Electrolux Compact, EDW 503 Service Manual

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

SERVICE MANUAL

© AEG Hausgeräte GmbH

Muggenhofer Straße 135
D-90429 Nürnberg
Germany

Fax [phone]

Spares Operation

Publ.-Nr.:
599 516 219

01.03

EN

Edition:

Dishwasher

COMPACT

911 328 .....

DISHWASHER

COMPACT

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

Index

1. Technical specifications .........................................................................................3

2. Installation water drainage ..................................................................................... 3

3. Components ..........................................................................................................4

Capacitor ............................................................................................................... 4

Pressure switch ..................................................................................................... 4

Heater element ...................................................................................................... 4

Circulation pump ....................................................................................................5

Drain pump ............................................................................................................ 5

NTC temperature sensor ....................................................................................... 5

Programmer ........................................................................................................... 5

Detergent dispenser .............................................................................................. 6

Rinse aid dispenser ............................................................................................... 6

Inlet valve ............................................................................................................... 6

Anti flood switch .....................................................................................................6

Water softening system .........................................................................................7

4. Position of components ................................................................................. 8 - 11

5. Water course scheme..........................................................................................12

6. Water inlet ...........................................................................................................13

7. Rinsing system ....................................................................................................14

8. Strainer system ....................................................................................................15

9. Level control system ............................................................................................16

Inlet system / Overfilling/leakage protection (old version) ...................................17

10. Drain system ........................................................................................................18

11. Regeneration ....................................................................................................... 19

12. Thermostats ......................................................................................................... 20

13. Temperatur and safety systems ..........................................................................21

14. Wirings and diagrams .................................................................................. 22 - 25

15. Service informations ............................................................................................ 26

Spülraum ............................................................................................................. 26

Housing ................................................................................................................ 27

Panel / base plate ................................................................................................28

Components (lower region) ................................................................................. 29

Door components ................................................................................................ 30

Door switch ..........................................................................................................31

Rinse aid dispenser / detergent dispenser coil ....................................................32

Pressure switch / Anti-siphon valve / level control container ...............................33

Thermostats / Heater element .............................................................................34

Programmer / switch unit / float switch / inlet valve .............................................35

Circulation pump / drain pump ............................................................................. 36

Softener / regeneration valve ............................................................................... 37

Leakage points ............................................................................................ 38 - 39

16. Fault tracing ................................................................................................. 40 - 42

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

1. Technical specifications

Power supply: 230 V - 50 Hz
Heater element: 1200 W
Power rating: 1280 W
Fuse required: 13 A

Height: 460 mm
Width: 450 mm
Depth: 480 mm

Water pressures: min. 50 KPa (0,5 bar)

max. 1000 kPa (10 bar)

Capacity: 5 settings

2. Installation water drainage

Place the discharge hose over the sink as illustrated.

It may not at any point be higher then 75 cm over the surface
which the dishwasher is standing on. If runs higher, operation of
the dishwasher might be impaired.

It is also important to ensure that the inside diameter of the hose is
not less than 13 mm at any point. If the discharge hose is too long
it can easily be cut to the right length.

Cut the hose to a suitable length, using a sharp knife.

Fit the elbow supplied onto the end of the hose.

1. On/Off-button

2. Temperature selector

3. Extra drying effect

4. Programme selector

5. Indicator lamp

6. Salt indicator lamp

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3. Components

Capacitor

The circulation pump is connected to a capacitor.

2,0 µF for UK
2,5 µF for Europe

Pressure Switch

The pressure switch controls the water level.
Without water, contact is closed.

Adjusting:

Turning the marked screw clockwise + level
Turning the marked screw anti clockwise - level

Heating element

Power output 1200 W
Resistance approx 42 W

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

Circulation Pump

The circulation pump is driven by an asynchronous
motor with an starting winding. The starting winding
ist in circuit with a 2,5 µF (Euro) capacitor. (2 µF UK)

Rating: 60/80 W
Main winding resistance 158 Ohm
Starting winding resistance 158 Ohm

Drain Pump

The drain pump is driven by a synchronous motor.

Power output 21/19 W.
Pump rate 10-12 l/min.
Main winding resistance 200 Ohm

Thermostats (normally open)

45°C closes at 41°C

opens at 33°C

55°C closes at 50°C

opens at 42°C

65°C closes at 61°C

opens at 53°C

Overheating protection (normally closed)

opens at 83°C
closes at 0°C

Programmer

ELBI

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Detergent dispenser

Coil resistance
3000 Ohm

Rinse aid dispenser

Rinse agency capacity 140 ccm
Solenoid coil resistance 1900 Ohm

Inlet valve

Capacity, max, 4 l/min
Resistance 4800 Ohm

Anti flood switch

If the anti flood swich in the base tray is activated, all
components are switched off except the drain pump

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Water softening system

Operation of the water softening system

When water is admitted, the inlet valve (1) opens and the
hard water flows down into the ion exchanger (5),
through which it flows and is softened before flowing
through the water inlet (6) and then being sprayed into
the Washing chamber.
!n the meantime, the container for the regeneration
water (2) is also filled with water.
lf the rubber plug (3) at the rear of the machine is in place
as shown in the ilustration, the machine can handle
water with a hardness of up to 20'dH. !f the rubber plug
is removed. The regeneration water volume will be
increased, and the machine can then handle water with
a hardness of up to 35°dH.
During the dishwashing programme, the ion exchanger
will gradually be filled with lime and, to be able to soften
the water during the next dishwashing cycle, the ion
exchanger must be restored to its original condition.
This is done by a process known as regeneration, which
takes place according to the actual programmer dia­gram.
The solenoid valve (7) between the salt container and
the ion exchanger will then open, and regeneration
water will flow into the salt container (4).
A corresponding amount of water saturated with salt is
thus forced into the ion exchanger. The salt solution is
present in the ion exchanger during the last rinse, and
the small plastic balls will be recharged with sodium ions.
According to the actual programmer diagram, the inlet
valve will open and will allow about 2 litres of water to flow
through the ion exchanger to flush away the now dissolved
lime residues. The lime-rich water is then flushed
immediately out to drain, and the machine is reset and
ready for the next water fill.
The whole of this process is integrated into the
programme of a machine with water softening, and thus
takes place fully automatically.

It should also be noted that it is important to use only
coarse salt, since fine-grained salt would. form lumps.

Water which is rich in lime is said to be "hard".
Water hardness is measured in German degrees
of hardness (dH). Water up to 10dH is normally
regarded as soft, and above this value, it is
regarded as hard.
The phosphates in the detergent can handle the
hard­ness in soft water. But if the water is hard,
precipitations will occur, i.e. lime will be deposited
on the dishes and in the dishwasher.

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4. Position of components

Signal lamps

Switches

(temperature)

Programmer / Timer

Outer door

Inner door

Door opener

Door seal

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Thermostats

Rinse-aid dispenser

Housing

Interference filter

Coarse sieve

Fine strainer

Base plate

Basek rails

Door switch

Coil for detergent
dispenser

Heating element

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Pressure switch

Regeneration valve

Circulation pump

Drain pump

Float switch

Inlet valve

anti-siphon valve

Inlet hose

Drain hose

Base plate

Softener

Reed switch
salt indicator

Air chamber

Water collector

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Cup support

Dish rack

Cuttlery basket

Pump housing

Sealing ring

Spray arm

Basket roller

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5. Water Course Scheme

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6. Water Inlet

The water flows into the regeneration dosage chamber via inlet valve, over air break, into
regeneration dosage chambers and into softener

The level control container operates the pressure switch.

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7. Rinsing system

The function of the rinsing system is to wet the
dishes loaded into the machine.
The electric motor of the circulation pump is
delivered with the impeller fitted to it. Half the
pump casing forms part of the plastic chassis,
and the other half is bolted in position inside the
washing chamber.
This arrangement ensures, that the joint between
the two halves of the pump casing is inside the
washing chamber.
An O-ring provides the seal between the motor
assembly and the chassis.
The rating of the electric motor is 60 watts(50 Hz)
or 80 watts(60 Hz) and the pump circulates around
30 litres per minute.
The electric motor needs assistance at the instant
of starting, which is provided by a starting
capacitor.
The motor mounting is very important to the sound
level. Since the movements of the motor are a
minimum at the centre, the motor is secured to a
rubber mounting in the centre, at the rear end of
the motor.
To ensure that no vibrations will be transmitted
from the motor to the base plate, a plastic foam
spacer strip is fitted to the bottom of the chassis.
The pump casing half which is inside the wash­ing chamber also contains the spray tube bear­ing with a stainless steel shaft.
The underside of the spray tube is fitted with a
seal ring to minimize leakage.
The shape and orientation of the holes in the spray
tube are such that the dishes furthest away in the
corners of the machine will also be effectively
washed.
The spray tube rotates anti-clockwise at a speed
of 10 - 20 1/min.
If the speed is too high, the dishwashing results
will be poor, and if the speed is too low, the spray
tube may stop al-together.
The pressure in the spray tube is just over 0.2 kg/
cm². The spray tube is retained by a ceramic nut
with a left-hand thread, to en-sure that the rotation
of the spray tube will not cause the nut to unscrew
itself. This means that the nut must be un-screwed
in the wrong direction.

CERAMIC NUT

SPRAY TUBE

SEAL RING

PUMP CASING HALF

MOTOR MOUNTING

O-RING

PLASTIC
TRAY

CIRCULATION PUMP

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8. Strainer system

The strainer system is one of the systems which are most important to the performance of the
dishwasher.
The design of this system is largely decisive to whether the dishwasher will be able to perform its
most fundamental task: to wash the dishes clean.
The strainer system must trap particles of food, etc. and ensure that these particles will not be
recircu-lated and deposited back on the dishes.
Another consumer requirement is that the strainer system must be self-cleaning, so that it will not
be necessary to wash the strainers by hand every time or every other time the dish-washer is
used.

The strainer system consists of two parts which
jointly contain three different strainers, each of
which with its own particular task.
The fine strainer consists of a shaped stainless
steel plate which is perforated with 0.5 mm
diameter holes and is retained in a plastic frame.
The dishwashing water passes through this
strainer about 420 times during a normal
dishwashing programme.
The bottom of the chassis is designed in such a
manner that particles will continually be flushed
away to the coarse strainer. All particles larger
than 0.5 mm will be trapped, and the water flowing
through the strainer will thus be virtually clean.
The performance of the strainer is highly
dependent on the suction of the circulation pump
being equally distributed over the entire strainer
area. If the suction is higher at any one point,
particles will be drawn through the fine strainer at
that point, and they would then disintegrate and
would be very dif-ficult to trap.
It is also very important for the plastic frame of the fine strainer to seal well against the chassis, so
that particles will not by-pass the strainer and be deposited back on the dishes.
The fine strainer also includes a small plastic boss. This is designed to prevent the build-up of pressure
and air cushions under the strainer. An air cushion under the fine strainer would otherwise prevent the
water from flowing through the fine strainer, and insufficient water would then be supplied to the cir­culation pump.

Particles are thus flushed continuously down into the coarse strainer, where they are retained until
the water is pumped out to drain. The coarse strainer is also designed to trap larger particles, such as
pieces of meat, toothpicks, etc.

To retain the good dishwashing properties of the machine, the consumer must empty and rinse the
strainers as soon as they show signs of clogging.

Coarse strainer

Fine strainer

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9. Level control system

There are two basic ways of metering the right amount of water into a dish-washer. The first is to
open the inlet valve for a certain predetermined period of time, while the other is to use some
means for measuring the water level in the machine.
The major disadvantage of the first method is that if the mains water pressure is low (which is very
common in Europe), the time allowed will be too short to fill the machine with a sufficient amount of
water. A time-controlled machine needs a water pressure of at least 1.0 - 1.5 kg/cm2. The Compact
dishwasher is level-controlled and will perform satisfactorily at mains water pressures down to 0,5 kg/
cm².

PRESSURE
SWITCH

LEVEL CONTROL
CONTAINER

Air pressure, p

Water pressure, p

Washing
chamber

Level control container

Operation of the level control system of the
Compact dishwasher

As the machine is being filled with water, the water
level in a level control container located on the
side, outside the chassis will also rise. The
container is connected to a pressure switch by
means of a hose.
As the water level in the contairier rises, the air
pressure in the hose will also increase and will
act on the pressure switch. When the pressure
has risen to a preset value, the pressure switch
will open, which will cause the inlet valve to close.
The programmer motor can now advance to the
next step.
When the drain valve then empties the machine,
it will also empty the level control container, and
the pressure switch will revert to its original
position, in preparation for the next
water fill.
The inlet hole of the level control container is below
the strainer, and the water in the level control
system is therefore always clean and filtered.
If the water level should drop for any reason while
dishwashing is in progress, the pressure switch
will close, which will interrupt the water circulation,
and the water heating possibly restart the
programmer and allow the programmer to
advance in the programme.
It is important for the machine to be perfectly level
when it is in operation, since a 5 mm difference in
level corresponds to about 1 litre of water.

Water level

between 20 - 24 mm

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Overfilling/leakage protection - old version

E The inlet valve also incorporates a mechanical tripping

actuator. The tripping actuator is operated by a floating

body .
If water should leak into the base plate for reason,
the floating body will close the inlet valve mechanically.
The leakage protection will operate even if the
power supply cable is disconnected.

Reverse flow protection.

F This prevents contaminated water from the dishwasher

from being drawn back into the water mains, even if a
vacuum should occur in the water mains.

Inlet system - old version

A The inlet hose is a rubber hose with plastic cover.

The coupling nuts are made of plastic (which reduces
the risk of crossedhreads) . The inlet hose is inside the
washing chamber when the machine is delivered, and the
consumer must fit the hose when installing the machine.
He must then also decide whether the hose is to run to the
right or to the left.

B On the machine, the inlet hose is connected to the

inlet valve (also known as solenoid valve). When the
inlet valve is energized (via the programmer) the valve will
open and water will flow into the machine. When the level
controller has sensed that the water has reached the
correct level, it will open the power supply circuit to the inlet
valvet and the valve will close.
The valve is designed to open and close slowly. It is
important to ensure that no harmful pressure surges will be
caused in the water supply mains.

D Flooding. If a component or seal should start to leak,

the water will collect on the base plate and will
activate the floating body. To some extent, the wall along
which the water flows serves as a brake, so that spillage of
a few drops will not cause the moisture sensor to trip.

C Overfilling protection. If the level sensor should fail to

operate and the inlet valve should remain open after
the water has reached the correct level, the water will run
across an overflow baffle down into the base plate, where
the floating body of the flooding protection system will
close the inlet valve and will prevent water damage.

Old version

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10. Drain system

The system consists of inner and outer drain hoses and a drain pump, and its function is to transport
the contaminated water as efficiently as pos-sible from the machine to the waste water system of the
buildin

OUTER DRAIN HOSE

INNER DRAIN HOSE

DRAIN PUMP

DRAIN CASING

The drain pump is connected to the chassis at the coarse
strainer and is sealed with an O-ring. The motor is a per­manent-magnet motor, with the rotor.mounted inside a
plastic housing and the stator fitted to the outside of the
plastic housing. The design is such that the pump has no
traditional shaft seat which always invol-ves the risk of
leakage.

The pump performs equally well in both directions of rotation, and the direction in which it
rotates is a matter of pure chance. This also means that the pump is vir-tually proof against
jamming. If some object should enter the pump casing and jam the impellar, the motor will
immediately make a new starting attempt in the op-posite direction. Even if the impellar is
seriously jammed (e.g. by a toothpick), the motor will most probably release the impellar
within about a second. The power consumption of the motor is 23 watt, and the pump
capacity is about 10 I/min.
The internal drain hose is connected to the drain pump. To prevent the risk of the machine
being emptied by siphon action, the hose routes the drain water through a loop running up
to the top of the chassis and then through the outlet at the bot-tom of the machine, to the
outer (visible) drain hose. A hole is provided at the highest point of the inner drain hose for
venting the system.
If the drain hose is permanently connected to a water trap, it is very important that the

inside diameter of the drain system should not be less than 13 mm at any point.

New

antisiphonic device

If the end of the take-off hose
is below the level of the water
in the wash space, a siphon
effect is possible, that is, the
machine runs empty. This is
avoided by the ventilation
through the anti-siphon valve.

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11. Regeneration

The water chamber for regeneration contains 350 ml water. During regeneration, the regeneration
valve is energized. The 350 ml water runs into the salt container and mixes with the salt to form a
brine solution.

In the top of the salt container there is an opening with a small filter, from here the brine solution
enters the softener where the resins are regenerated.

The softener has 5 settings and can be adjusted to suit the degree of water hardness.

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12. Thermostats

The thermostats are pressed into the
tubular mountings in the plastic chassis.
They measure the temperature on the
outside of the plastic wall, which leads to
a certain difference between the water
temperature and the thermostat
temperature.
However, the specifications of the
thermostats take this into account. (In one
particular case, the same thermostat is
used for two different temperatures.
This is possible because the thickness of
the chassis is different at the two
thermostat mountings.
The thicker the wall, the greater the
temperature difference and the higher the
water temperature.)
Depending on the Programme selected,
the thermostats will be switched in, and
will interrupt the power supply to the heater
element via the programmer when the
water has been heated to the required
temperature.
As in the case of al! other components,
there is a certain amount of tolerance on
the nominal temperature of the
thermostats.
For the breaking temperatures, the
tolerance is ±3°. There is also a "differen­tial", i.e. a difference between the
temperature at which the thermostat opens
the circuit and the temperature at which it
returns to the original position. This diffe­rential is 8°C.
The breaking values are adjusted to give
the following water temperatures: 45, 55,
65 and 72'C.

Colours coding of the thermostats

A = brown 83°C (anti boiling protection)

B = black 65°C (two)

C = grey 55°C

D = white 40°C

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13. Temperature control and safety Systems

The dishwashing detergents available on the market today require a certain water temperature before
they can dissolve the food residues in a satisfactory way.
A temperature control system consisting of a heater element and thermostats ensures that the
water will be heated to the correct temperature.

Heater elements is 1200 watt.

In addition, the machine includes a safety system, the function of which is to protect the temperature
control System against accidental overheating.
The overheating safety system is very important. Several components and systems are involved in
different ways.

The following conditions must be satisfied before the element can be switched in:

 The rnain switch must be closed, the door must be closed so that the door switch is closed,

and a Programme must have started.

 The machine must contain the correct amount of water (as determined by the level control

pressure switch).

The safety system will trip if

 The quantity of water is insufficient.
 The water temperature has risen to about 85°C without the thermostat tripping.

In addition, two overheating protections are incorporated into the element, i.e. one at each connection
end.
These are designed so that they will burn off if the element is switched on but has no cooling water
around it.

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14. Wirings (Example DSC 14)

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Diagram (Example DSC 14)

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Wirings (Example DSC 382)

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Diagram (Example DSC 382)

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15. Service Informations

Coarse filter

The purpose of the coarse filter is to catch large objects. Make
sure that the filter is always clean.

Fine filter

It is just important to keep this filter clean. The fine filter can
easily be lifted out for cleaning when the coarse filter is removed
at first.

Spray arm

The spray arm is to be removed by unscrewing
the nut clockwise (it has a left-handed thread)
and lift of the spray arm.

Sealing ring

To clip out he sealing ring a screwdriver gives
support.

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Housing

After removing the housing screws (lay the machine on its side) from the bottom of the
machine, the housing is unclipped front and back from the catches and can be removed.

All components from the left and right side are now accessible.

You need
screwdriver

Torx TX20

Programmer / Timer

Thermostats

Rinse-aid dispenser

Interference filter

Coil for
detergent dispenser

Pressure switch

Drain pump

anti-siphon valve

Softener

Air chamber

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Replacement
of the panel

Remove the screws from the
panel frame.

Remove the turning knob.
Carefully unclip the front .

Before finally opening, unclip
the lamps.

Remove the

base plate

The base plate of the machine

is held with screws on the

lower panel and at the bottom.

Lay the machine on its back

and lift off the base plate.

It contains the bosses for the

overflow water and the

flooding switch.

After removal you come to the

most important functional

components.

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Heating element

Regeneration valve

Circulation pump Float switch

Inlet valve

Programmer / Timer

Thermostats

Interference filter

Drain pump

Air chamber

Softener

Switches

(temperature)

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Replacement of the
components within
the door.

After removing these screws,
the door handle and
detergend dispenser flap can
be removed from the inner
door.

After removing
the spring, the
door-opener can
be removed from
its hinges.

Re-assembly is carried out
in the reverse order.

Outer and inner door

They snap together and are held by plastic latches, on the under side. They can easily be unsnapped

The seal is easily

be clipped in the

inner door frame.

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To remove the inner door

Remove the lower panel and the outer door. Open the door and remove the four screws (two on
each side) securing the rack rails.
Open the door to an angle of about 130° and carefuly relese the hinge pin on the right hand side.
On the left hand side, the hinge pin is inserted in a hole without slot.

Door switch

Remove the the screws on the under side of the upper panel. Lift off the upper panel. The door switch

is easily be screwed.

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The coil with tappet as support
for the detergent dispenser is
held by two screws.

Remove this
screw to
dismount the
rinse aid
dispenser unit

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The pressure monitor
is simply screwed.

The take-off hose ventilation can be unscrewed
for cleaning when necessary, in case these rubber

The air should be able to enter the hose from the
holder - not the other way around!

Anti-siphon valve

The motor capacitor is
screwed by a nut.

parts in the interior of this
valve become dirty or
stuck because of
residues.

Level control

container

(Air chamber)

Remove the srew to lift off

the level control container

for cleaning.

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The mounting for the thermostats is screwed at the right side of the air chamber. After its release, the
thermostats can be removed.

Heater element

After the removal of the nut and the heater clip in the sump under the fine strainer, the heater
element can be drawn forward through the chassis opening to remove..

Thermostats

Float switch

The float switch is snapped out with
a small screwdriver and can be
taken out of its mounting.
After removing the protective cap,
the microswitch can be snapped
out.

Programmer

The programmer is secured to the front of the
chassis by means of two screws.
Remove the programmer from the right side of the
chassis.

Switch unit

The switch unit is secured by means of screws and easily to
remove.

Inlet valve

The inlet valve is mounted in the same place as the float switch.
After the removal of the hose, the valve can be drawn out of the
chassis with suitable pliers.

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Here you can see how the hose
clamps can be re-tensioned with
wire cutting pliers.

Circulation pump

After loosening the screws of the holder, the circulation pump can be taken out
of the pump chamber.

Drain pump

To dismount the drain pump, the hose clamps are released and the screws removed.

After removing the drain pump
the tubing-bow with seals,
fitted in the pump chamber, is
accessible.

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Softener

1 To dismount the water

softener, these attachment
screws are removed.

2 The connections on the reed

switch are removed.

3 The hose connections are

detached.

4 The large nut of the salt hol

der must be released .

5 A spanner is useful in

removing the recycling inlet
nut.

6 Now the complete unit can be

removed.

Regeneration valve

After undoing the screws of the
recycling valve, this can be
removed.

1

2

4

3

5

6

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

The drain pump is always running if the water
prot device is activated.

If there is a leaking point and the water prot device is activated the
d-pump is running continuously.
There are no possibilities for the drain system to evacuate water
from the bottom tray, so when the d-pump has emptied the tub it
will still drain but without draining any water out: Customer
complaint, not draining?!
Even in this case the Service tech have to locate the leaking point
Leakages:

If the leakage point is located to the d-pump check:

- the two screws holding the d-pump on to the tub.

- the oring between the d-pump / tub (misaligned, distorted) ??

- the housing three screws on the d-pump.

If the leakage point is located to the d-pump check:

- the two screws holding the bracket / circulation pump in place.

- disassemble the circulation pump from the tup and check for
plastic burr in the tub / oring connection.

Leakages.

Service solutions:
Take of the cover to be able to see the Container on the left hand
side.
Let the dishwasher take in water and check the level.
If the level is too high (leakage through the top of the Container)

- adjust the pressure level switch

- check assembling ofthe Container to tub, misaligned oring or
screw not tightened.

- Check the Container it self (leakages between the welded base
and the Container walls)

Low water level.

Check ifthe Container is clogged. Clean it with hot water (after
disassembly it from the pressure level switch hose and the tub)
under a tap.
If the water level is to low, adjust the pressure level switch.

Water level

between 20 - 24 mm

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

In the case of leakage,
here more checkpoints

Check the locknut under the salt cap

to ensure it is fully tightened.

It should not be possible

to unsrew by hand.

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

16.

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Spares Operation - R.Kurzke 02/03 599 516 219 EN

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Spares Operation - R.Kurzke 02/03 599 516 219 EN