BSH HBG633BS1 Setup guide

Repair Instructions – Cooking
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1 Concerning this document 3
1.1 Purpose and target group.............................................................................. 3
1.2 Other applicable documents...........................................................................3
2 Safety 4
2.1 Qualification.................................................................................................... 4
2.2 Information in warning messages...................................................................4
2.3 Basic safety instructions................................................................................. 6
2.4 Grouped safety messages..............................................................................7
3 Design and function 8
3.1 Brushless direct current motor....................................................................... 8
3.2 EcoClean Direct............................................................................................11
3.3 Cooking compartment temperature sensor (Pt500 / Pt1000)....................... 12
3.4 Fold-down door.............................................................................................13
3.5 Temperature regulation in the various operating modes (60 cm wide)......... 14
3.6 Temperature regulation in the various operating modes (45 cm wide)......... 19
3.7 Clock............................................................................................................. 24
3.8 Vapour extraction system............................................................................. 25
4 Fault diagnosis 28
4.1 Result faults................................................................................................ 28
Food is not cooked.......................................................................................28
Food is heated too slowly............................................................................ 28
Cleaning action is inadequate...................................................................... 28
Pieces of dough form a skin........................................................................ 28
Food dries out.............................................................................................. 29
4.2 Malfunctions................................................................................................ 30
A short acoustic signal can be heard every 11 minutes, when the appliance
is switched off...............................................................................................30
Display is mirrored........................................................................................30
Rails - Sloping down at the back/askew...................................................... 30
Rails - Jam/become caught..........................................................................30
Baking tray/universal pan warped, bent, bounces ...................................... 31
Operating ring can be rotated easily / no change on the display................. 31
Operating ring does not respond / no display.............................................. 31
Operating ring is hard to turn / remains stuck in a specific position............. 31
Operation is not interrupted when the door is opened................................. 32
Display background white/display hard to read............................................32
Fault code is displayed.................................................................................32
Floor of cooking compartment becomes deformed during or after the drying
phase............................................................................................................ 32
Appliance does not generate any steam......................................................33
Appliance continues to heat although the setpoint temperature has been
attained......................................................................................................... 33
Brightness of microwave differs from that of the oven................................. 33
Cooling fan overruns for too long.................................................................33
Reset during operation in main menu "MyProfile"........................................34
Door (fold-down door) does not open 90°....................................................34
Clock gains > 1 minute every day................................................................34
Time - is fast / slow...................................................................................... 34
Clock loses several minutes a day.............................................................. 35
Time jumps back when switching on the appliance..................................... 35
4.3 Noise............................................................................................................ 36
Rails squeaking............................................................................................ 36
High-frequency whistling sound....................................................................36
Cooling fan motor makes a high-frequency noise........................................36
Cooling fan motor whistles at a high frequency at certain speeds............... 36
Cooling fan overrun too loud........................................................................36
Door closes loudly........................................................................................ 37
4.4 Other faults (surface defects, cracks, breaks)........................................ 38
Rails discoloured after pyrolysis...................................................................38
Baking tray/universal pan do not fit on the rails........................................... 38
Control panel and/or door askew................................................................. 38
Difference in display colour/brightness.........................................................38
Difference in colour of microwave/oven turning handle................................38
Gap between panel and door varies............................................................ 39
Connecting sleeve of the cooking compartment seal is becoming frayed
...................................................................................................................... 39
4.5 Leaks............................................................................................................ 40
Steam escapes in the top right-hand corner................................................ 40
Water drips onto the floor or furniture when the door is opened.................. 41

Repair Instructions – Cooking
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Vapour/condensation escapes......................................................................41
5 Test 42
5.1 Measure the distance between the front glass panel and the cabinet
cavity............................................................................................................. 42
5.2 Checking the alignment of the panel with the door...................................... 43
5.3 Checking the cooking sensor (Lambda sensor)...........................................45
5.4 Check the ventilation of the appliance in the furniture................................. 46
5.5 Check the meat temperature probe (NTC)...................................................48
5.6 Checking the lighting in the cooking compartment.......................................51
5.7 Check the cooking compartment temperature sensor (PT1000)..................53
5.8 Check the cooking compartment temperature sensor (PT500)....................56
5.9 Checking condensation................................................................................ 59
5.10 Checking the position of the wall socket......................................................61
5.11 Checking the socket of the meat temperature sensor..................................62
5.12 Check the heat-resistance of the fitted units................................................63
5.13 Measuring the temperature of the operating surfaces for hot air at
220 °C........................................................................................................... 64
5.14 Measuring the temperature of the operating surfaces for grilling level 3...... 66
5.15 Measuring the temperature of the appliance surfaces for hot air at
200 °C........................................................................................................... 68
5.16 Measuring the temperature of the furniture surfaces for hot air at
220 °C........................................................................................................... 71
5.17 Measuring the temperature in the cooking compartment for hot air at
200 °C........................................................................................................... 73
5.18 Time - check clock accuracy........................................................................ 75
5.19 Checking the vapour system........................................................................76
6 Repairs 78
6.1 Remove the Lambda sensor on the Lambda module.................................. 78
6.2 Removing and installing the baking sensor module (Lambda module)........ 79
6.3 Installing and removing the control panel.................................................... 80
6.4 Removing and installing the control power module......................................81
6.5 Flashing and coding..................................................................................... 82
6.6 Removing and installing the interior light (roof)............................................84
6.7 Install and remove cabinet upper section.................................................... 85
6.8 Installing and removing the cabinet back panel........................................... 86
6.9 Installing and removing the cabinet side panel (left).................................... 87
6.10 Installing and removing the cabinet side panel (right)..................................88
6.11 Remove and install the appliance................................................................ 89
6.12 Dismantling and assembling the fold-down door......................................... 90
6.13 Removing and installing the cooling fan motor............................................ 93
6.14 Removing and installing the power module................................................. 94
6.15 Remove and connect the mains cable.........................................................95
6.16 Removing and installing the deflector.......................................................... 96
6.17 Removing and installing the PT500............................................................. 97
6.18 Removing and installing the meat temperature probe socket...................... 98
6.19 Removing and installing the door hinge.......................................................99
6.20 Removing and installing the vapour valve..................................................100
6.21 Removing and installing the vapour valve motor....................................... 101

Concerning this document
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1.1 Purpose and target group
These repair instructions include information on troubleshooting and repairs.
This information supports the following employees in customer service:
• Service technicians who repair domestic appliances
• Technical storemen in the spare-parts warehouse who determine the required
spare parts
• Call centre employees who take orders
1.2 Other applicable documents
The following documents include additional relevant repair information:
• Documents “Design and function” and “Customer advice”
• Test programmes
• Circuit diagrams
• Exploded drawings
• Parts lists
• Repair videos

Safety
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2.1 Qualification
In Germany repair work may be performed only by electrical engineers who have
been trained by BSH or a centre authorised by BSH.
In all other countries repair work may be performed by comparably trained
technicians only.
2.2 Information in warning messages
2.2.1 Danger levels and warning symbols
Warning messages are provided with danger levels and warning symbols in this
document.
The warning levels consist of a symbol and a warning word. The warning word
indicates the severity of the danger.
Warning level Description
Non-observance of the warning message will result in death or
serious injuries.
Non-observance of the warning message could result in death
or serious injuries.
Non-observance of the warning message could result in minor
injuries.
Non-observance of the warning message could result in dam-
age to property.
Table 1: Danger levels
Warning symbols are symbolic representations which give an indication of the kind
of danger.
Symbol Description
General warning message
Danger from electrical voltage
Risk of explosion
Danger of cuts

Safety
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Symbol Description
Danger of crushing
Danger from hot surfaces
Danger from strong magnetic field
Danger from non-ionizing radiation
Table 2: Warning symbols
2.2.2 Structure
Warning messages in this document have a standardized appearance and a
standardized structure.
Type and source of danger!
Consequences of ignoring the warning.
► Actions to protect from danger.
The following example shows a warning message that warns against electric
shock:
High voltage!
Death by electric shock.
► Disconnect appliance from grid.
► Discharge high-voltage capacitor.

Safety
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2.3 Basic safety instructions
These repair instructions form the basis for a systematic and
safety-conscious procedure for the repair of domestic appliances.
2.3.1 Measures to be taken for each repair
The following dangers are associated with the repair of domestic appliances:
• Danger of electric shock from exposed, live wires and components
• Risk of cut injuries from sharp edges
• Risk of destruction of electronic components by electrostatic discharge
Specific measures prevent injuries and damage. Service technicians are obliged to
take these measures for each repair.
Preventive measures
... against electric shock When carrying out repairs:
• Disconnect appliance from power
supply.
When running tests with power supply
on:
• Use a residual-current-operated cir-
cuit-breaker.
• Select protective conductor connec-
tion less than standard value.
... to prevent cut injuries • wear protective gloves.
... electronic components • wear earthing wrist strap.
• Discharge capacitors.
Table 3: Measures to be taken for each repair
2.3.2 Measures to be taken after each repair
State of the appliance Measures
Appliance has been repaired and is
functionally reliable. • Run tests in accordance with VDE
0701 or comparable national regula-
tions.
• Conduct a performance test.
• Document repair work, tests, mea-
sured values and functional reliabili-
ty.
Appliance is still defective and not func-
tionally reliable. • Clearly identify appliance as "not
functionally reliable".
• Inform customer in writing about the
lack of functional safety.
Table 4: Measures to be taken after each repair

Safety
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2.4 Grouped safety messages
Exposed, live components!
Death from electric shock.
► Disconnect the appliance from the power supply.
► Do not touch housing, frame or components.
► If running tests while the power is on, always use a residual
current circuit-breaker.
► Ensure that the resistance of the protective conductor does not
exceed the standardised value.
Discharge current of charged capacitors!
Death from electric shock. Risk of injury from startle response.
► Disconnect the appliance from the power supply.
► Discharge capacitors.
Exposed, defective components live!
Death from electric shock.
► Disconnect the appliance from the power supply.
► Do not touch housing, frame or components.
► If running tests while the power is on, always use a residual
current circuit-breaker.
► Ensure that the resistance of the protective conductor does not
exceed the standardised value.
Sharp edges!
Cut injuries.
► Wear protective gloves.
Touching electrostatically sensitive components!
Destruction of components.
► Use a system offering electrostatic discharge protection.
► Observe measures to protect components susceptible to electrical
discharge.
Unnecessary replacement of sensitive components!
Destruction of components.
► Systematically check components before replacement.
► Do not replace components without reason.
► Observe technical documentation.

Design and function
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3.1 Brushless direct current motor
A BrushLess Direct Current motor (= BLDC motor) is an Electronically
Commutated motor (= EC motor).
3.1.1 Structure
In a BLDC motor there is no electrical contact for between the movable rotor and
the fixed stator.
The movable rotor consists of permanent magnets. The fixed stator consists of
coils that are controlled in sequence by the motor electronics. This creates a rotary
field.
Fig. 1: An external rotor motor assembly
1 Motor electronics 3 Magnets (rotor)
2 Coils (stator) 4 Motor housing (rotor)
A distinction is made between internal and external rotor motors. For internal rotor
motors, the movable rotor with the magnets is on the inside and the fixed stator is
on the outside. For external rotor motors, the movable rotor with the magnets is on
the outside and the fixed stator is on the inside.
Internal rotor motors are more efficient than external ones, but external rotor
motors have a higher torque than internal ones.
The motor electronics is made up of the power electronics and the control
electronics. The motor electronics generates the voltage with which the individual
coils are controlled.
Power transistors, for example power MOSFETs (Metal Oxide Semiconductor Field
Effect Transistors) are used for this circuit.
3.1.2 Function and model variant
The motor is operated with direct current. Contrary to their name, the functional
principle is not based on that of a direct current motor, but on that of a three-phase
synchronous motor with excitation by means of a permanent magnet. The coils
create a rotating magnetic field, which pulls the permanent magnets with it.
There are motors with at least two or with many coils. Depending on the number of
the coils, the coils are controlled single-phase, two-phase or three-phase.
The efficiency is greater for three-phase controls than for single-phase controls.
The torque is greater for twelve coils than for four.
Fig. 2: BLDC motor, 4-pole, single-phase, for appliances without pyrolytic self-
clean systems
Fig. 3: BLDC motor, 12-pole, three-phase, for appliances with pyrolytic self-
clean systems

Design and function
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3.1.3 Commutation
Commutation is the process in which a current flow passes from one path to
another. There is natural and forced commutation.
Natural commutation is present if the feed voltage originates from an alternating
current or three-phase mains and the current path switching occurs due to its
polarity reversal.
Forced commutation is present if the feed voltage does not originate from an
alternating current or three-phase mains and the current path switching occurs by
means of a control.
EC motors use forced commutation.
Fig. 4: Basic circuit electronic commutation
red coil = north pole / green coil = south pole / grey coil = countervoltage
The big advantage of an EC motor is that the electronic commutation can be
made dependent on the rotor position, rotor speed and torque. The electronic
commutation thus becomes a controller. The way in which the rotary field is
generated determines the characteristic of the EC motor.
Fig. 5: Basic curve showing the torque and (positive/negative) currents in
phases L1, L2 and L3, depending on the rotation angle 0° to 360° for a
block commutation
Fig. 6: Rotary field
red coil = north pole / green coil = south pole / grey coil = countervoltage

Design and function
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There are different ways of measuring the rotor position and speed:
•Sensor-controlled commutation
- Hall or optical sensors are used to determine the position of the rotor. The
advantage of the sensor-controlled commutation is that it also works for
very low torques or when stationary.
•Sensorless commutation
- The countervoltage in the coils, analysed by the motor electronics, is
used to determine the position of the rotor. A minimum rotational speed is
required in order to analyse the countervoltage. For this reason, EC motors
are switched idle until the minimum rotational speed is reached.
New procedures allow precise control even below the minimum speed by using
targeted brief current pulses, which do not move the motor but are influenced by
the rotor’s magnetic field.

Design and function
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3.2 EcoClean Direct
EcoClean Direct is the name of a new process for cleaning the cooking
compartment at Bosch, Siemens and Neff.
For this cleaning process, the enamelled interior walls and the ceiling of the
cooking compartment are covered with an additional ceramic coating.
The ceramic coating is especially coarse and fined pored. The enlarged surface
causes spraying fat and vapours to be distributed over a large area on and in the
special ceramic (blotter effect).
Fig. 7: Ceramic coating (magnified 216x)
The ceramic coating consists of ceramic microspheres in which oxygen is
deposited. In connection with heat, the oxygen allows grease to oxidise and be
broken down into water (steam) and carbon dioxide (CO2).
The higher the temperature, the faster and better the cleaning effect.
Cleaning occurs during baking and roasting when temperatures greater than
200 °C are reached. This causes the ceramic coating to be regenerated and to
remain active for the entire lifecycle of the appliance.
Normally, no additional cleaning cycle is necessary. Should an additional cleaning
cycle be required as an exception due to special operating conditions, this will be
indicated in the display. A cleaning programme can be started manually.
Damage to the ceramic coating due to incorrect cleaning!
► Do not use oven spray, abrasive cleaning agents, tough brushes, scouring
sponges or steel wool soap pads to clean the ceramic coating.
► Use only a soft, damp sponge soaked in a little detergent to clean the
ceramic surface.
3.2.1 How it works
When food is heated, this produces spraying fat that comes into contact with the
ceramic coating of the cooking compartment.
This spraying fat is absorbed by the fine-pored ceramic coating, which causes it to
be surrounded by oxygen on all sides.
In connection with heat, the oxygen causes the spraying fat to oxidise. Water
(steam) and carbon dioxide are generated as a result of the oxidation.
This causes the ceramic micospheres to lose oxygen.
The next time they are heated, the ceramic microspheres are regenerated and are
filled with oxygen again. The cycle can start from the beginning.

Design and function
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3.3 Cooking compartment temperature sensor
(Pt500 / Pt1000)
The cooking compartment temperature sensor measures the temperature in the
cooking compartment.
The electronics switches the cooking compartment heating elements on and off
based on the desired cooking compartment temperature.
The cooking compartment temperature sensor is located in a pipe that is attached
to the back wall of the cooking compartment and protrudes into the cooking
compartment.
3.3.1 Structure
Fig. 8: Components of the cooking compartment temperature sensor (Pt500 /
Pt1000)
1 Connector 3 Platinum resistor
2 Connecting cables 4 Protective tube
Cooking compartment temperature sensors are temperature sensors that use
the dependence of the electrical resistance on the temperature in platinum as a
measuring effect.
For protection, the platinum measuring resistance is in a standardised cabinet or
protective tube.
Platinum measuring resistances are described according to their material (platinum
= Pt) and nominal resistance R0 at a temperature of 0 °C.
• Pt500 (R0 = 500 Ω)
• Pt1000 (R0 = 1 kΩ)
3.3.2 Function
Platinum measuring resistances are PTC resistors with a Positive Temperature
Coefficient = PTC.
A positive temperature coefficient means that the electrical resistance rises with
increasing temperature.
Fig. 9: Function of the PTC
The PTC converts the temperature of the cooking compartment to electrical
resistance.
The electronics evaluates the resistance of the PTC and actuate a switching
process if the setpoint temperature of the cooking compartment is exceeded or
drops below the minimum.

Design and function
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3.4 Fold-down door
3.4.1 Overview of the fold-down door variants for appliances
without microwave
Blue = glass and red = metal oxide coating
Appliance
with pyrolysis
Appliance with-
out pyrolysis
Appliance with-
out slide handle
Appliance with-
out pyrolysis
with full steam
4 Door panels 3 Door panels 3 Door panels 3 Door panels
2 Intermediate
glasses (coated)
1 Intermediate
glass (coated)
1 Intermediate
glass (coated)
2 Intermediate
glasses (coated)
Borosilicate
inner glass
Soda-lime
inner glass
Soda-lime
inner glass
Soda-lime
inner glass
Table 5: Design of the fold-down door variants for appliances without
microwave

Design and function
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3.5 Temperature regulation in the various
operating modes (60 cm wide)
• Appliance with a mounting height of 60 cm
• All sample curves for appliances with no microwave function
• In the event of complaints relating to results or temperatures,
always perform temperature measurements in accordance with
the guidelines and compile a measurement protocol
3.5.1 Temperature regulation
Two different methods are used to regulate the temperature in the cooking
compartment:
•PID control
- EN = Proportional-Integral-Derivative Controller
- DE = Proportional-Integral-Differential Regler
- A PID controller is an extremely precise controller whose characteristics
prevent it from deviating (by trying to reach the target value)
- This type of temperature regulation is used for operating modes that
primarily need precise heat distribution (top/bottom heating, hot air, pizza,
etc.)
•Two-point control
- Two-point control is a somewhat less precise method of temperature
regulation. Two temperatures are defined, one for switching the elements
on and one for switching them off. The average of the switch-on and
switch-off temperatures determines the target temperature
- This type of temperature regulation is used for operating modes that
primarily use radiant heat (all the various grilling modes). The heating
element must glow in order to emit sufficient radiant heat.
The temperature in the cooking compartment is measured using
an oven temperature sensor, (also called a PTC-resistor EN =
Positive-Temperatur-Coeffizient).
3.5.2 Top/bottom heating operating mode
•PID control (Page 14)
- Accuracy: ± 10 K
- Peak heat: up to 20 K (starting at room temperature)
- Heating element: outer circuit for top heating and bottom heating
• Special features and characteristics:
- Circulated air motor performs two 20 -second cycles during heating
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- Can be combined with microwave and also with steam
Fig. 10: Top/bottom heat, as an example the temperature range for a target
temperature of 200 °C
1 Top limit curve 3 Bottom limit curve
2 Set point curve

Design and function
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3.5.3 4D hot air / CircoTherm
•PID control (Page 14)
- Accuracy: ± 10 K
- Peak heat: up to 20 K (starting at room temperature)
- Heating element: Ring heating element
• Special features and characteristics:
- Circulated air motor changes rotation direction
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- Can be combined with microwave and also with steam
Fig. 11: 4D hot air, as an example the temperature range for a target
temperature of 200 °C
1 Top limit curve 3 Bottom limit curve
2 Set point curve
3.5.4 Pizza setting
•PID control (Page 14)
- Accuracy: ± 10 K
- Peak heat: up to 20 K (starting at room temperature)
- Heating element: Ring heating element and bottom heating
• Special features and characteristics:
- Circulated air motor changes rotation direction
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- No combinations are possible
Fig. 12: Pizza setting, as an example the temperature range for a target
temperature of 200 °C
1 Top limit curve 3 Bottom limit curve
2 Set point curve

Design and function
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3.5.5 Hot air grill
•Two-point control (Page 14)
- Accuracy: ± 10 K
- Peak heat: up to 30 K (starting at room temperature)
- Heating element: Outer/inner circuit for top heating
• Special features and characteristics:
- Circulated air motor runs from the start
- Circulated air motor changes its direction of rotation, but not until the target
temperature is reached
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- Can be combined with microwave and added steam
Fig. 13: Hot air grill, as an example the temperature range for a target
temperature of 200 °C
1 Top limit curve 3 Bottom limit curve
2 Set point curve
3.5.6 Full-surface grill
•Two-point control (Page 14)
- Accuracy: irrelevant
- Peak heat: First peak after 10 minutes at level III
- Heating element: Outer/inner circuit for top heating
• Special features and characteristics:
- Radiant heat only (infrared)
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- Can be combined with microwave
- While heating up, only the outer circuit of the top heater is initially switched
on 100 %, meanwhile the inner circuit pulses at 50 %. After about
5 minutes the inner circuit is fully switched on and the heating is adjusted
Fig. 14: Full-surface grill, as an example the temperature range for level 2
1 Top limit curve 3 Bottom limit curve
2 Set point curve

Design and function
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3.5.7 Bottom heating
•PID control (Page 14)
- Accuracy: ± 10 K
- Peak heat: up to 20 K (starting at room temperature)
- Heating element: Bottom heating
• Special features and characteristics:
- Circulated air motor performs two 20 -second cycles during heating
- Maximum target temperatures that can be set 250 °C
- No combinations are possible
Fig. 15: Bottom heat, as an example the temperature range for a target
temperature of 250 °C
1 Top limit curve 3 Bottom limit curve
2 Set point curve
3.5.8 Pyrolytic self-cleaning
•PID control (Page 14)
- Accuracy: 465 °C ± 10 K
- Peak heat: up to 25 K (starting at room temperature)
- Heating element: Outer/inner circuit for top heat and bottom heat
• Special features and characteristics:
- Expressing the pyrolysis duration as a “holding time” means that, after the
target pyrolysis temperature is reached, that temperature is maintained for
a specific period of time. Level I/II/III = 50 / 60 / 90 minutes holding time
- The maximum pyrolysis duration, i.e. the full cycle at level III, is
120 minutes
- The holding time begins during the heating phase as soon as a
temperature of 440 °C is reached
- The air circulation motor is activated while the appliance is heating up and
does not switch off again until the pyrolysis process has been completed
3.5.9 EasyClean
• Control / sequence of operations
- Accuracy: irrelevant
- Peak heat: irrelevant
- Heating element: Bottom heating
• Special features and characteristics:
- Only timer (control), no temperature control.
- Place 400 ml water containing washing-up liquid in the centre of the
cooking compartment floor
- After the function is started, bottom heat is switched on for 5 minutes.
- After the bottom heat is switched off, the timer counts down a soaking time
of 15 minutes
3.5.10 Rapid heat-up
Rapid heat-up uses two types of heating depending on which operating mode it is
started from.

Design and function
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For hot air:
•PID control (Page 14)
- Accuracy: The appliance switches back to the operating mode from which
the rapid heat-up function was started before the temperature reaches its
target value
- Peak heat: As for hot air, this may be slightly higher for temperatures
<150 °C
- Heating element: Top heat outer circuit ~90 % plus ring heating element
• Special features and characteristics:
- Temporary operating mode, not independent.
For conventional operating modes:
•PID control (Page 14)
- Accuracy: The appliance switches back to the operating mode from which
the rapid heat-up function was started before the temperature reaches its
target value
- Peak heat: As for conventional operation modes, this may be slightly higher
for temperatures <150 °C
- Heating element: Bottom heating and ring heating element
• Special features and characteristics:
- Temporary operating mode, not independent
- On reaching 75 % of the selected target temperature the appliance
switches from settings 1 to settings 2 (type of element control and
circulated air motor)
3.5.11 coolStart
•PID control (Page 14)
- Accuracy: ±10 K
- Peak heat: Considerable temperature overshoot < 20 K - 30 K
- Heating element: Bottom heating and ring heating element, subsequently
ring heating element
• Special features and characteristics:
- On reaching 90 % of the selected target temperature the appliance
switches from settings 1 to settings 2 (type of element control and
circulated air motor)

Design and function
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3.6 Temperature regulation in the various
operating modes (45 cm wide)
• Appliance with a mounting height of 45 cm
• All sample curves for appliances with no microwave function
• In the event of complaints relating to results or temperatures,
always perform temperature measurements in accordance with
the guidelines and compile a measurement protocol
3.6.1 Temperature regulation
Two different methods are used to regulate the temperature in the cooking
compartment:
•PID control
- EN = Proportional-Integral-Derivative Controller
- DE = Proportional-Integral-Differential Regler
- A PID control is an extremely precise controller whose characteristics
prevent it from deviating (by trying to reach the target value).
- This type of temperature regulation is used for operating modes that
primarily need precise heat distribution (top/bottom heating, hot air, pizza,
etc.).
•Two-point control
- Two-point control is a somewhat less precise method of temperature
regulation. Two temperatures are defined, one for switching the elements
on and one for switching them off. The average of the switch-on and
switch-off temperatures determines the target temperature.
- This type of temperature regulation is used for operating modes that
primarily use radiant heat (all the various grilling modes). The heating
element must glow in order to emit sufficient radiant heat.
The temperature in the cooking compartment is measured using a PTC-resistor as
oven temperature sensor, (PTC-resistor EN = Positive-Temperatur-Coeffizient).
3.6.2 Top/bottom heating operating mode
•PID control (Page 19)
- Accuracy: ± 10 K
- Peak heat: up to 20 K (if starting at room temperature)
- Heating element: Outer (and inner circuit - depending on the type of
appliance) top and bottom heat
• Special features and characteristics:
- Circulated air motor performs two 20 -second cycles during heating
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- Can be combined with microwave and also with steam
Fig. 16: Top/bottom heat, as an example the temperature range for a target
temperature of 200 °C
1 Curve top limit 3 Curve bottom limit
2 Curve setpoint

Design and function
2017-03-23 / DIS 184_58300000197442_ARA_EN_A Copyright by BSH Hausgeräte GmbH Page 20 of 101
3.6.3 4D hot air / CircoTherm
•PID control (Page 19)
- Accuracy: ± 10 K
- Peak heat: up to 20 K (if starting at room temperature)
- Heating element: Ring heating element
• Special features and characteristics:
- Circulated air motor changes rotation direction
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- Can be combined with microwave and also with steam
Fig. 17: 4D hot air, as an example the temperature range for a target
temperature of 200 °C
1 Curve top limit 3 Curve bottom limit
2 Curve setpoint
3.6.4 Pizza setting
•PID control (Page 19)
- Accuracy: ± 10 K
- Peak heat: up to 20 K (if starting at room temperature)
- Heating element: Ring heating element and bottom heating
• Special features and characteristics:
- Circulated air motor changes rotation direction
- If the target temperature is > 275 °C, then after 40 minutes the
temperature will be reduced to 275 °C
- No combinations are possible
Fig. 18: Pizza setting, as an example the temperature range for a target
temperature of 200 °C
1 Curve top limit 3 Curve bottom limit
2 Curve setpoint