Bosch WAT28400 User Manual

Repair Instructions – Laundry
2017-05-22 / DIS 113_58300000186503_ara_en_c Copyright by BSH Hausgeräte GmbH Page 1 of 85
1 Concerning this document 3
1.1 Important information......................................................................................3
1.2 Explanation of symbols...................................................................................3
2 Safety 5
2.1 Qualification.................................................................................................... 5
2.2 General safety information............................................................................. 5
2.3 Product-specific safety information.................................................................6
2.4 Measures after each repair............................................................................ 7
3 Design and function 8
3.1 Safety system................................................................................................. 8
3.2 Safety switch...................................................................................................9
3.3 Flow-through sensor..................................................................................... 10
3.4 Turbidity sensor............................................................................................ 11
3.5 Light barrier...................................................................................................12
3.6 Calibrating the turbidity sensor.....................................................................13
3.7 Anti-crease function...................................................................................... 14
3.8 3D sensor..................................................................................................... 15
3.9 Load detection function with 3D sensor....................................................... 16
3.10 3G sensor....................................................................................................17
3.11 Unbalanced load detection........................................................................... 20
3.12 Heater with boil-dry protection......................................................................22
3.13 Siphon ..........................................................................................................23
3.14 Drip rail......................................................................................................... 24
3.15 Drain pump................................................................................................... 25
3.16 Aquastop....................................................................................................... 26
3.17 Door lock (electromagnetic)..........................................................................27
3.18 NTC...............................................................................................................29
4 Fault diagnosis 30
4.1 Malfunctions................................................................................................ 30
Gap between control panel and worktop too large...................................... 30
Drum lighting not functioning........................................................................31
Gasket leaking.............................................................................................. 32
Appliance won't switch on/off....................................................................... 32
Pump off....................................................................................................... 32
Does not use fabric softener with extra rinse...............................................33
Water runs in constantly............................................................................... 33
Water leakage...............................................................................................33
Takes too much water.................................................................................. 33
Takes fabric softener immediately................................................................ 33
Option buttons do not function..................................................................... 34
Display dark.................................................................................................. 34
Appliance is not functioning......................................................................... 34
Appliance does not heat up......................................................................... 34
4.2 Result faults................................................................................................ 36
Appliance is not spinning adequately...........................................................36
Creased laundry .......................................................................................... 37
Damaged washing / foreign objects............................................................. 37
Damaged washing / holes............................................................................ 38
Damaged washing / grease..........................................................................39
Damaged washing / colour fading................................................................ 39
Damaged washing / elastane content.......................................................... 39
Damaged washing (light stains)................................................................... 40
Damaged washing (matted)......................................................................... 40
Damaged washing (washing discoloured)....................................................41
Damaged washing (washing shrunk)........................................................... 41
Damaged washing (torn).............................................................................. 42
High detergent consumption.........................................................................42
Poor rinsing result........................................................................................ 43
4.3 Leaks............................................................................................................ 44
Door glass leaking........................................................................................ 44
Seal leaking.................................................................................................. 44
Seal deformed (leaking)............................................................................... 44
Leak between housing of detergent dispenser tray and magnetic
valves............................................................................................................ 45
Detergent dispenser leaking.........................................................................45
Foam coming out of detergent dispenser.................................................... 45
Drainage hose leaking..................................................................................45
Eliminate....................................................................................................... 46
4.4 Noises.......................................................................................................... 47
Noises........................................................................................................... 47
Noises when drum rotating.......................................................................... 47

Bosch WAT28400 Specifications

General

Type	Freestanding
Appliance type	Washing Machine
Loading type	Front Load
Capacity	8 kg
Energy Efficiency Class	A+++
Spin Speed	1400 rpm
Maximum spin speed	1400 RPM
Noise Level (Wash)	48 dB
Noise Level (Spin)	74 dB
Dimensions (HxWxD)	848 x 598 x 550 mm
Special features	EcoSilence Drive, ActiveWater

Summary

Concerning this document

Important information

Provides crucial preliminary information and warnings for safe operation and repair.

Explanation of symbols

Details the various warning and general symbols used throughout the manual for clear communication.

Safety

Qualification

Specifies the required qualifications for personnel performing repairs on the appliance.

General safety information

Outlines essential general safety precautions and risks associated with appliance repair.

Product-specific safety information

Details safety instructions tailored to specific appliance types like microwave ovens and induction appliances.

Measures after each repair

Defines the procedures and checks required after completing any repair work on the appliance.

Design and function

Safety system

Explains the components and operation of the appliance's safety system, including leak detection.

Safety switch

Describes the function and mechanism of the safety switch used in the appliance's safety system.

Flow-through sensor

Details the structure and function of the flow-through sensor for measuring water volume.

Turbidity sensor

Explains the turbidity sensor's principle, function, and its role in optimizing wash programmes.

3D sensor

Describes the 3D sensor's structure and function using the Hall effect to measure drum load and deflection.

Unbalanced load detection

Explains how the appliance detects and compensates for unbalance during the spin cycle.

Drain pump

Details the structure and function of the drain pump, including its thermal protection and error messaging.

Aquastop

Explains the Aquastop's functions including filters, flow limiter, electromechanical valve, and leakage water hose.

Door lock (electromagnetic)

Describes the structure and function of the electromagnetic door lock and its switching contacts.

NTC

Explains the NTC sensor's function in converting temperature to electrical resistance for electronic evaluation.

Fault diagnosis

Malfunctions

Lists common malfunctions, their possible causes, and troubleshooting steps for quick issue resolution.

Result faults

Details faults related to washing results like inadequate spinning, creased laundry, and damaged items.

Leaks

Covers common leakage points such as door glass, seals, and hoses, with corresponding troubleshooting.

Noises

Identifies various noises during operation, their causes, and whether they indicate a fault or normal operation.

Odours/biofilm

Addresses issues related to chemical, plastic, scorching, rotting, or detergent odours and biofilm formation.

Test

Check NTC

Provides a procedure for checking the NTC sensor's resistance at room temperature and when heated.

BLDC motor

Details testing procedures for the BLDC motor, including checking for defects and resistance measurements.

Repairs

Siting the appliance

Provides guidelines for correctly siting the appliance to ensure safe connection and stable installation.

Aligning the appliance

Explains how to align the appliance horizontally using adjustable feet for stability and proper function.

Calibrating the load sensor

Outlines the procedure for calibrating the load sensor, ensuring accurate load detection.

Turbidity sensor calibration

Describes the process for calibrating the turbidity sensor before each wash programme.

Flashing the operating module and power module

Guides through flashing the operating and power modules using I-Service software.

Replacing motor

Provides step-by-step instructions for removing and installing the appliance motor.

Removing/installing the 3G sensor

Details the procedure for removing and installing the 3G sensor on the appliance.

Replacing heater

Outlines the steps for safely removing and installing the appliance's heating element.

Replacing NTC sensor

Describes the process for removing and installing the NTC sensor, typically located near the heater.

Replacing belt pulley

Provides instructions for replacing the appliance's belt pulley, including steps for installation with and without torque.

Replacing the drain pump

Provides step-by-step instructions for removing and installing the appliance's drain pump.

Removing/installing the power module

Provides step-by-step instructions for safely removing and installing the appliance's power module.

Removing/installing the inverter module

Details the procedure for removing and installing the inverter module.