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BSH HN678G4S1 User Manual

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Repair Instructions – Cooking
2016-03-10 / DIS 184_58300000140186_ara_en_k Copyright by BSH Hausgeräte GmbH Page 1 of 181
1 Concerning this document 4
1.1 Important information......................................................................................4
1.2 Explanation of symbols...................................................................................4
2 Safety 6
2.1 Qualification.................................................................................................... 6
2.2 General safety information............................................................................. 6
2.3 Product-specific safety information.................................................................7
2.4 Measures after each repair............................................................................ 8
3 Design and function 9
3.1 Baking sensor (Lambda sensor).................................................................... 9
3.2 Meat temperature probe (NTC)....................................................................13
3.3 Brushless direct current motor..................................................................... 14
3.4 Steam generation......................................................................................... 17
3.5 Steam generator........................................................................................... 18
3.6 Double pump................................................................................................ 20
3.7 EcoClean Direct............................................................................................21
3.8 Suitability of cookware..................................................................................22
3.9 Cooking compartment temperature sensor (Pt500 / Pt1000)....................... 25
3.10 Fold-down door.............................................................................................26
3.11 Magnetron..................................................................................................... 27
3.12 Swivelling panel............................................................................................ 29
3.13 Temperature regulation in the various operating modes.............................. 30
3.14 Temperature regulation in the various operating modes.............................. 35
3.15 Vapour extraction system............................................................................. 40
4 Fault diagnosis 43
4.1 Result faults................................................................................................ 43
Food is not cooked.......................................................................................43
Food is heated too slowly............................................................................ 43
Cleaning action is inadequate...................................................................... 43
Pieces of dough form a skin........................................................................ 43
Food dries out.............................................................................................. 44
4.2 Malfunctions................................................................................................ 45
Rails - Sloping down at the back/askew...................................................... 45
Rails - Flashovers/discoloured marks.......................................................... 45
Rails - Flashovers between rail and enamelled baking tray......................... 45
Rails - Jam/become caught..........................................................................46
Rails - Uneven running after pyrolysis......................................................... 46
Baking tray/universal pan warped, bent, bounces ...................................... 46
Operating ring can be rotated easily / no change on the display................. 46
Operating ring does not respond / no display.............................................. 47
Operating ring is hard to turn / remains stuck in a specific position............. 47
Operation is not interrupted when the door is opened................................. 47
Display background white/display hard to read............................................47
Fault code is displayed.................................................................................47
Appliance does not generate any steam......................................................48
Appliance continues to heat although the setpoint temperature has been
attained......................................................................................................... 48
Brightness of microwave differs from that of the oven................................. 48
No microwave output / 8A fuse was blown.................................................. 49
Folding panel only opens partially................................................................49
Folding panel opens at an angle..................................................................49
Folding panel does not close automatically................................................. 49
Cooling fan overruns for too long.................................................................49
NeffLight in the "slide and hide" door flashes briefly.................................... 50
Reset during operation in main menu "MyProfile"........................................50
Door (fold-down door) opens during operation (only microwave
appliances)....................................................................................................50
Door (fold-down door) cannot be closed (only microwave appliances)........ 50
Door (fold-down door) does not open 90°....................................................51
Door (fold-down door) closing is displayed (only microwave appliances).....51
Clock gains > 1 minute every day................................................................51
Time - ist fast / slow..................................................................................... 51
Water escapes into the cooking compartment via the steam inlet................52
Remove water tank is displayed when the pyrolytic self-clean system is
started........................................................................................................... 52
Fill water tank is displayed although the tank is still full............................... 52
Increased water consumption when operating in “steaming” mode............. 53
4.3 Noise............................................................................................................ 54
Rails squeaking............................................................................................ 54
High-frequency whistling sound....................................................................54
Cooling fan motor makes a high-frequency noise........................................54

Table of Contents

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BSH HN678G4S1 Specifications

General IconGeneral
BrandBosch
ModelHN678G4S1
Microwave Power900 W
Grill Power1000 W
Control TypeElectronic
ColorStainless Steel
Number of Power Levels5
Interior LightYes
Child LockYes
ConvectionYes
GrillYes
Dimensions (H x W x D)595 x 594 x 548 mm
Cooking ProgramsAuto Cook
TypeBuilt-in Microwave Oven

Summary

Concerning This Document

Important Information

Provides essential information for safe and systematic repair procedures.

Explanation of Symbols

Details warning levels and hazard symbols used in the manual.

Safety

Qualification

Specifies requirements for personnel performing repair work.

General Safety Information

Outlines general safety precautions for domestic appliances.

Product-Specific Safety Information

Covers safety hazards specific to appliance types like microwaves and gas.

Measures After Each Repair

Details post-repair checks and documentation requirements.

Design and Function

Baking Sensor (Lambda Sensor)

Explains the structure and function of the baking sensor.

Meat Temperature Probe (NTC)

Describes the construction and use of meat temperature probes.

Steam Generation

Provides an overview of steam generation components.

Steam Generator

Explains the components and function of the steam generator.

Magnetron

Explains the construction and function of the magnetron.

Temperature Regulation in the Various Operating Modes

Details temperature regulation methods and operating modes.

Fault Diagnosis

Result Faults

Lists faults related to cooking results and their possible causes.

Malfunctions

Details common malfunctions and their troubleshooting steps.

Leaks

Diagnoses and troubleshoots leaks from the appliance.

Test

Checking the Cooking Sensor (Lambda Sensor)

Guides on checking the function and values of the lambda sensor.

Magnetron Prüfen

Describes visual checks and resistance measurements for the magnetron.

Measuring Microwave Output Power

Details the procedure for measuring microwave output power.

Neo-Inverter Prüfen

Outlines checks for the Neo-Inverter, including function and components.

Checking the Vapour System

Tests the function of the vapour valve and motor.

Repairs

Removing and Installing the Control Power Module

Guide for safely removing and installing the control power module.

Removing and Installing the Steam Generator

Procedure for removing and installing the steam module.

Remove and Install the Appliance

Instructions for safely removing and installing the appliance.

Adjusting the Fold-down Door Safety Switch

Steps for adjusting the safety switch on the fold-down door.

Removing and Installing the Magnetron

Steps for removing and installing the magnetron.

Removing and Installing the NEO Inverter

Guide for removing and installing the NEO inverter.