Electrolux COMPACT MIDI + EDW 500 User manual

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SparesOperation-R.Kurzke02/05 599521 951 EN
SERVICE MANUAL
© AEG Hausgeräte GmbH
Muggenhofer Straße 135
D-90429 Nürnberg
Germany
Fax [phone]
Spares Operation
Publ.-Nr.:
599 521 951
02.05
EN
Edition:
DISHWASHER
COMPACT
MIDI + EDW 500
Dishwasher
COMPACT
MIDI + EDW 500

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SparesOperation-R.Kurzke02/05 599521 951 EN
Index
1. Technicaldata/Dimensions/Installationwaterdrainage............................ 3
2. Programs ................................................................................................... 4
3. Components............................................................................................... 5
InterferenceFilter........................................................................................ 5
PressureSwitch ......................................................................................... 5
FlowHeater................................................................................................ 5
CirculationPump ........................................................................................ 6
DrainPump ................................................................................................ 6
NTCTemperatureSensor........................................................................... 6
Electronic ................................................................................................... 6
Detergent / Rinse Aid Combination Dispenser Unit.................................... 7
WaterSoftening.......................................................................................... 8
SettingofwaterSoftening........................................................................... 9
4. Positionof Components ........................................................................... 10
5. WaterCourse Scheme ............................................................................. 11
6. Leakage Protection .................................................................................. 12
Safetylevel ............................................................................................... 12
7. WaterInlet ................................................................................................ 13
8. Staticfilling ............................................................................................... 13
9. Washing ................................................................................................... 14
Circulationsystem .................................................................................... 14
Heating..................................................................................................... 14
10. Regeneration............................................................................................ 15
11. Rinseoutafterregeneration...................................................................... 16
12. Antisifon .................................................................................................. 16
13. Drain ........................................................................................................ 16
14. In-andOutputelements ............................................................................ 17
Positionofpushbuttons,LEDsandlamps ................................................. 17
15. Servicemenu ........................................................................................... 18
Servicefunctions ...................................................................................... 18
16. Overviewerrordisplays ............................................................................ 19
17. ServiceTips/ Replace of components............................................... 21 - 27
18. Wirings..................................................................................................... 28
19. MeasurementPoints................................................................................. 30

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Compact dishwasher MIDI
Washprograms: Intensive70,
Normal65,
Normal Bio 50,
Quick50,
Prewashextra
Heating: flowheater
Energie Water
Intensiv 70°C: 1,15kWh 9 l
Normal65 °C: 0,80kWh 7 l
Normal Bio 55 °C: 0,63kWh 7 l
Quick 50 °C: 0,40kWh 6 l
Glas 40 °C: 0,39kWh 6 l
Installation water drainage
Placethedischargehoseoverthesinkasillustrated.
It may not at any point be higher then 75 cm over the surface
whichthedishwasher isstandingon.Ifrunshigher,operation of
thedishwashermightbeimpaired.
Itisalsoimportanttoensurethattheinsidediameterofthehose
isnot less than13mmat any point.Ifthedischarge hose is too
longit can easily be cut to the rightlength.
Cutthe hose to a suitable length, using a sharp knife.
Fittheelbowsuppliedontotheendofthehose.
Volt: 230 V
Frequency: 50Hz
Heatungelement: 1100 W
Connectedload: 1200 W
Fuserequired: 10 A
Height: 447 mm
Width: 546 mm
Depth: 480 mm
Noise: 49 dB
Waterpressures: min. 80 KPa (0,8 bar)
max. 1000 kPa (10 bar)
Inlethoselength: 130 cm
Outlethoselength: 130 cm
Cordlength: 170 cm
1. Technical data / dimensions Typical features for use

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2. Programs

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3. Components
InterferenceFilter
Theinterferencefilterisconnectedintheterminal
boardparallel to themainsfeed.
Pressure Switch
Thepressureswitchcontrolsthewaterlevel.
Withoutwater,contactisclosed.
fN Switchpointwithlevel 45 mm Ws
Resetpointwithlevel 10 mm Ws
Thepressureswitchisnotadjustable.
Flow Heater
Theflowheaterheatsthewatertotherequiredtemperature.
Duringthewashcycle,wateriscontantlypassingthroughthe
flowheater.
Poweroutput 1100 W
Resistor 45 Ω
Protector 98 °C ± 5 K
Thermalfuse 260 °C

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Circulation Pump
Thecirculationpumpisdrivenbyanasynchronousmotor
withanauxiliarywinding.
Theauxiliarywindingistincircuitwitha2,5uF capacitor.
Speedfor rinsing:
2800 1/min
Drain Pump
Thedrainpumpisdrivenbyasynchronousmotor.
Poweroutput26W.
Pumprate15l/min.
NTC-Temperaturfühler
Temperature sensor NTC-resistor
Temperatur/Widerstand
20 °C
/
6032
Ω
temperature/resistor
25 °C
/
4829
Ω
(nur bei vollelektron.
30 °C
/
3891
Ω
Geschirrspüler)
40 °C
/
2573
Ω
(only for fully electronic dishwasher)
50 °C
/
1741
Ω
55 °C
/
1444
Ω
60 °C
/
1204
Ω
65 °C
/
1009
Ω
70 °C
/
849
Ω
NTC-Temperaturfühler
Electronic
Onelectronicmodels,amicroprocessorcontrolsall
components,thisisdoneusingtriacs.Theelectronicalso
memorizesallprogrammedata.
Theheatingisswitchedbyarelayontheelectronicboard.

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Detergent / Rinse Aid Combination Dispenser Unit
Dosingof detergent prewash 10 ml
wash 20 – 30 ml
Dosing of rinse-aid position 1 – 6 2 ml – 7 ml
Capacity 140 ml
Thedetergentdispenseris
activatedby a release coil.
Thefirstoperationaddsthe
detergent,andthesecondthe
rinseaid. If the dooris opened,
thelatching barisreset tothe
detergentdosageposition.
display“lackofrinse-aid”
dosingofrinse-aid
maximumfillinglevel
outletofrinse-aid
detergenttray
detergenttrayforprewash
Thedetergentcompartment1isfillingcorrespondingtothe
setdosingquantitywhenthedoorisopen.Possiblyexisting
rinse-aid in compartments 2 and 3 flows back into the
storagetank of the rinse-aid. Thedetergent trays arefilled
up.Thedoorwillbeclosedandthedetergentforprewashwill
be rinsed out through the slots in the detergent dispenser
cover.
During the washing cycle the coil is switched on and the
detergent compartment cover releases the detergent. The
rinse-aidflowsfromcompartment1intocompartment2.
Afterswitchingoffthecoil,therinse-aidflowsfromcompartment
2intocompartment3.
coil on
off time
coil on
off time
coil on
off time
coil on
off time
Duringthe rinse cycle,thecoil will be switchedonwhen the
rinseiswarmedandtherinse-aidrunsfrom compartment3
intotherinsetank.Atthesametime,theremainingrinse-aid
(15%)runsfromcompartment1intocompartment2.

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Water Softening
Thecomponentsrequiredforwatersoftening.
1. softenerunit
2. regenerationdosagechamber
The incoming water flows through the softener which works
accordingto the ion exchange principle. Theionexchangeris
filled with small epoxy resin balls. The resins exchange the
hardness constituents (calcium and magnesium), for sodium
ions.
When all the sodium ions are used up, it is necessary to
regeneratethesoftener.Thisisdonebyflushingabrinesolution
throughthesoftener.
Afterwards the softener is washed out with fresh water and is
nowfullyeffective.
Dependingonthewaterhardness,regenerationisonlynecessary
afterseveralwashcycles.
Thesofteningsystemisdesignedforawaterhardnessofupto
50°dH.
With the coil switched off, the rinse-aid flows from
compartment2intocompartment3.
Duringthe rinse cycle, thecoilisalways switched on
twice. When it is switched on the second time, the
remainingrinse-aidflowsintotherinsetank.
coil on
off time
coil on
off time

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Customers menu: Water hardness
With this procedure it is possible to modify the regeneration level selection (depending on the water
hardness).
Regeneration selection
To activate the function:
1. Press and hold down button S1.
2. Turn the knob to Position 1:
- The LEDs LD0 and LD1 flash
- Release button S1
3. Press button S1
- The regeneration level is displayed by the End of cycle
LED which flashes and pauses at intervals: for the
decodification, see summary table of alarms.
Press button S1 to increase the regeneration level
according to the following values:

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1
2
Geräte...
1- ohne Enthärter
2 - mit Enthärter
4. Position of components

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5. Water Course Scheme

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6. Leakage Protection
The anti-flood switch in the base tray will activate the drain pump and drain the water from the tub in
the event of an internal leakage.
If the float switch is activated, all electric components are switched off except the drain pump.
Overflow protection
The filling phase fills up to the level, monitored by a pressure monitor. If the pressure monitor does
not switch in, this filling phase is generally limited electronically to 2 minutes.
If the pressure monitor has not switched in by then, the electronics jump to the error mode "shut off
tap", and the program is stopped.
If the pressure monitor switches back during the cycle, a maximum of 10 sec. further filling is
possible. If the pressure monitor has not switched in by then, the electronics jump to the error
mode "shut off tap", and the program is stopped.
Safety level
If the safety level is reached by over-fillling more than 3,2 litres, floater switch starts the drain
pump.
Safety level

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Power supply interruption during water fill
Ifthewaterfillphaseisinterruptedbyopeningthedoororduetoapowerfailure,the
contentsof the counters are stored in memory; when thedoorisre-closedorwhenthe
powersupply is restored, the water fill resumes from the point at which it wasinterrupted;
thenew counter values areaddedtothose previously memorized.
8. Static filling
- Staticfillinguntilpressureswitchpoint.
failurecode:
Ifthis pointisntreached aftermax.2 minutes, afailurecode isdisplayedand thepro-
gram is stopped.
7. 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 chamber built into the sump operates the pressure switch.

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9. Washing
Once the fill phase has been completed, the cycle proceeds to the washing phase. The washing phase is
carried out using cold or heated water, and the status of the pressure switch is monitored constantly to
ensure that the hydraulic system functions correctly. Water replenishment cycles may be performed if
necessary.
If the pressure switch returns to EMPTY during the washing phase, the fill solenoid is energized for a
maximum time equivalent to T.S. x 3 (maximum allowable total fill time).
If this time is exceeded, the washing cycle is completed, but no further supplementary fills are
performed. In this situation, alarm condition [F 0] is stored in memory. This alarm code is not displayed to
the user, but can be accessed by the Service Engineer using a specific procedure.
Washing system
The appliance features the classic washing system in which the mechanical washing action is obtained
by the rotation of the washing pump which, by ducting water into the hydraulic circuit, actions the two
spray arms simultaneously.
The washing pump is actioned by an asynchronous motor with a start-up capacitor (2,5µF).
The washing pump rotates in a counter-clockwise direction (seen from the impeller side).
Heating
The heating element is enclosed in a protective tube, and is used to heat the washing water (but does not
switch on during the drying phase). The heating element is fitted to the outlet of the washing pump and
connected to the duct which feeds the upper spray arm.
The heating element is powered by electronic control and by the level pressure switch, which must be
set to “FULL” (contact closed on 1-3).
The temperature of the water is controlled by the main circuit board via an NTC sensor.

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10. Regeneration
The water chamber for regeneration contains 230 ml water. During regeneration, the regeneration valve
is energized. The 230 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.
Regeneration of the water softening system, which takes around 4 min, is usually performed at the start
of the drying phase.
Every time regeneration is performed (with activation of regeneration solenoid 4), the accumulation
chamber is completely emptied of its contents (about 230 cc of water). Regeneration is controlled by the
electronic control system “Ad Hoc”, i.e. not at each washing cycle, but rather at intervals determined by
the level of regeneration selected:
- If level [1] is selected, regeneration is never performed and the SALT LED (if featured) always remains
unlit.
- If level [10] is selected, regeneration is performed twice during each cycle; first at the end of the
washing phase, and then at the beginning of the drying phase.
The regeneration solenoid is powered on the main board and by the contacts of the door switch.
Some models may feature a salt sensor, whose Reed contact is connected to the board.
When there is no salt, the contact closes and the relative LED lights up (on display board).

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13. Drain
At the end of the drain phase, a control procedure is performed to check that the contact of the level
pressure switch is open on EMPTY. If this is the case, the appliance proceeds to the subsequent phase.
If, as a result of a problem in the drain phase, the pressure switch contact remains closed on FULL
(i.e. if there is water in the hydraulic circuit), the drain phase is repeated.
On completion of this second drain phase, the status of the pressure switch is again checked. If it is still
closed on FULL, alarm [i20] is generated (failure to drain). The time-out for each of these two phases is
120 seconds.
N.B. The washing programmes always begin with a drain phase.
11. Rinse out after regeneration
Recyclingtakes place after the rinsing
process,asthefinalstep.
Rinsingoutthenfollows automatically
withthe start ofthenextwash program.
Thepumping off stageusuallytakes
about50seconds.
12. Antisiphonic device
Ifthe end of the take-off hose is below the level of
thewaterinthe wash space, a siphon effect is
possible,that is, the machine runs empty.This is
avoidedby theventilationthrough the anti-siphon
valve.
pump 30 sec
1. fill & pump 8 sec.
pump 15 sec.
2. fill & pump (wh 1 + 2) 8 sec.
pump 15 sec.
3. fill & pump 8 sec.
pump 30 sec.

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14. In- and Output elements

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15. SERVICE MODE
With this procedure it is possible to access the Service Diagnostics System. Once this mode is
accessed, it is possible to:
- read and cancel the alarms
- control the operation of the various components of the appliance
- start the Service diagnostics mode
Reading the alarms and activating the individual components
To activate the function:
1) Press and hold down the button S1.
2) Turn the knob anti-clockwise till Position 5:
- The LEDs LD0 and LD1 flash.
- Release button S1.
- Press button S1.
- the first memorised alarm is displayed: the End of
cycle LED flashes and pauses: for the decodification,
please refer to table of alarm codes.
4) Press again button S1 to display the second alarm.
5) Pressing button S1 again, the third alarm is displayed.
6) Pressing button S1 for the fourth time, the appliance
actuators are activated:
- 4th actuation: regeneration solenoid
- 5th actuation: drain pump
- 6th actuation: water fill solenoid and washing pump
(water up to level)
- 7th actuation: heating (only if water up to level)
- 8th actuation: washing pump
- 9th actuation: detergent/rinse-aid dispenser
- 10thactuation:
- 11th actuation: it starts again from the first alarm
All positions can be repeated pushing button S1 sequentially.
The components are powered with door closed.
If button S1 is not pressed for 60 seconds, the diagnostics terminate automatically.
Cancelling alarm codes from memory / test of LEDs
It is good practise to cancel the alarm memorised:
- after reading the alarm code, to check whether it is repeated
during the diagnostics test.
- after repairing the appliance, to check whether it is repeated
during the testing cycle.
To activate the function:
1) Press and hold down button S1.
2) Turn the knob anti-clockwise till Position 5:
- the LEDs LD0 and LD1 flash.
- release button S1.
3) Turn the knob till Position 4.
-press button S1.
- all LEDs start to flash for 30 seconds.

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Functional testing cycle
This is an abbreviated washing programme (50 min) which allows the Service Engineer to test all the
functions that comprise a traditional washing cycle; in effect, the system simulates a normal cycle.
Selecting the cycle
To activate the function:
1. Press and hold down button S1.
2. Turn the knob anti-clockwise till Position 5.
- the LEDs LD0 and LD1 flash.
- release button S1.
3. Turn the knob till Position 3
-press button S1.
- the programme starts: the programme behaves as in
a normal cycle; the PAUSE and CANCEL options are
accessible.
Exiting Service and User modes
To exit these modes, turn the knob to OFF position and switch the appliance off or wait 60 seconds:
the LEDs light up and the appliance returns to selection mode.

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16. Alarms
Whenanabnormal situation occurs that mayinterfere with machine functioning, themainboard activates a safety
system which in most cases interrupts the washing cycle. The last three alarm situations are stored in memory.
Using a special procedure, service personnel can display all the alarms stored in memory. The user is only shown
fourofthe alarmsinprogress.
TheEND OF CYCLELED flashes repeatedly.
Type of
Alarm
No. flashes
of end-of-
cycle LED
Displayed
to the user
Description of the alarm condition Machine status Possible causes
i10 1yes
Water fill time-out (The pressure
switch does not close on FULL after
90 sec. static fill, or never closes on
“FULL” during the initial 60 sec of
the dynamic fill at 2800 rpm)
The drain pump switches on,
then the cycle stops
Tap closed; water mains pressure too low
;
fill solenoid / wiring faulty; hydraulic circui
t
of pressure switch obstructed; level
pressure switch / wiring faulty; circuit board
faulty
i20 2yes
Water drain time-out (The pressure
switch does not return to EMPTY
after two drain phases lasting 120
seconds)
The drain pump switches on,
then the cycle stops
Drain circuit obstructed/blocked; drain
pump interrupted or jammed (foreign
bodies); level pressure switch blocked on
FULL (1-3); hydraulic circuit of pressure
switch obstructed; wiring faulty; circuit
board faulty
i30 3yes
Intervention of Anti-flooding system
(the drain pump switches on)
The cycle is interrupted and the
drain pump switches on
Water leakage from the tub - sump and
various connections (pump, upper spray
arm duct etc.). Floating sensor blocked
mechanically. Microswitch faulty. Fill
solenoid blocked mechanically. Circuit
board faulty (solenoid triac short-circuited
)
i50 5yes
Motor triac short-circuited (the
washing pump runs uncontrolled at
maximum speed)
Water fill to level (if necessary),
deactivation of the other
actuators, cycle interrupted.
The washing motor runs at
maximum speed and the alarm
is displayed.
Circuit board faulty
i60 6no
Heating Time-out (the check takes
place every 3 minutes: the
temperature must increase by a
certain amount at each step)
The programme continues to
the end without heating (the
washing result will probably be
unsatisfactory)
Heating element faulty; intervention of
safety thermostats (open); wiring faulty;
NTC sensor (poor thermal contact);
insufficient water circulating in the tub;
washing pump faulty(impeller stripped);
circuit board faulty.
i70 7 no NTC sensor short-circuited or open
The programme continues to
the end without heating (the
washing result will probably be
unsatisfactory)
NTC sensor faulty; wiring short-circuited
/
open; circuit board faulty.
i80 8no
Communication error between the
microprocessor and the EEPROM Machine inoperative: no selection possible (*) Circuit board faulty.
i90 9no Problems with software
configuration
The fault occurs when
switching on: no selection
possible (*)
Circuit board faulty (configuration softwar
e
incorrect).
ib0 11 no Problems with the turbidity meter [if
featured] (Calibration Time-out)
The programme continues as if
a “heavy soiling” condition had
been detected.
Turbidity sensor faulty; sensor wiring faulty;
circuit board faulty.
id0 13 no
Problems with the washing motor:
no signal from the tachometric
generator (washing pump powered,
but no signal from the generator)
The heating element is
switched off. If the fault persists
after the Time-out, the washing
pump operates at maximum
speed and the alarm code is
stored in memory (the cycle
continues)
Motor winding interrupted / short-circuited
;
motor jammed (foreign bodies); wiring to
washing motor faulty; motor capacitor
faulty; Tachometric generator interrupted
/
short-circuited; circuit board faulty.
iF0 15 no Water replenishment Time-out (3
times during the T.S. Time-out)
The cycle continues until the
next phase without
supplementary fills and without
heating. The error is cancelled
on completion of a drain phase.
Dishes upside-down; central filter clogged;
excessive foam; leaks from the sump-
pressure switch coupling; pressure switch
faulty / false contacts.