOFTWARE VERSION (d40).
Check the main power board SOFTWARE VERSION (P34).
Check the lower oven power board SOFTWARE VERSION (P34) (DOUBLE
OVENS ONLY).
Check whether the oven model has been correctly detected.
(OTHERWISE CHECK WHETHER THE CONFIGURATION RESISTORS HAVE BEEN SET
PROPERLY, AS DESCRIBED AT THE BEGINNING).
IMPORTANT: The MANUAL TEST procedure can be activated only within 5 minutes
after power on.
To enter in the MANUAL TEST follow the same procedure as the Configuration section 2.5
2.6.1 How to verify the correct selection
At power-up, the control runs a latch auto-test; both lock symbols flash while the
correspondent latches are moving. Wait for the auto-test end. When the control is powered
for the first time the display shows:
2.5
OVEN MODEL CONFIGURATION
2.6
MANUAL TEST

BWOS 30100 SERVICE MANUAL
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F11 Err
Ignore this message and hold [stop] and [set clock] buttons for about three seconds
to start the test.
All the display elements and the buzzer turn on for about 5 seconds then the control
displays
tESt ---
Always press [+] button to proceed to the following step.
Verify the software versions of display and power boards.
Verify that the oven model has been correctly detected by the control, otherwise
check the configuration resistors.
Display
Model
Single 30” multifunction
Verify that the meat probe optional feature is disabled.
Prob Off
Always press [+] button to proceed to the following steps.

BWOS 30100 SERVICE MANUAL
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2.6.2 How to check Single oven hardware
S01: oven lights.
S02: cooling fan.
S03: convection fan. (ONLY FOR CONVECTION CAVITY)
S04: check that no heating elements are energized. The double line break relay must
be open.
S05: bottom element (3000W @240v 12,5) & (2253W @208v 10,8A)
S06: top element (3500W @240v 14,6) & (2629W @208v 12,6)
S07: ring element (2500W @240v 10,4) & (1877W @208v 9,0) Convection fan is
also running. (ONLY FOR CONVECTION CAVITY).
S08: additional element (1030W @240v 4,3A) & (775W @208v 3,7A)

BWOS 30100 SERVICE MANUAL
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S09: cooking mode selector. The display automatically shows the off position value:
tESt C00
Turn the knob clockwise and check that the values correspond to the ones in the
following table:
Code
ENGLISH
Multifunction
C00
Off
C01
Convection bake
C02
Convection broil
C03
Convection roast
C04
Fast preheat
C05
Bake
C06
Broil
C07
Dehydrate
C08
Self-clean
Once back in the off position, the control shows automatically the step number again.

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S10: temperature selector. The display automatically shows:
tESt dEF
(Default) in preset position.
Turn the knob clockwise and verify that the temperature changes between 170°f and
550°f. Verify that in clean position the display shows:
tESt cln
Once back in preset position, the control shows automatically the step number again.
S11: press [set clock] to verify the temperature value actually measured by the
electronics. Press it again to come back to the step number.

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2.6.3 Power supply 208v voltage selection
Wait for the clock appears and display “12:00”, then remember to verify if the power supply in
the house is 240v or 208v. 240v is selected by default, in case of 208v the control must be
properly configured:
Within 5 minutes from the power-up, hold [clock] and [timer] keys at the same time to enter
the user option menu. The display shows:
Sele deg
Hold then [timer] and [stop time] keys until the display gets completely dark then hold [cook
time] and [stop time] further, until the display shows:
Volt 240
Pressing [set clock] key again, edit mode is entered and red digits start blinking. Using [+] or
[-] keys, the control toggles between 240v and 208v options. Hold [set clock] to confirm the
selection.
Hold [timer] and [stop time] again until the display comes back to:
Sele deg
Hold [set clock] to quit from user option menu and come back to clock state.
The voltage setting is kept even after a long power-off.
2.7
DESCRIPTION OF ELECTRONIC CONTROL

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The drawing on the previous page explains how the electronic boards work. Each
relay function is described. The connectors to sensor, potentiometers, and micro
switches are also shown, to allow an easier and faster detection of possible
problems. The main power board generates the voltages for the other boards too.
Test points have been indicated to show where it’s possible to measure the voltages
and see if they are present and correct. Check the cables first, if voltages are correct
on the main power board and not on the others.
The main power board to display board connection cable supports the i2c bus
communication lines (data, clock) and the voltages (GND, -5v).
The main power board to lower power board cable supports the same lines plus an
additional –24v line for the relay voltage.
Each cable between the display board and one potentiometer has GND, -5v and
signal lines.
There is a NTC sensor on the main power board. Its main function is to detect the
temperature of the electronics so that the control can verify the efficiency of the
cooling system. F12 Err is declared whenever an ordinary cooking activity is running
and an over temperature condition is detected (T>95°c). In a double oven, when
clean is running in the upper and a cooking activity in the lower, the control declares
F12 and stops the lower when temperature overtakes 105°C.
The voltage on this sensor depends on its own temperature, the approximately values
matching the ones in the table below.

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Temperature
Temperature
Voltage
0°C
32°F
4,5V
25°C
77°F
3,5V
40°C
104°F
2,7V
85°C
185°F
1V
105°C
221°F
0,64V
TO Reset assembly FAILURES, REMOVE THE CAUSE AND SWITCH THE
SELECTORS IN “OFF” AND “Preset assembly” POSITIONS
RESPECTIVELY.
Faults
No
Upper or single oven RTD temperature sensor failure
F01
Lower oven RTD temperature sensor failure
F02
Upper or single oven motorized latch or switches failure
F03
Lower oven motorized latch or switches failure
F04
Upper or single oven runaway temperature condition 650F
F05
Lower oven runaway temperature condition 650F
F06
Upper or single oven runaway temperature condition 950F
F07
Lower oven runaway temperature condition 950F
F08
Short circuit on display board microcontroller pins
F09
Short circuit on display board
F10
EEPROM data access failure on display board
F11
Electronic control overheating
F12
Meat probe error (check harness, option jumper)
F13
Communication problem between the boards
F14
When a fault occurs, if the control can detect the failure, an error number must
be displayed, as shown in the picture below, with cavity indication for double
oven only.
When a failure occurs, the display
shows the writing FXX Err,
whereas XX is one of the
error codes listed in the
table. To reset the
assembly, the cause must
be removed and the
cooking mode selector
must be turned in the off
position
2.8
FAULT NUMBERS

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2.9.1
Child - safe locking system
All of our ovens are built-in child-safe locking systems. The future is automatically
enabled any time the appliance is connected to the power, any time the switch is
turned on and any time the oven is programmed to run a self-cleaning of the cavity.
The same future it can be is used on the manual mode in the household where a
minor is present to prevent children from getting in touch with hot parts. The
function of this future is explained in details on the chapter 3.3.5.
2.9.2
Over heating sensor
All of our ovens are built with a over heating sensor system:
we have two bi-metal mechanical thermostats for each cavity .
an electronic sensor “NTC” or “negative temperature coefficients” mounted
on the main power board (see chapter 2.7 for more information). The role of
the “NTC” is to protect the electronic boards of an eventually over-heating.
(the “NTC” varies with the values of voltage, only DC, values tabulated at
2.7)
An electronic “PTC” or “positive temperature coefficients” probe mounted on the
inside of the cavity who is responsible of the inside cavity reading of the
temperature. (the “PTC” varies with the resistance – tabulated at chapter…)
2.9.3
Thermostat
All of our ovens are built with two bi-metal mechanical thermostats for each cavity.
The thermostats are mounted in contact with the metal sheet on top of each cavity
as shown in the above pictures.
2.9.4
Double Speed Thermostat
The double speed thermostat is acting in conjunction with the by-pass resistor and is
2.9
OVEN SAFETY FUTURES

BWOS 30100 SERVICE MANUAL
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connected in parallel with it.
In the regular cooking mode when the read temperature at the surface of the metal
sheet in under 158 °F (70 °C) the power is flowing trough the resistor and it feeding
the cooling fan with a voltage AC 93V .
If the temperature of 158 °F (70 °C) is depassed, the thermostat is closing the circuit
and the resistor is by-passed and now we can read at the poles of the cooling fan
motor the full voltage of installed AC 120V and the RPM of the cooling fan will almost
double.
The reset is automatic when the temperature at the surface of the metal sheet
decreases under the 122 °F (50°C) and the cooling fan is reducing the RPM at the
manufacturer factory set-up.
RPM : rotation per minute
2.9.5
Safety Thermostat
The function of the safety thermostat is to protect the of the oven from over heating in
the event of a malfunction of the cooling fan.
Description: In the regular cooking mode when the read temperature at the surface of
the metal sheet in under 311 °F (155 °C) the power is energizing the electronics and
the heating elements as well.
In the event that the temperature is rising over the 311 °F (155 °C) limit, the
thermostat will switch mechanically from off position to on position and all of the
heating elements will be cut off from the power.
All of the electronics will be cut off.
The reset is manual when the cooling fan was replaced or the oven problem was
solved and the temperature is in the right functioning parameters the red button on
the top of case of thermostat must be pressed to reset it (see picture on the previous
page).

BWOS 30100 SERVICE MANUAL
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3.
USER MANUAL
3.1
CONTROL PANEL
3.1.1
Command Keys
[SET CLOCK ]: press it to set or change the time of day.
[TIMER]: press it to set or clear the minute minder.
[COOK TIME ]: press this key to set or change the duration of a cooking activity.
[STOP TIME]: press to set or change the stop time in a timed or delayed cooking.
Whenever one of the former key has been pressed and the time digits are blinking,
press and/or hold the following keys to change the values.
[LIGHT]: Press it to switch the oven lights status .
The function of this key depends on the oven model:
[LOCK] (single oven): hold it together with [+] to actuate safety lock.
[INCREMENT] [+]: press to increase the value of the currently selected variable.
DECREMENT] [-]: press to decrease the value of the currently selected variable.
3.1.2
Display
Preheat light (external).
Four time digits (green), for time of day, minute minder, automatic cooking. AM/PM
indication is also present.
Three temperature digits (red), for oven temperature. Degree unit (°C or °F)
indication is present. It shows the temperature set-point for the current cooking mode,
in the selected cavity.
Box and lock icons to show which cavity is currently selected and which door, if any,
is fully locked, while running in clean or cooling down after a clean.
Writings to indicate which function is active (steady) or waiting for a user input
(blink).
The user interface has the following features: display, preheat light indicators, keys for
commands, cooking mode and temperature selectors.
3.1.3
Knobs
Cooking mode selector (convection). Eight cooking modes + OFF position.
Temperature selector. PRESET and CLEAN positions + continuous range between
MIN and MAX values.

BWOS 30100 SERVICE MANUAL
20
3.2
OVEN MODES
The following table gives an overview of what happens in the oven with each mode
setting.
MODE
CONV.F
AN
UPPER
LOWE
R
RING
ADDITION
AL
PAUS
E
T.
min
T.
defau
lt
T.
max
0
OFF
No
1
CONVECTI
ON ROAST
Yes
20/60
40/60
0/60
170°
F
325°
F
550°
F
2
CONVECTI
ON BAKE
Yes
100%
0
170°
F
325°
F
550°
F
3
CONVECTI
ON BROIL
Yes
52/60
8/60
170°
F
450°
F
550°
F
4
BAKE
No
12/60
40/60
8/60
170°
F
350°
F
550°
F
5
BROIL
No
LEVE
L
Leve
l 1
Leve
l 3
Leve
l 5
6
CLEAN
208V
Yes
43/60
12/60
100%
5/60
887°F
6
CLEAN
240V
Yes
43/60
12/60
5/60
887°F
7
FAST
PREHEAT
Yes
100%
100%
170°
F
325°
F
550°
F
8
DEHYDRAT
E
Yes
100%
120°
F
140°
F
160°
F
BROIL
LEVE
L 1
LEVE
L 2
LEVE
L 3
LEVE
L 4
LEVE
L 5
ON
time
20%
40%
60%
80%
100%
3.3
GENERAL OVEN INFORMATION
Before using your oven for the first time remove all packing and foreign
materials from the oven. Any material of this sort left in the oven may melt
and/or burn when the oven is used.