Bosch WKD28350GB Installation Instructions, Instructions for Use, Programme... Setup guide

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Washer-Dryer
1INTRODUCTION...........................................2
1.1 Purpose of the document...................................................2
1.2 General symbols.................................................................2
1.3 Safety-relevant symbols.....................................................2
2SAFETY........................................................3
2.1 Qualifications of service technicians................................ 3
2.2 Identification of danger levels ...........................................3
2.3 Identification of damage to property.................................3
2.4 General safety instructions................................................4
3CONSTRUCTION AND FUNCTION.............6
3.1 Operation.............................................................................6
3.2 Imbalance detection function ............................................8
3.3 Drying cycle.........................................................................9
3.4 Dryer heater.......................................................................10
3.5 Warm spin cycle................................................................ 11
3.6 NTC tasks ..........................................................................12
3.7 Power module ...................................................................15
4DIAGNOSTICS ...........................................17
4.1 Malfunctions...................................................................... 17
4.2 Mechanical faults..............................................................19
4.3 Result faults ......................................................................19
4.4 Noises................................................................................19
4.5 Odours...............................................................................20
5TEST AND REPAIR....................................21
5.1 Connecting the appliance................................................ 21
5.2 Removing door collar....................................................... 23
5.3 Removing the front panel ................................................ 24
5.4 Removing the pump......................................................... 24
5.5 Removing dispenser tray housing.................................. 25
5.6 Removing the fan.............................................................. 26
5.7 Removing the dryer heater .............................................. 28
5.8 Removing the condenser................................................. 29
5.9 Renewing the washing agitator....................................... 31
5.10 Removing the float switch ............................................... 32
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1 INTRODUCTION
1.1 Purpose of the document
The repair instructions:
►guide the service technician in troubleshooting and repairing
domestic appliances
►assist the technical storeman in deciding which spare parts are
probably required for the repair
►inform trainers and technical personnel about design, function,
troubleshooting and repairs
►as supporting documentation support the training of the technical
personnel
Apart from the repair instructions the service technician uses the
following documents:
►Parts list
►Exploded drawing
►Circuit diagrams
The described troubleshooting and repair may be carried out a service
technician only.
These repair instructions are assigned to specific appliances and are
valid for those appliances only.
1.2 General symbols
Symbol Meaning
Special information
1.3 Safety-relevant symbols
Symbol Meaning
General warning information
Danger of electric shock
Risk of being cut
Risk of crushing
Hot surfaces
Risk of explosion
Strong magnetic field
Non-ionising radiation
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2 SAFETY
2.1 Qualifications of service technicians
The described activities may be carried out only by electrical engineers
and electrical engineers for specific activities if they have been trained
by BSH or an authorised establishment.
An electrical engineer is one who, on account of his specialist training,
knowledge and experience as well as his knowledge of the relevant
regulations, can asses the work assigned to him and identify potential
hazards.
An electrical enginner for specific activities is a person who is instruct-
ed and, if required, trained by an electrical engineer on the work
assigned to him and the potential hazards of improper behaviour and
who was instructed on the required protective devices and protective
measures.
Observe country-specific regulations.
2.2 Identification of danger levels
Identification Meaning
DANGER Imminent danger which may result in death or
serious injury if it is not avoided.
WARNING Potentially imminent danger which may result in
death or serious injury if it is not avoided.
CAUTION Potentially imminent danger which may result in minor
injury or damage to property if it is not avoided .
2.3 Identification of damage to property
Identification Meaning
NOTE Warning of potential damage to property
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2.4 General safety instructions
►Read repair manual and follow the instructions included in it.
►Proceed systematically and follow the instructions for
troubleshooting and repairs.
►When repairs are complete, check the effectiveness of the protect-
tive measures in accordance with VDE 0701 or the corresponding
country-specific regulations and perform a function test.
If the test is not passed, clearly identify the appliance as not safe
and inform the operator in writing.
The test for the effectiveness of the protective measures must be
documented in a suitable manner. It is recommended to write
down the measured values.
►Use only conductors which comply with the currently valid health
and safety regulations at work.
DANGER
Exposed live parts
Danger to life caused by electric shock!
►Disconnect the appliance from the power supply.
►Do not touch housing, frame or components.
►Use residual-current-operated circuit-breaker if tests
have to be conducted while the appliance is live.
►Ensure that the resistance of the protective conductor
does not exceed the standardised values.
WARNING
Exposed conductive parts may be live if a fault has
occurred.
Danger to life caused by electric shock!
►Disconnect the appliance from the power supply.
►Do not touch housing, frame or components.
►Use residual-current-operated circuit-breaker if tests
have to be conducted while the appliance is live.
►Ensure that the resistance of the protetive conductor
does not exceed the standardised values.
CAUTION
Risk of being cut on sharp edges.
►Wear protective gloves.
►Wear personal protective equipment.
CAUTION
Charged capacitors
Risk of injury from electric shock and startle response.
►Discharge capacitors before working on the appliance.
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NOTE
Components which come into contact with electro-
static voltage will be damaged beyond repair
►Before carrying out any work, apply protective system
to components susceptible to electrical discharge.
►Observe measures to protect the components suscep-
tible to electrical discharge.
NOTE
Components which are replaced haphazardly will be
damaged beyond repair
►Before replacing components, perform
troubleshooting.
►Check systematically.
►Observe Technical Documentation.
►Do not replace components without reason.
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3 CONSTRUCTION AND FUNCTION
3.1 Operation
3.1.1 Fluff Clean
1 Fluff Clean symbol
3.1.1.1 Function
This programme removes fluff deposits from the lower area of the
drying circuit by gently spinning with water.
The time at which the programme is to run is specified automatically
by the washer dryer and by the Fluff Clean symbol
(Fluff Clean) is indicated on the display.
The symbol is lit until the programme has started.
3.1.1.2 Running the programme:
1. Drum empty and door closed
2. Move porgramme selector to “Fluff Clean”
3. Press (Start/Pause) button
The programme can also be run at any time without a request from
the appliance. It is recommended to run the programme approx. every
10 drying cycles.
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3.1.2 Flexi Time
►Setting the wash duration: normal-medium-minimum.
►Flexi Time is not possible if the “Intensive” option has been
selected.
The saved washing time is not compensated by
temperature or mechanical washing action!
Childproof lock
3.1.2.1 Activation
Simultaneously press the “Option” and “Set/Select” buttons. When the
childproof lock is activated, the key symbol is lit on the display.
3.1.2.2 Deactivation
Simultaneously press the Option and Set/Select buttons for 3 s.
Attention!
►When the appliance is switched off, the childproof
lock is deactivated!
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3.2 Imbalance detection function
If an imbalance occurs, the ramp is terminated before the spin cycle.
There is a limited number of attempts.
3.2.1 Appliances running at 500/600 rpm
Level Imbalance in kg Attempts Speed
Level 0 U< 0.95 – Max. speed
Level 1 U> 0.95 6 No spin cycle
3.2.2 Appliances running at 800–1600 rpm
Level Imbalance in kg Attempts Speed
Cotton
Level 0 U< 0.65 ± 0.05 – Max. speed
Level 1 0.65 < U< 0.95 2 1000 rpm
Level 2 0.95 < U< 1.15 2 600 rpm
Level 3 U> 1.15 2 No spin cycle
Wool
Level 0 U< 0.95 – Max. speed
Level 1 0.95 < U< 1.40 4 600 rpm
Level 3 U> 1.40 2 No spin cycle
Measuring tolerances of the electronics= ± 50 g.
Total tolerance of the appliance (mech. and electr.): +/–100 g
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3.3 Drying cycle
During the drying cycle the fan (2) blows air into the heating duct (10).
The air is heated there and then transferred into the drum and
washing solution tub via the gasket (9).
The warm air absorbs the humidity from the washing and is drawn by
the fan through a connecting piece (5) into the vortex condenser (4).
To support this process, cooling water is sprayed in via a solenoid
valve (1) to cool the air. This process is controlled by evaluation of the
temperatures on the NTCs of the drying cycle.
Surplus water is pumped out of the water solution tub via the drain
pump (7).
At the start of the drying programme a warm spin cycle is run as soon
as a temperature of 54 °C has been reached on the NTC in the
tub (NTCD1).
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1 Condensation valve 6 Pump sump
2 Fan 7 Drain pump
3 Condensation supply 8 Drain hose
4 Vortex condenser 9 Process air gasket
5 Connecting piece 10 Dryer heater heating duct

3.4 Dryer heater
3.4.1 Design
As the new heating duct contains 2x 920 W heating elements, the
drying process can be implemented in 2 stages with a total of 1840 W.
To reduce heat losses, the heating duct is thermally separated from
the fan by a seal.
1 RD1 ÎCNM3
2 RD2 ÎCNM1
3 RD1 ÎTHS/RD2
4 RD2 ÎTHS/RD1
3.4.2 Resistance measurement:
Connections Resistance in ohm
1–2: 104–124
1–3: 52–62
1–4: 52–62
2–3: 52–62
2–4: 52–62
3–4:0
3.4.3 Function
The temperature is controlled by an NTC at the inlet to the gasket.
Cottons/coloureds: 87 °C–90 °C
Easy care: 67 °C–70 °C
Safety temperature:105 °C Îerror message!
In addition a resettable safety temperature controller monitors the
maximum permitted temperature. (150 °C)
During the warm spin cycle (54 UpM) only one heating element is
actuated!
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3.5 Warm spin cycle
3.5.1 Function
The warm spin cycle is used to improve dehumidification of the
washing. It is implemented at the start of the drying programme after
the predrying cycle and when a temperature of 54 °C has been
reached on the NTC at the tub (NTCD1).
Drying programme
Predry Warm spin Dry Cool down
During the warm spin cycle
►the drum is first reversed at 54 rpm,
►then the washing is spun up to max. speed.
►At the same time only one heating element is actuated!
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3.6 NTC tasks
3.6.1 Water temperature
The NTC water heater (4) controls the temperatures for the wash
programmes. The door remains locked if the water temperature is
> 60 °C.
Water temperature NTC > 60 °C (N1)
►If the user stops the wash programme and selects
“Drain/Spin” or “Drain”, a cool down is run before
the drain cycle until the water temperature
< 60 °C (max. filling time 3') is reached.
►If T < 60 °C is not reached within 3’, only the drain
cycle is run.
Water temperature NTC > 60 °C (N1)
►If the user stops the wash programme and selects
“Rinse/Spin”, a cool down is run before the
programme starts until T < 60 °C (max. filling
time 3') is reached.
1 NTC dryer heater (NTCD3) 4 NTC water heater
2 NTC condenser outlet (NTCD2) 5 NTC washing machine tub
(NTCD1)
3 Safety temperature switch
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3.6.2 NTC air temperature
The NTC dryer heater (1), condenser outlet (2) and washing machine
tub (5) control the temperatures for the drying programmes.
3.6.2.1 NTC washing machine tub (5)
The NTCs at the condenser inlet and outlet are used to obtain a better
drying result. If one of the two NTCs fails, the customer does not
receive an error on the display. The appliance continues functioning
“normally” even if the drying time is a little longer.
The NTC washing machine tub (NTCD1) controls the warm spin cycle
and the switching on of the condensation water valve:
►Warm spin cycle: Start at 54 °C
►Cottons/Coloureds: 77.5 °C
►Easy care: 65 °C
NTCD1 defective.
The NTC water heater (4) is used instead of
NTCD1 (5) for monitoring the temperature difference
in the condenser. On account of its lower precision
the safety temperature is reduced from 68 °C to
50 °C. The drying programme is executed without
warm spin cycle!
►Temperature NTC water heater > 50 °C:
If the user stops the drying programme and
selects “Drain/Spin” or “Drain”, a cool down is run
before the drain cycle until the air temperature
NTC < 45 °C is reached.
If NTC < 45 °C is not reached within 10’, only the
drain cycle is run.
Air temperature NTCD1 > 68 °C (N0)
►If the user stops the drying programme and
selects “Drain/Spin” or “Drain”, a cool down is run
before the drain cycle until the air temperature
NTCD1 < 60 °C (max. filling time 10') is reached.
If NTCD1 < 60 °C is not reached within 10’, only
the drain cycle is run.
►If the user stops the drying programme and
immediately starts a new drying programme,
the warm spin cycle is not run. Otherwise the
programme will run normally.
(does not apply to programme reset)
3.6.2.2 NTC condenser outlet (2)
The NTC condenser outlet switches the condensation valve off:
►Cottons/Coloureds: 74 °C
►Easy care: 62 °C
NTCD2 defective.
►The condensation valve is activated after 20 min.
from the start of the drying cycle and remains on
until the cycle ends.
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3.6.2.3 NTC dryer heater (1)
The NTC dryer heater (3) controls the temperatures for the drying
programmes:
►Cottons/Coloureds: 90 °C
►Easy care: 70 °C
►Excess temperature: 105 °C
3.6.2.4 Safety temperature switch (3)
The safety temperature switch limits the temperature in the heating
duct to 150 °C if the NTCD3 (1) is defective (characteristic shifted).
It can be manually reset.
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3.7 Power module
1 Light well - removable
1 CNM Dryer heater (RD1+2) +
safety temperature switch THS
2 CNA Water heater (RA)
3 Humidity sensor (optional)
4 CNI NTC water heater (NTC)
5 CND NTC dryer heater (NTCD1–3)
6 CNC Water level controller/pressure switch (PRL)
7 CNH Aquastop valve (EAQ) + Aquastop switch (AQS)
8 CNF Pre and main wash valve (EVC, EVW) + drain pump (DP)
9 CNG Condensation valve (EVC)
10 CNV Fan motor (MV)
11 Power supply
12 CNE Motor (M)
13 CNB Door lock (BP)
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1 TR4 Door lock (BP)
2 R6 Dryer heater (RD2)
3 R5 Dryer heater (RD1)
4 R4 Water heater (RA)
5 R3 Motor (M)
6 TR7 Motor (M)
7 Buzzer
8 TR10 Aquastop (EAQ)
9 TR8 Hot water valve (EVH)
10 TR6 Drain pump (DP)
11 TR3 Prewash valve (EVP)
12 TR2 Main wash valve (EVW)
13 TR1 Condensate valve (EVC)
14 TR11 Fan (MV)
15 R2 Motor (M) – reversing
16 R7 Door lock (BP)
17 R1 Motor (M) – tapping
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4 DIAGNOSTICS
4.1 Malfunctions
Fault Cause Fault correction Advise customer
Door cannot be opened Appliance not switched on Switch on appliance – magnetic
lock opens
Temperature higher 60 °C (3)
NTC defective
Advise customer
Replace NTC
Water level too high (level?) (3)
Water level sensor defective
Advise customer
Replace water level sensor
Speed too high
Tachogenerator signals speed of
the drum over 60 1/min
Advise customer.
Replace motor
Door lock defective Check door lock, if required replace
No spin cycle No draining – pump or drainage
hose blocked
Clean pump and drainage hose
No draining – pump defective Replace pump
Drive belt worn Attach drive belt and check motor
belt pulley attachment and
alignment of the appliance
Drive belt torn Attach drive belt and check motor
belt pulley attachment
Fluff formation after drying in the
door area
During the drying cycle more or
less fluff occurs depending on the
type of washing
Advise customer Fluff formation normal depending
on type of washing.
If required, clean door and frame
before removing the washing.
Possibly use fluff clean programme
more frequently.
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Fault Cause Fault correction Advise customer
“Drain/Spin” or “Drain” programme
is not run
Water temperature NTC > 60 °C
(N1)
Before draining, a cool down is run
until the water temperature < 60 °C
is reached (max. filling time 3').
If T < 60 °C is not reached within
3 min., only the drain cycle is run.
This may occur if the user stops the
wash programme and selects
“Drain/Spin” or “Drain”
Air temperature “NTCD1” > 68 °C
(N0)
Before draining, a cool down is run
until the air temperature NTCD1 <
60 °C is reached (max. filling time
10'). If NTCD1 < 60 °C is not
reached within 10’, only the drain
cycle is run.
This may occur if the user stops
the drying programme and selects
“Drain/Spin” or “Drain”
"Rinse/Spin" programme is not run Water temperature NTC > 60 °C
(N1)
Before the programme starts,
“cool down” is run until the water
temperature < 60 °C is reached
(max. filling time 3').
This may occur if the user stops
the wash programme and selects
“Rinse/Spin”
Air temperature “NTCD1” > 68 °C
(N0)
Before the programme starts, a
cool down is run until the air
temperature NTCD1 < 60 °C is
reached (max. filling time 10').
This may occur if the user stops
the drying programme and selects
“Rinse/Spin”
Drying programme is run without
warm spin cycle
NTC washing solution tub (NTCD1)
defective
Check NTC washing solution tub
(NTCD1), if required replace.
Drying time too long NTCD1 or NTCD2 defective. No
error on the display, extended
drying time.
Check NTCD1 and NTCD2 and,
if required, replace.
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4.2 Mechanical faults
4.3 Result faults
4.4 Noises
Fault Cause Fault correction Advise customer
Damage to washing Foreign objects in the tub Check tub and drum for foreign
objects (e.g. paper clips, bra
underwire, etc.)
Collar defective Check gasket is correctly installed,
if required, replace
Sharp-edged areas on the drum Check drum with a nylon socking
Fault Cause Fault correction Advise customer
Washing too wet after drying
programme
Imbalance, therefore poor
dehumidification due to spin
termination – drying capacity
inadequate
Advise the customer Spin washing before drying.
Combine large and small items
of washing
Fault Cause Fault correction Advise customer
Clicking or banging noises Shock absorbers or suspension of
the washing solution tub (springs)
defective
Replace shock absorbers or
springs
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4.5 Odours
Fault Cause Fault correction Advise customer
Smell of burning/smoke Heater blocked with fluff Clean heater and process air
passage
Heater burnt out Check heater, if required, replace
Check safety temperature
controller, if required replace
Check heater NTC, if required
replace
Fusty odour Drain hose blocked Check pump and drain hose,
if required clean
Waste water connection (siphon)
blocked
Check waste water connection
(siphon) and advise customer
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