BSH HBG633BS1 - User Manual

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Repair Instructions – Cooking

2017-03-23 / DIS 184_58300000197442_ARA_EN_A Copyright by BSH Hausgeräte GmbH Page 1 of 101

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

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This document provides comprehensive repair instructions for a cooking appliance, covering its design, function, fault diagnosis, testing, and repair procedures. It is intended for service technicians, spare-parts warehouse personnel, and call center employees.

Function Description

The appliance incorporates several key technologies for cooking and cleaning:

Brushless Direct Current (BLDC) Motor: This electronically commutated (EC) motor operates with direct current and features a movable rotor with permanent magnets and a fixed stator with coils. The coils are sequentially controlled by motor electronics to create a rotating magnetic field, driving the permanent magnets. There are different configurations, such as 4-pole single-phase for non-pyrolytic appliances and 12-pole three-phase for pyrolytic models. The motor's electronic commutation can be controlled based on rotor position, speed, and torque, making it a highly efficient controller. Rotor position and speed can be measured via sensor-controlled commutation (Hall or optical sensors) or sensorless commutation (analyzing countervoltage in the coils). New procedures allow precise control even below minimum speeds using targeted brief current pulses.

EcoClean Direct: This cleaning process involves a ceramic coating on the enamelled interior walls and ceiling of the cooking compartment. The coarse, fine-pored ceramic coating absorbs spraying fat and vapors, distributing them over a large area (blotter effect). Ceramic microspheres within the coating deposit oxygen, which, when heated, oxidizes grease into water (steam) and carbon dioxide. The ceramic coating regenerates with subsequent heating above 200 °C, remaining active throughout the appliance's lifecycle. An additional cleaning cycle is rarely needed but can be manually initiated if indicated.

Cooking Compartment Temperature Sensor (Pt500 / Pt1000): This sensor measures the temperature inside the cooking compartment. It is located in a pipe attached to the back wall and protrudes into the compartment. The sensor uses the temperature-dependent electrical resistance of platinum as a measuring effect, making it a Positive Temperature Coefficient (PTC) resistor. The electronics evaluate the sensor's resistance to switch heating elements on or off, maintaining the desired cooking temperature.

Fold-down Door: The appliance features various fold-down door configurations depending on the presence of pyrolysis, slide handles, or full steam functions. These doors can have 3 or 4 door panels, and 1 or 2 intermediate glasses (coated), with inner glasses made of borosilicate or soda-lime.

Temperature Regulation: The appliance uses two primary methods for temperature regulation:

PID Control (Proportional-Integral-Derivative Controller): This highly precise method prevents deviations from the target value and is used for operating modes requiring accurate heat distribution, such as top/bottom heating, hot air, and pizza settings.
Two-Point Control: A less precise method used for operating modes that primarily rely on radiant heat, such as grilling. It defines two temperatures: one for switching elements on and one for switching them off, with the target temperature being the average.

Clock: The appliance has a quartz-controlled real-time clock on the Inter Action Board (IaB). The time is displayed on the Multi Media Boards (MMB) and must be manually set upon commissioning. The IaB synchronizes the MMB's clock display every minute when the appliance is in operation. In Power Saving Mode (PSM), the MMB switches off, but the IaB continues to synchronize the clock display every minute by briefly activating the MMB.

Vapour Extraction System: This system removes excess vapor from the cooking compartment, preventing overpressure and unwanted escape. It also controls vapor concentration. The system uses a vapor valve with an eccentric mechanism, which rotates to determine the opening angle and ratio of the valve, depending on the heating mode and appliance type (conventional, full steam, or microwave).

Important Technical Specifications

Temperature Sensor: Pt500 (R0 = 500 Ω) or Pt1000 (R0 = 1 kΩ).
PID Control Accuracy: ± 10 K (for most cooking modes).
Pyrolysis Temperature: 465 °C ± 10 K.
Pyrolysis Holding Time: Level I/II/III = 50 / 60 / 90 minutes after reaching 440 °C.
Maximum Pyrolysis Duration: 120 minutes (full cycle at level III).
EasyClean: Bottom heat for 5 minutes, followed by 15 minutes soaking time.
Door Opening Angle (Fold-down door): 87 +/- 1° (not 90° due to construction).
Clock Accuracy: Maximum deviation of approx. 30 seconds per month; ± 3 minutes in half a year is permissible.
Vapour Valve Opening Ratios: Vary from 0% (closed) to 100% (open) depending on temperature and heating mode (e.g., "slightly open" is 50% for 0-150°C, 40% for 151-250°C, 35% for 251-350°C in conventional appliances).
LED Lighting: Operated with direct current; 3.5 V for one LED, 7 V for two, 10.5 V for three in series. Open circuit voltage of CPM K138.X25.1 and X25.2 is 22.6 V DC (max 24 V DC).
Meat Temperature Probe (NTC): Resistance values vary with temperature (e.g., 58.11 kΩ to 65.91 kΩ at 20°C). For multipoint probes, two NTCs are measured in series, so values must be halved for comparison.
Cooking Compartment Temperature Sensor (PT1000/PT500): Permissible tolerance is ± 10 Ω.
Minimum Distance between Hob and Oven (X): 2 mm (electric hob) to 5 mm (induction/gas/full-surface induction hob).
Minimum Worktop Thickness (Y): 22 mm (electric hob) to 43 mm (full-surface induction hob).
Heat Resistance of Fitted Units: Admissible cabinet temperature must not exceed room temperature + 70 K (EN 60335). Front edges must not exceed 65 °C, adjacent cabinet edges must not exceed 90 °C.

Usage Features

Cooking Modes: Includes 4D hot air / CircoTherm, Pizza setting, Hot air grill, Full-surface grill, Bottom heating, Pyrolytic self-cleaning, EasyClean, Rapid heat-up, and coolStart.
Microwave Integration: Some modes can be combined with microwave (e.g., Top/bottom heating, 4D hot air, Hot air grill, Full-surface grill).
Steam Integration: Some modes can be combined with steam (e.g., Top/bottom heating, 4D hot air).
Drying Phase: Water on the cooking compartment floor must be wiped away before drying to prevent deformation.
Rails: Designed to slope down at the back (89.4°) to prevent unintentional sliding out. They lock into place when fully extended for easy accessory placement.
Meat Temperature Probe: Used for precise temperature control of food.
Cooling Fan: Operates to cool the appliance, especially after high-temperature operations.
Door Operation: The fold-down door opens to 87 +/- 1°. For some heating types, operation continues even when the door is open.

Maintenance Features

EcoClean Direct: Clean ceramic surfaces with a soft, damp sponge and a little detergent. Avoid oven spray, abrasive cleaners, tough brushes, scouring sponges, or steel wool soap pads.
Vapour Valve: Visually inspect for distortion. If defective, replace the valve or motor.
Condensation Strip: Can be retrofitted to appliances without steaming function to manage condensation dripping onto the floor or furniture when the door is opened.
Connecting Sleeve of Cooking Compartment Seal: Clean with water and a little detergent. Avoid harsh or abrasive cloths, sponges, or cleaning agents.
Software Updates: Essential for optimizing cooling fan overrun, display background lighting, and addressing fault codes.
Control Panel: Magnets' mounting has been improved in new control panels.
Operating Ring (Bosch): If hard to turn, moisten finger (e.g., on dishcloth). If unresponsive, replace the control module.
Baking Tray/Universal Pan: To prevent permanent deformation, place cold or frozen food only onto a cold baking tray. Do not set hot trays onto cold surfaces.
Cooling Fan Overrun: Optimized with CPM software status ≥ 0027.
Display Background: If white/hard to read (Bosch FD 9406-9501), update software.
Rails: If discolored after pyrolysis, it does not affect function (pyrolysis-resistant rails have a plasma coating). If ceramic rollers are jammed or telescopic bar is bent, replace the rail.
Meat Temperature Probe (NTC): Check resistance values against a table based on temperature. Replace if defective.
Cooking Compartment Lighting: LEDs are direct current. Check connection cables and U2 distributor for breaks. Test open circuit voltage of CPM K138.X25.1 and X25.2.
Ventilation: Ensure ventilation cut-outs in base and tall units comply with drawings. Maintain an air gap between the appliance and adjacent cabinets/worktops.

BSH HBG633BS1 Specifications

General

Brand	BSH
Model	HBG633BS1
Category	Oven
Language	English