Electrolux DIVA User manual

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SERVICE MANUAL
DISHWASHERS
ELECTROLUX HOME PRODUCTS
ITALY S.p.A.
Spares Operations Italy
Corso Lino Zanussi, 30
Publication no.
I - 33080 PORCIA /PN (ITALY) 599 35 64-85
Fax [phone]
Edition: 2003-01-20
EN
Dishwasher with
EDW 1503 electronic
control system
(Functionalities)
DIVA 60 cm F.I.
(Totally integrated with
Prod. N. 911 936 ... )
Production:
ZM - Solaro (IT)

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CONTENTS
1 Purpose of this manual ........................................................................................................................... 5
2 PRECAUTIONS ...................................................................................................................................... 5
3 GENERAL CHARACTERISTICS............................................................................................................ 5
4 CONTROL PANEL.................................................................................................................................. 6
4.1 Control panel....................................................................................................................................... 6
4.1.1 ON/OFF button (S0)....................................................................................................................................6
4.2 Programme/Option buttons (S1÷S6) .................................................................................................. 6
4.2.1 Indicator LEDs (LD10÷LD12)......................................................................................................................7
4.2.2 Display ........................................................................................................................................................7
4.3 Washing programmes......................................................................................................................... 7
4.4 Options................................................................................................................................................ 8
4.4.1 “ 3 in 1 Tablet”.............................................................................................................................................8
4.4.2 Extra rinse (rinse +).....................................................................................................................................8
4.4.3 “1/2 load”.....................................................................................................................................................8
4.4.4 “Sanitize”.....................................................................................................................................................8
4.5 Delayed start....................................................................................................................................... 9
4.6 Modifying a programme .................................................................................................................... 10
4.6.1 Cancelling a programme (reset)................................................................................................................10
4.6.2 Modifying a programme ............................................................................................................................10
4.6.3 Interruption of a programme (pause) ........................................................................................................10
4.7 Power failure ..................................................................................................................................... 10
4.8 Buzzer............................................................................................................................................... 11
4.8.1 Activating/disactivating the buzzer............................................................................................................11
4.9 Sequence of operations.................................................................................................................... 12
5 STRUCTURAL CHARACTERISTICS................................................................................................... 13
5.1 Structure ........................................................................................................................................... 13
5.2 Hydraulic and functional characteristics ........................................................................................... 13
5.3 Hydraulic circuit................................................................................................................................. 14
6 ELECTRICAL COMPONENTS AND THEIR FUNCTIONS .................................................................. 15
6.1 EDW1503 Electronic control system ............................................................................................... 15
6.1.1 Functions of the circuit board....................................................................................................................15
6.1.2 Memory in the control system ...................................................................................................................15
6.2 Specifications for actuators and sensors.......................................................................................... 16
6.2.1 Components..............................................................................................................................................16
6.2.2 Sensors.....................................................................................................................................................16
6.3 Power supply and programme selection .......................................................................................... 17
6.3.1 “Beam on floor” function (certain models only)..........................................................................................17
6.4 Fill circuit ........................................................................................................................................... 18
6.4.1 Level and anti-overflow pressure switch ...................................................................................................18
6.4.2 Fill system.................................................................................................................................................18
6.4.3 Anti-flooding device...................................................................................................................................18
6.4.4 Intervention of the anti-overflow system....................................................................................................18
6.5 Control of water fill phase ................................................................................................................. 19
6.5.1 Static fill ....................................................................................................................................................19
6.5.2 Dynamic fill................................................................................................................................................19
6.5.3 Level stability control.................................................................................................................................19
6.6 Water fill time .................................................................................................................................... 19
6.6.1 Static fill time.............................................................................................................................................19
6.6.2 Dynamic fill time........................................................................................................................................19
6.6.3 Power supply interruption during water fill ................................................................................................19
6.7 Level stability during washing ........................................................................................................... 20
6.8 Washing system................................................................................................................................ 20
6.8.1 Control of the washing pump ....................................................................................................................20
6.9 Heating.............................................................................................................................................. 21
6.9.1 Integrated detergent dispenser .................................................................................................................21
6.10 Disactivating the rinse-aid function ............................................................................................... 22
6.11 Drain.............................................................................................................................................. 22
6.12 Regeneration system .................................................................................................................... 23
6.13 Resin washing ............................................................................................................................... 23
6.14 Regeneration levels ...................................................................................................................... 24
6.14.1 Setting the regeneration level ...................................................................................................................24
6.14.2 “Blending” function ....................................................................................................................................24
6.14.3 Table of regeneration values ....................................................................................................................25

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7
Drying.................................................................................................................................................... 25
7.1.1 “Turbo-dry” drying .....................................................................................................................................25
8 Automatic cycle..................................................................................................................................... 26
8.1 Turbidity sensor ................................................................................................................................ 26
8.1.1 Calculating the degree of soiling ...............................................................................................................26
8.1.2 Determination of the load..........................................................................................................................26
8.2 Automatic Programme ...................................................................................................................... 26
9 Alarms ................................................................................................................................................... 27
9.1 Table of alarms ................................................................................................................................. 27
10 Diagnostics mode / Options .................................................................................................................. 29
10.1 Accessing diagnostics mode......................................................................................................... 29
10.2 Reading the alarms and activating the individual components..................................................... 29
10.3 Cancelling alarm codes from memory / Testing the LEDs............................................................ 30
10.4 Functional testing cycle................................................................................................................. 30
10.4.1 Selecting the cycle....................................................................................................................................30
10.4.2 Cycle phases ............................................................................................................................................30
10.5 Options available to Service Engineers ........................................................................................ 31
10.5.1 Selecting the extra cold rinse option .........................................................................................................31
10.5.2 Disabling pulse washing ...........................................................................................................................32
10.6 Exiting diagnostics mode .............................................................................................................. 32
11 ELECTRICAL FUNCTIONS.................................................................................................................. 33
11.1 Electrical circuit diagram ............................................................................................................... 33
11.2 Basic circuit diagram ..................................................................................................................... 34
11.2.1 Key to circuit diagram ...............................................................................................................................34
11.3 Table of programmes .................................................................................................................... 35
11.4 Checking the efficiency of the components .................................................................................. 36
11.5 Measurement points on the board wiring connector..................................................................... 36
12 QUICK GUIDE TO THE SPECIAL FUNCTIONS................................................................................. 37

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1 Purpose of this manual
The purpose of this Service Manual is to provide Service Engineers, who already have the basic knowledge
necessary to repair household dishwashers, with technical information regarding dishwashers featuring the
EDW1503 electronic control system. These appliances are manufactured at Solaro (Italy).
The EDW1503 control system consists of a main circuit board and a control/display board. Both boards are
housed in a single plastic container.
This system is used in free-standing and partially integrated versions with “DIVA” 60 cm structures.
This Manual describes:
•General characteristics
•Control panel and programmes
•Technical characteristics
•Guide to diagnostics
For more detailed information regarding the hydraulic circuits and the structural characteristics of the
appliances, refer to the Service Manual for presentation of the “DIVA” structure (publication number 599 35 55–
25).
2 PRECAUTIONS
Electrical appliances must be serviced only by qualified Service Engineers.
Always remove the plug from the power socket before touching internal
components.
3 GENERAL CHARACTERISTICS
Power supply 230 V / 50 Hz (limits: 187−254 V)
Total power absorption 2300 W
Mains water supply Pressure Min. / Max. 5 −80 N/cm
2
Capacity 12 place settings
Dimensions:
-width 59.6 cm
-height 81.8 -87.8 cm
-depth 55.5 cm
Controls Horizontal / Vertical
-ON/OFF Two-pole switch (separate from the electronic board)
-Selection of programmes/options Button-actioned (min. 3, max. 6)
-Display Display 2,5 digits and LEDs
Washing system Combined / Pulse
Control of water level Pressure switch + Software
Water heating Tube-enclosed heating element (2100 W)
Temperature control NTC temperature sensor
Type of drying Active / Turbo
Safety devices / Alarms Total protection (hydraulic + Software

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4 CONTROL PANEL
4.1 Control panel
The configuration of the control panel depends on the following:
Number of programme selection buttons (from a minimum of 3 to a maximum of 6)
Number of LEDs (max.9)
4.1.1 ON/OFF button (S0)
The ON/OFF button is featured on all models in the range, and is used to switch the appliance on and off.
Switching off does not cancel the programme being executed.
4.2 Programme/Option buttons (S1÷
÷÷
÷S6)
The functions of the various buttons depend exclusively on the software configuration of each
appliance, which can feature from 3 to 6 buttons.
Also the selection of the washing programmes changes according to the configuration of each
appliance.
The buttons S1, S2, S3 are always featured because perform special functions.
MODELS WITH DIRECT SELECTION MODELS WITH SEQUENTIAL SELECTION
To each button corresponds a specific programme:
1. Open the door and switch the appliance on [S0]
All programme LEDs light
to indicate the selection
phase (except 3/1, if disabled)
2. Press a button to select a programme:
The relative LED remains on while the other
switch off.
The display shows the flashing time-to-end.
3. Set the possible option or the delayed start (if
available).
4. Close the door to start the cycle:
The digits light steady.
In these versions one or two buttons are featured to
select the programmes:
1. Open the door and switch the appliance on [S0]
The display shows [ -- ]
2. Press button [+] to select with an increasing
order:
The LEDs relative to the programme buttons flash
(if featured)
The display shows the last selected flashing
programme. Every time the button is pressed the
following programme is selected (increasingly): 1
2 3.....
3. Press button [- ] to select with a decreasing order:
The LEDs relative to the programme buttons light
(if
featured).
The display shows the last selected flashing
programme. Every time the button is pressed the
previous programme is selected: 76 5 .....
4. Set the possible option or the delayed start (if
available).
5. Close the door to start the cycle:
The digits light steady.

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4.2.1 Indicator LEDs (LD10÷LD12)
The functionalities of the LEDs depend on the configuration software of each appliance.
Salt: indicates that the salt reservoir is empty. If the level of regeneration is set to “1” (no
regeneration), this LED remains unlit at all times.
Rinse-aid: indicates that the rinse-aid reservoir is empty.
End of cycle: lights when the programmes has terminated.
4.2.2 Display
The display, which consists of 2,5 digits, can indicate:


The indicative time-to-end of the programme in minute. The countdown is carried out every minute and
updated at the end of each programme phase (when the programme is updated it can decrease by
more minutes at a time or stop for longer).


The end of cycle [0]


The possible delayed start time in hours (max 19h); the time decreases every
hour.


The selected regeneration level (during the regulation).


A possible alarm code in case of failure.


The condition of the special functions (no rinse-aid and).


The condition of the functions that the Service can select.
4.3 Washing programmes
The number and type of washing programmes depends on the configuration of the appliance.
Possible options
Type
Programme
Pre-wash
(ºC)
Wash (ºC)
N. Rinses
1/2 load
Sanitize
3 in 1
Rinse +

Min. ~
I1 Intensive 1 55 68 3 ⊗⊗⊗⊗122
I2 Intensive (maximum speed) 55 68 3 ⊗⊗⊗⊗120
I3 Intensive (short) 50 68 3 ⊗⊗⊗⊗88
N1 Normal Cold 68 2 ⊗⊗⊗⊗102
N2 Normal (maximum speed) Cold 68 2 ⊗⊗⊗⊗100
N5 Normal 3 Rinses Cold 55 3 ⊗⊗⊗⊗102
N3 Delicate Cold 55 2 ⊗⊗⊗⊗98
E1 Energy label Axx Cold 50 2 ⊗⊗⊗⊗162
E4 Energy label Short Cold 55 2 ⊗⊗⊗⊗134
E5 Energy
label Auto performance
(*)
Cold 65 max 2 ⊗⊗⊗⊗141
Auto 1
Automatic 50-65 (*) (Cold) 50-68 2-3 Auto
⊗⊗⊗92-115
Q4 Soak Cold -- (1) -- ⊗-- -- 12 (46)
Q5 Short 30 min -- 65 max 1 -- ⊗⊗⊗31
Q6 Heat plates -- -- 1 -- ⊗-- -- 30
Q7 Glassware -- 45 2 -- -- ⊗⊗73
(*) models with turbidity meter only.

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4.4 Options
4.4.1 “ 3 in 1 Tablet”
This option can be selected by pressing the corresponding button, and remains in memory until the same
button is pressed again. This option modifies the phases of the programme in order to optimize performance
when “3 in 1” detergent tablets are used:
variation of the duration of the programme and the temperatures required to dissolve the detergent
tablets.
reduction of water exchange (partial drain phases)
exclusion of introduction of rinse-aid
exclusion of regeneration / resin washing
4.4.2 Extra rinse (rinse +)
This option may be selected temporarily by pressing the button (if featured), or in “Service” mode. If this
option is set by the service engineer, it remains in memory until disactivated (see relative section).
This option adds one cold rinse (with pulse washing) with a duration of about 5 minutes.
4.4.3 “1/2 load”
The 1/2 load option optimizes the washing cycle when only a small load is placed in the appliance.
•1/2 load button
When this button is pressed, certain parameters of the selected washing cycle are modified:
Exclusion of Pre-wash (if featured)
Reduction of the washing temperature
Reduction of the duration of the programme (up to 36 minutes)
•Automatic 1/2 load
When this button is not featured on the control panel, certain programmes may feature automatic detection
of the half load. This system measures variations in the temperature during the initial heating phase. The
temperature and the duration of the wash are both reduced.
This option is not available in the following cycles: “Intensive”, “Short 30 minutes”, “Soak”, “Heating plates”
and “Glassware”.
4.4.4 “Sanitize”
This is a special option used to sanitize the dishes/cutlery. However, it is NOT compatible with the
“Glassware” programme.
During the final rinse, the temperature is maintained at 68°C for 10 minutes.
If used together with the SOAK option, the system performs a special sanitizing programme which lasts.
approximately 46 minutes (1 hot rinse followed by 10 minutes at a constant temperature of 68°C).

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4.5 Delayed start
Proceed as follows to select the delayed-start time:
1. Open the door and switch the appliance on by means of the S0 button
2. Press the button repeatedly to select the delayed-start time which appears flashing on the display.
The time increases every hour up to 19h [ 1 2 3 .....19  0.. ].
3. Select the programme and the possible options.
For some seconds the display shows the time-to-end of the cycle, then the delay time.
4. Close the door to activate the delay time:
The display lights steady and the countdown starts: the time decreases every hour [ 19 18 17... 1
0 ].
5. During the countdown, till the programme starts, it is possible to modify the delay time or cancel it.
6. After the delay time, the programme starts automatically.
The display shows the time-to-end of the cycle.
The delayed-start countdown can also be selected as follows:
1. Press button S0 to switch on the appliance.
2. Select the programme and the possible options.
3. Press sequentially the button to select the delay time.
4. Close the door to activate the delay time with the same procedure previously described.

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4.6 Modifying a programme
4.6.1 Cancelling a programme (reset)
To cancel a programme that has already started, proceed as follows:
1. Open the door carefully.
2. Press:
buttons S2 - S3 together for approximately 2 seconds (the LED corresponding to the cycle being
executed begins to flash).
or
if featured, the button “Cancel” for about 3 seconds (the LED of the button for selecting the
programme lights).
3. After about two seconds the display switches off: the programme is now cancelled and the appliance
returns to the selection mode (programme LEDs are on).
4.6.2 Modifying a programme
1. Until a cycle has actually started (digit with flashing light), the settings selected can be modified at any
time by pressing the appropriate buttons.
2. To modify a programme that has already started, first cancel it (see corresponding parag) and then
perform the new selections.
or:
3. Open the door carefully.
4. Press the button of the new programme for about 6 seconds, the LED of the current programme begins
to flash.
5. After about 6 seconds the LED of the old programme switches off and the LED of the new one lights: the
possible options are deleted and have to be selected again.
4.6.3 Interruption of a programme (pause)
Proceed as follows to interrupt a programme that has already started:
1. Open the door carefully and press S0 to switch the appliance off.
2. To re-start the cycle, press S0 again and close the door. The programme starts (after a brief delay) from
the point at which it was interrupted.
Important! If the appliance is switched off or if the door is opened for more than 30 seconds during
the drying phase, the cycle is considered to have been terminated after the regeneration phase;
when the appliance is switched on again, it returns to programme selection mode.
4.7 Power failure
The Power Failure function maintains the information relative to the cycle status even in the even of a power
outage; when the power supply is restored, the cycle resumes from the point at which it was interrupted.
If the power failure occurs during the drying phase, the cycle is considered to have been terminated after the
regeneration phase.

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4.8 Buzzer
The buzzer sounds to indicate the end of cycle and in the event of an alarm condition.
The buzzer sounds three times at the end of the cycle, but switches off immediately if the door is opened.
If the user prefers to switch off the buzzer, it is necessary to press a combination of buttons.
4.8.1 Activating/disactivating the buzzer
1. Cancel any cycles that have been selected (dishwasher in selection mode).
2. Press S0 to switch the appliance on.
3. Press buttons S2 and S3 at the same time until LEDs LD1, LD2 and LD3 begin to flash.
4. Press button S3: LEDs LD1 and LD2 switch off, while LD3 continues to flash.
The condition of the buzzer is indicated by the display: 1b buzzer on, : 0b buzzer off
5. Press button S3 again to disactivate/activate the buzzer
6. To store this operation in memory: press button S0 and switch the appliance off or wait 60 seconds, the
appliance is in selection mode (programme LEDs are on).

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4.9 Sequence of operations
1. Open the door to access the controls.
2. Press S0 to switch the appliance on.
3. Select the desired programme.
The display shows the time-to-end or the
programme no. flashing.
SELECTING THE CYCLE
4. Select the possible delayed start or the
desired option (if featured)
START
5. Close the door to start the cycle.
The digits light steady.
6. The time-to-end decreases every minute
and is updated after every cycle phase (not
visible from the user).
7. To interrupt a current programme:
Switch the appliance off with S0 (or open
the door)
To start it again, press S0 (and close the
door)
EXECUTION OF THE CYCLE
8. To cancel a current programme:
Press S2 – S3 simultaneously for about 2
seconds.
9. At the end of the programme:
The buzzer sounds at intervals.
The END OF CYCLE LED lights.
The display shows [0].
END
10. Press S0 to switch the appliance off.

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5 STRUCTURAL CHARACTERISTICS
5.1 Structure
The appliance as a whole may be considered as consisting of
four main assemblies:
BASE – DOOR – TUB – HYDRAULIC SECTION
The four assemblies are enclosed in a structure consisting of:
- A lower front panel (secured by two screws)
- Two lateral panels (secured by six screws).
5.2 Hydraulic and functional characteristics
Drying duct
Softener
Fill tank + condenser
Drain pump
Wash pump
Heater
Counterweight
Base
Sump
Turbo fan

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5.3 Hydraulic circuit
KEY
1 - Fill hose 11 - Anti-overflow pressure switch
2 - Fill hose with Acquacontrol 12 - Sump assembly
3 - Fill solenoid 13 - Wash pump
4 - Regeneration solenoid 14 - Tube-enclosed heating element
5 - Air-Break 15 - Drain pump
6 - Steam condenser 16 - Non-return valve
7 - Regeneration chamber 17 - Drain hose
8 - Salt Reservoir 18 - Drying duct / fan
9 - Resin Reservoir 19 - Anti-flooding device
10 - Level pressure switch

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6 ELECTRICAL COMPONENTS AND THEIR FUNCTIONS
6.1 EDW1503 Electronic control system
The EDW1503 control system consists of a main circuit
board and a control/display board. Both boards are
housed in a plastic container.
6.1.1 Functions of the circuit board


The circuit board receives signals relative to the cycle settings via the control/display board. The buttons
and LEDs are also mounted on this board.


The board also powers all the electrical components (solenoid valves, washing pump, detergent/rinse-
aid dispenser, drain pump, heating element, fan motor).


The board controls the temperature of the washing water via an NTC sensor, as well as the speed of
rotation of the washing pump according to the signal received from the tachymetric generator.


The circuit board monitors the status of the pressure switch and the rinse-aid/salt sensors.
6.1.2 Memory in the control system
The main circuit board features an EEPROM memory (external to the microprocessor) which stores in
memory data relative to the configuration, description of the cycle, cycle status in case of a power failure,
and any alarm conditions.
The configuration data (entered in the factory using a computer with a DAAS interface) determine the
functionalities of the appliance (number and type of programmes, options, LEDs etc.).
µ
P
ROM
RAM
EEPROM
(external
to the µP)
Asynchronous
external serial
port
Synchronous
internal serial p
Power Fail and
machine status
Configuration of
the appliance
Description of the
cycle
SENSORS
ELECTRICAL
LOADS
MAIN CIRCUIT BOARD
(Buzzer)
µ
P
DISPLAY BOARD
ButtonsLEDs Display

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6.2 Specifications for actuators and sensors
6.2.1 Components
TYPE OF COMPONENT POWER AVAILABLE TYPE OF ELECTRONIC
CONTROL
Wash pump Max 250W Triac
Drain pump Max 100W Triac
Heating element Max 2100W Relay
Water fill solenoid Max 10W Triac
Regeneration solenoid Max 10W Triac
Detergent and Rinse-aid solenoid Max 10W Triac
Fan motor Max 10W Triac
6.2.2 Sensors
TYPE OF SENSOR TYPE OF ELECTRONIC
SIGNAL
TYPE OF
COMPONENT
Salt sensor Digital 5 Volt Reed
Rinse-aid sensor Digital 5 Volt Reed
Temperature sensor Analogue 5 Volt * NTC
Turbidity sensor
(certain models only) Analogue 5 Volt Opto-electronic
Tachymetric sensor Frequency Tachymetric generator
Level sensor Digital - High voltage Pressure switch
Door closure sensor Digital - High voltage Switch
Anti-flooding sensor Digital - High voltage Switch
* NTC Temperature sensor
* NTC COMPARATIVE VALUES
Temperature
°C Nominal value
Ω
ΩΩ
Ω
10 9655
25 4850
60 1205
90 445

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6.3 Power supply and programme selection
The main board is powered by the closure of
contacts 1-5 and 2-4 of the ON/OFF button
(PU). The connectors used in this case are A2
(neutral) and B1 (line).
The control/display board (user interface) is
powered at 5V by the main board, making
programme selection possible.
When the door is closed, the main board
detects the closure of the contacts of the switch
(IP) across connectors B2-D1, and starts the
washing programme. The same switch powers
the electrical components.
When the door is opened, the power loads are
disconnected from the power supply and the
cycle is paused.
6.3.1 “Beam on floor” function (certain models only)
Certain models feature a special device
(beamer) installed between the door and the
inner door and connected to terminals E6, E4
and E3 on the circuit board.
This device projects a beam of red light onto
the floor and operates in the same way as the
end-of-cycle LED:
The beam remains lit when the end of the
cycle has been reached.
The beam lights intermittently to signal an
alarm condition.

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6.4 Fill circuit
6.4.1 Level and anti-overflow pressure switch
•The level of water introduced into the appliance is determined by
the level pressure switch (A)
•The anti-overflow pressure switch (B) ensures that the level of
water does not exceed the safety threshold (causing overflow from
the door).
6.4.2 Fill system
The water fill solenoid valve is powered by triac
TY2 on the electronic board (connector C7), by
the door switch (IP) and by the anti-flooding
microswitch (DA).
The level of water in the sump is monitored by
the pressure switch (RL). The electronic board
constantly monitors the status of the pressure
switch via a “sensing” line connected to
connector C5:


EMPTY if the contacts are closed on 1-2


FULL if the contacts are closed on 1-3
6.4.3 Anti-flooding device
Intervention of the anti-flooding device causes the contacts of the microswitch (DA) to open, thus
disconnecting the solenoid valve from the power supply.
6.4.4 Intervention of the anti-overflow system
If the anti-overflow pressure switch (PA) should
intervene, the closure of the contact on FULL
(1-3) powers the drain pump (PS). The pump
remains in operation until the contact returns to
EMPTY (1-2).
If the door is opened or the appliance
is switched off, the drain pump is
disactivated.
B
A

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6.5 Control of water fill phase
The quantity of water necessary to carry out the washing cycle is determined exclusively by the closure of
the electrical contact of the pressure switch, which changes from EMPTY to FULL. This system ensures
that, if the pressure switch re-opens on EMPTY, further water is introduced until it returns to FULL.
The water fill phase consists of the following sub-phases:
6.5.1 Static fill
With the motor switched off, the fill solenoid valve is energized and water is introduced into the appliance
until the pressure switch signal switches to FULL.
6.5.2 Dynamic fill
The dynamic fill is obtained by switching on the washing pump whose rotation causes the pressure switch to
switch to EMPTY. Subsequently, the fill solenoid valve is energized and water is introduced until the switch
returns to FULL.
The speed of rotation of the motor determines the quantity of water introduced, since the electronic control
system switches on the washing pump at a variable speed which depends on the washing system that will
be performed in the phases subsequent to the water fill:


In the case of “ctrl“ washing (at constant speed), the speed of rotation increases gradually to 2800 rpm


In the case of “pw“ (pulse) washing, the speed of rotation increases gradually to 1900 rpm
N.B.- Refer to the Table of Programmes for the definition of the washing system.
6.5.3 Level stability control
The hydraulic circuit operates with maximum efficiency when the pressure switch signal remains stable on
FULL. In practise, the quantity of water circulating in the sump allows the motor to run without speed
fluctuations caused by cavitation.
When the pressure switch signals FULL, the fill solenoid valve switches off.
6.6 Water fill time
The aperture of the solenoid valve has a pre-set overall duration, which is subdivided into the various sub-
phases of the fill:
6.6.1 Static fill time
T.S. = max 90 seconds: This is the maximum time within which the pressure switch must switch to FULL. If
the FULL signal is not received from the pressure switch within this time, the electronic control system
interrupts the washing cycle and the appliance enters alarm condition [1 0].
6.6.2 Dynamic fill time
T.D. = T.S. x 3: This is the maximum time allowed for the entire fill phase within which the pressure switch
signal must stabilize on FULL.
•If the pressure switch signal does not stabilize on FULL within this period (T.S. x 3), the electronic
control system switches off the fill solenoid (and the heating element, if switched on), and then allows
the washing cycle to proceed until it is completed. In this situation, the alarm condition [F 0] is not
displayed to the user, but may be accessed by the Service Engineer using a specific procedure.
•If, during a 2800 rpm dynamic fill, the pressure switch never closes on FULL during the initial 60
seconds, the electronic control system interrupts the washing cycle and the appliance enters alarm
condition [1 0].
6.6.3 Power supply interruption during water fill
If the water fill phase is interrupted by opening the door or due to a power failure, the contents of the
counters are stored in memory; when the door is re-closed or when the power supply is restored, the water
fill resumes from the point at which it was interrupted; the new counter values are added to those previously
memorized.

SOI/DT 2003 - 01 eb 20 599 35 64-85
6.7 Level stability during 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.
6.8 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 (3µF - 450VL).
The washing pump rotates in a counter-clockwise direction (seen
from the impeller side) and is fitted with a tachymetric generator.
In order to optimize the washing programmes, two washing systems
can be applied:
“ctrl“Washing at constant speed (2800 rpm) (maximum speed of the motor).
“pw“ Pulse washing at 1600 - 2800 rpm. This washing system is controlled by the electronic
control system, which actions the washing pump alternately at two speeds (minimum and
maximum speed) for short periods.
MOTOR SPEED PERIOD OF OPERATION
Maintenance 1600 rpm

4 sec
PW1 Pulses 2800 rpm

0.8 sec
The ctrl and pw speeds are configurable. For further details, refer to the cycles tables relative to the specific
model.
6.8.1 Control of the washing pump
The washing pump (PL) is powered by triac
TY4 on the circuit board (connector C3), by the
door switch (IP) and by the ON/OFF switch
(PU).
The main circuit board controls the speed of
rotation according to the signal received from
the tachymetric generator (T) connected to
connectors E1-E2.
This signal is used for:
Control of the washing system (ctrl or pw)
Control of the pump motor safety devices
and the relative alarms
Control of the dynamic fill