Zanussi Ls3 Manual

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7. SAFETY FEATURES - CONTROLS - ALARMS
Dishwashers with electronic control systems include a number of safety features which protect the
components whether the appliance is switched off or in operation
7.1 DEFINITION
In the event of a fault that might affect the operation of the appliance, the electronic control system
activates a specific safety device; in most cases, this immediately activates a Time-out which interrupts
the washing cycle.
The alarm situation is displayed on the control panel (one or more LEDs flash).
SAFETY FEATURES / ALARMS
SAFETY FEATURE ALARMS
LEDs LITWASHING
CYCLE
Reference
codeDefinition LEDs FLASHINGVisible to
userIn
memoryInterruption
[AL5] Time_out  Water fill[LD9]YES YES YES
[AL6] Time_out  Drain[LD10]YES YES YES
[AL4] Intervention of anti-flooding device[LD9 + LD10]YES YES YES
[AL3] Time_out  Heating[LD11]NO
YESNO
[AL1-2] NTC sensor (open or short-circuited)[LD9 + LD11]NO
YESNO
[AL7] Motore Stopped[LD10 + LD11]YES YES YES
[AL8] Motor triac (Short-circuited)[LD9 + LD10 + LD11]YES YES YES
7.1.1AL ARM CONDITION
If one of the following ALARM codes is displayed: - [AL4], [AL5], [AL6], [AL7], [AL8]
The appliance is OFF – The washing cycle is interrupted.

One or more LEDs on the control panel flash to indicate the alarm condition.

example:- LED [LD9] flashing = intervention of W ater Fill Time_out [AL5].

All LEDs (with the exception of the Programme LED for the current cycle) switch off.

All the keys – including CANCEL – are disabled.

To reset the alarm condition, press [S0] to switch the dishwasher off
When [S0] is pressed to switch the appliance on again, the programme resumes from the point at
which it was interrupted; if the fault persists, the dishwasher returns to the alarm condition.
7.1.2AL ARM CONDITION
If one of the following ALARM codes is displayed: - [AL1/2], [AL3]
The dishwasher remains in operation – The Washing cycle has ended

No alarm condition is displayed on the control panel.

The cycle is completed normally, but the heating phases are bypassed The user may report poor
washing results and a short washing time.

In these cases, the alarm condition is stored in memory, and may be displayed only by Service
Engineers.
N.B.: In all cases, the electronic control system stored the last 3 alarm conditions in memory; these
may be checked using a special procedure (see paragraph 7.2 below). 
						

							TSE-P  02.01  LF 22/35 599 34  60-32 7.2 DISPLAYING ALARM CONDITIONS STORED IN MEMORY
This procedure can be performed by service engineers only in order to check for any alarm conditions
stored in the memory of the electronic control system.
The procedure is accessed by pressing a combination of keys, and enables the service engineer to
identify the fault (whether currently existing or occurring previously).

The Alarm condition stored in memory is indicated by LEDs [LD9], [LD10], [LD11] (flashing)
according to a binary coding system described in the Alarm Table (paragraph 7.1 above).

Press [S1] repeatedly to display the alarms in sequence.

The last 3 alarm conditions stored in memory can be displayed.
7.2.1CHECKING THE ALARM CONDITIONS STORED IN MEMORY
Door closed – Dishwasher switched OFF:
1.Press and hold down keys [S2] & [S3
]
simultaneously.
2.Press the ON key [S0].

LEDs [LD1], [LD2], [LD3]  immediately
begin to flash to indicate that the
function has been selected.
3.Press [S1] to start the procedure.

LED [LD1] flashes during the test procedure.

The last alarm condition stored in memory is indicated by LEDs [LD9], [LD10], [LD11].
Press key [S1] repeateadly; the 2nd and then the 1st alarm condition will be displayed in
sequence.
To exit the procedure, press [S0] to switch off the appliance.
7.3 CANCELLING THE ALARM CONDITIONS STORED IN MEMORY
This procedure enables service engineers to cancel the alarms stored in memory in order to avoid
possible doubts or confusion in the event of a subsequent service call.

It is advisable to perform this procedure after checking the alarm conditions stored in memory.
7.3.1CANCELLATION PROCEDURE
Door closed – Dishwasher switched OFF
1.Press and hold down keys [S2] & [S3
]
simultaneously
2.Press the ON key [S0]

LEDs [LD1], [LD2], [LD3] flash to
indicate that the procedure has been
selected.
3.Press [S3] to start the procedure.

The alarms stored in memory are immediately cancelled.

All the LEDs on the control panel [LD1 … … LD14] switch on simultaneously for one second.

The LEDs light again twice at intervals of 2 seconds.

On completion, the system exits the procedure automatically.
Press [S0] to switch the dishwasher off. 
						

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7.4  DESCRIPTION OF SAFETY FEATURES AND ALARMS
7.4.1WATER FILL TIME-OUTALARM  [A L 5] Led [LD9]
This Time-out is activated only during the water fill phases.

The control system definitively switches off the fill solenoid valve.

Counting of time “T” starts when the solenoid valve opens and ends when the signal from the
pressure switch stabilizes on “full”.

The maximum time for aperture of the fill solenoid (“T”) is 4 minutes for the entire fill phase; if this
time is exceeded, an alarm condition is generated.
Possible causes:
a. Water tap closed
b. Mains water pressure 
						

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7.4.3ANTI-FLOODING CONTROL SYSTEMALARM  [A L 4] Leds [LD9] + [LD10]
This control system is operative during the washing phases only, and not in the water fill phases, in
which case is it connected to the safety device (see paragraph 7.4.1 “W ater Fill Time-out”).

A float-actioned mechanical sensor positioned on the bottom of the appliance trips a microswitch
which is connected in series to the fill solenoid, thus disconnecting the solenoid.

Intervention of the sensor is detected by the electronic control board, which actions the drain
pump for 1 minute, after which an alarm condition is generated.
Possible causes:
a. Water leakage from the tub/sump seal
b. Water leakage from the various couplings (washing pump, duct to the upper spray arm, etc.)
c. Floating sensor jammed mechanically/microswitch faulty
7.4.4HEATING TIME-OUTALARM  [A L 3] Led [LD11]
The maximum heating time for the water is 45 minutes; if the correct temperature is not reached
within this time, an alarm condition is generated.
Possible causes:
a. Heating element broken
b. Safety thermostat intervention (open)
c. Wiring interrupted / loose
d. NTC sensor faulty (poor thermal contact)
e. Insuffient water circulation in the tub
f. Washing pump faulty (washing impeller damaged)
7.4.5NTC TEMPERATURE SENSORALARM  [A L 1-2]  Leds [LD9] + [LD11
]
This alarm is operative after the initial water fill phase of the cycle until the end of the final wash
phase.

The impedance of the NTC sensor is monitored constantly.

If the impedance should not be within the correct limits as determined by the
impedance/temperature conversion performed by the electronic control system, the alarm
condition is generated.
7.4.5.1 NTC SENSOR SHORT-CIRCUITED
If the impedance is too low (T = / > 85°C).
Possible causes:
a. Sensor faulty / short-circuited
b. Wiring short-circuited
c. Temperature too high (> 85°C)
7.4.5.2 NTC SENSOR OPEN
If the impedance is too high (T = / < - 5°C).
Possible causes:
a. Sensor faulty / circuit open
b. Wiring interrupted / loose
c. Temperature too low (< -5°C) 
						

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7.4.6MOTOR INOPERATIVEALARM [A L 7] Leds [LD10] + [LD11]
This control system is operative during the entire washing cycle.

Jamming of the motor is detected by the tachimetric sensor; this also makes it possible to check
for a faulty tachimetric sensor using the following procedure.

When the motor is switched on, it must reach a speed of 2000 rpm within 5 seconds
; if this does
not occur, an alarm condition is generated.
Possible causes:
a. Motor winding interrupted / short-circuited
b. Motor jammed (foreign bodies / pump unit)
c.  Electrical connections broken / loose
d.  Capacitor interrupted/short-circuited
e. Tachimetric sensor broken / short-circuited
To check that the tachimetric sensor functions correctly:

Check that the voltage across the terminals of the sensor is higher than 7V AC.
7.4.7WASH MOTOR TRIAC SHORT-CIRCUITEDALARM  [A L 8] Leds [LD9] + [LD10] +[LD11]
This control system is operative during the entire washing cycle.

The electronic control system identifies that the motor is correctly powered and detects the
reason for a malfunction.

If the microprocessor identifies a signal from the tachimetric sensor indicating that the motor is in
operation when it should be switched off, an alarm condition is generated.
Possible causes:
a. TRIAC on control board short-circuited

Replace the control board. 
						

							TSE-P  02.01  LF 26/35 599 34  60-32 7.5 SUPPLEMENTARY SAFETY FEATURES
7.5.1ANTI-PRESSURE SURGE
Pressure surge sometimes occurs during the hot wash phases when operation of the motor is
resumed after the cycle has been interrupted.

This phenomenon may result in excessive noise, rattling of the dishes and slight leakage of
water from the door seal.

The electronic control system performs a procedure which prevents this phenomenon by
controlling the operation of the motor.

The control procedure consists of a phase (duration 20 seconds) during which the motor rotates
at a constant speed of 1600 rpm; during this period, the remaining loads (i.e. the heating
elements) are switched off.

This procedure takes place only during washing phases (motor in operation), when the cycle is
restarted after a power failure or after opening the door.
7.5.2DOOR OPEN
A high-voltage sensor connected to the door microswitch performs this function.

When the door is opened, all electrical loads are disconnected (motor, heating element, etc.) and
the electronic control board identifies the door open condition; the phase being performed is
interrupted and stored in memory.

When the door is re-closed, all the electrical loads are reconnected; operation of the dishwasher
resumes from the beginning of the phase which was interrupted.
7.5.3POWER FAILURE

The electronic control system recognizes a power failure condition, and memorizes all the
settings and the current phase in the EEPROM for an unlimited period.

When the power supply is restored, operation of the dishwasher resumes from the beginning of
the phase which was interrupted.
7.5.4CURRENT PROGRAMME
When the cycle has started, the electronic control system recognizes the Programme in execution
condition, and disables all the control keys (with the exception of the CANCEL key) in order to
prevent inadvertent modification of the settings.
7.5.5CONTROL OF SALT LEVEL
This control system consists of a reed sensor which positioned on the exterior of the salt container
and actioned by an internal float.
7.5.6CONTROL OF RINSE-AID LEVEL
This control system consists of a reed sensor which positioned on the exterior of the integrated
detergent dispenser and actioned by an internal float. 
						

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8.ELECTRICAL FUNCTIONS
8.1 CIRCUIT DIAGRAM 
						

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							TSE-P  02.01  LF 29/35 599 34  60-32 8.3 TABLE OF WASHING PROGRAMMES
The table lists all the programmes stored in memory. The codes (A, B etc.) identify the programmes assigned (max. 5) to the individual appliances.
Pre-wash Main washFirst
rinseSecond
rinseHot rinse Drying




 

Plant
Programmes
Resin wash
(option)
Temperature
Time after
temperature
Washing type
Drain
Resin wash
(option)
Temperature
Time after
temperature
Temperature
Time after
temperature
Washing type
Drain
Time
Washing type
Drain
Time
Washing type
Drain
Temperature
Time after
temperature
Washing type
Drain
Regeneration
 (option)
Drying time
Time to end (min)
A
Intensive 70°
1’ 55°C
∆T + 5puls_1 N --- 50°C
∆T + 570°C
∆T+ 10puls_1 N 5 puls_2 N 5 puls_2 N 68°C
∆T + 2puls_1 N 2 12’94
N
Intensive 70° - Italy
1’ 55°C
∆T + 5ctrl N --- 50°C
∆T + 470°C
∆T+ 12ctrl N 5 ctrl N 5 ctrl N 68°C---
ctrl N 2 12’106
B
Normal 65°
1’ 40°C
∆T + 5puls_1 N --- 50°C
∆T + 465°C
∆T + 8puls_1 N 5 puls_2 N -- --- -- 68°C
∆T + 2puls_1 N 2 12’91
O
Normal 65° - Italy
1’ 55°C
∆T + 5ctrl N --- 50°C
∆T + 468°C
∆T + 6ctrl N 5 ctrl N 5 ctrl N 68°C---
ctrl N 2 12’100
C1
Bio 50º (ABC)
1’ --- 8 puls_1 N --- 48°C
∆T + 248°C
(14)∆T+ 20puls_1 N 5 puls_2 D -- --- -- 56°C
∆T + 2puls_2 N 2 50’122
C3
Bio 50º (BAC)
1’ --- 8 puls_1 N --- 54°C
∆T + 254°C
(14)∆T+ 20puls_1 N 5 puls_2 D -- --- -- 61°C
∆T + 2puls_2 N 2 50’128
G
Delicate 40°/45°
1’ --- 8 puls_1 N --- 45ºC
∆T+ 16--- --- puls_1 N 5 puls_2 D 5 puls_2 N 55°C
∆T + 1puls_2 N 2 12’85
E
Eco 50°
1’ --- 8 puls_1 N --- 55°C
∆T+ 12--- --- puls_2 N 5 puls_2 D -- --- -- 65°C
∆T + 1puls_3 N 2 12’71
D
Quick 40º/50°
--- --- --- --- --- 1’40º/
50ºC∆T + 2--- --- puls_2 N 5 puls_2 N -- --- -- 55°C
∆T + 1puls_2 N 2 ---41
P
Quick 50° - Italy
--- --- --- --- --- 1’ 55ºC
∆T + 2--- --- ctrl N 5 ctrl N -- --- -- 55°C
∆T + 2ctrl N 2 ---49
M
ELR (Daily)
--- --- --- --- --- 1’ 65ºC
∆T + 2--- --- ctrl N --- --- --- -- --- -- 65°C---
ctrl N 2 ---36
F
Soak
1’ --- 6 puls_1 N --- --- --- --- --- --- -- --- --- --- -- --- -- ------
--- -- --- ---9
Service programme
1’ --- --- --- N --- 50°C --- --- --- puls_2 N --- --- --- -- --- -- ------
--- -- 2 4’20
LEGEND
 ctrl =  motor speed 2800 rpmResin wash Levelº dH
Germanº TH
FrenchAutonomy Regeneration puls_1 =  3÷ 4 1600rpm + 0,9 2800rpm
 Drain 10 secWH 1
0 ÷ 4 0 ÷ 8 Total No puls_2 =  3÷ 4 1600rpm + 0,6 2800rpm Option [ ½ ]
 (half load)-No pre-wash
-W ashing time reduction 18 ÷ 28min
-W ater consumption reduction ~ 5l
 Drain & Fill 15 secWH 2
5 ÷ 18 9 ÷ 30 5 cycles al 6º cycle
 Washing:
 puls_3 =  3÷ 4 1600rpm + 0,3 2800rpm
 Drain 10 sec
WH 3
19 ÷ 29
31 ÷ 50
3 cycles
al 4º cycle
 N =  Normal (60On)
 Drain & Fill 15 secWH 4
30 ÷ 40 51 ÷ 70 2 cycles al 3º cycle
 Tipo di
 Scarico:
 D =  Dilution (11On)
 Drain 10 secWH 5
41 ÷ 50 71 ÷ 90 0 cycles ogni cycle
Edw_45it.doc 
						

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9. SERVICING
9.1 COMPONENT DIAGNOSTICS
This test is used by service engineers only to check the efficiency of the main electrical components.
To access the test procedure, it is necessary to press a combination of keys. Correct operation of the
components to be tested can be checked rapidly.
The component diagnostics procedure consists of 7 sequential phases:.

The component selected is displayed by a code shown by LEDs [LD9], [LD10], [LD11]

Press [S2] repeatedly to select all the components (in the sequence described below).

Each component is activated for a predetermined period (Time-out), after which it is disactivated
automatically.

When the period of activation has elapsed, the appliance goes into Pause mode until the
subsequent component is selected by pressing [S2].

The period of activation can be reduced (i.e. passing to the subsequent component) by pressing
[S2] before the end of the predetermined test period (Time-out).
9.1.1ACCESSING THE DIAGNOSTICS PROCEDURE
Door closed – Dishwasher switched OFF
1.Press and hold down keys [S2] & [S3
]
simultaneously
2.Press [S0] to switch the dishwasher on.

LEDs [LD1], [LD2], [LD3] flash to
indicate that the function has been
selected.
3.Press [S2] to start the function.

LED [LD9] lights immediately and the water fill solenoid is switched on.

LEDs[LD9], [LD10], [LD11] light in sequence to indicate the following functions:
LEDs
Lit (fixed)COMPONENTS TESTEDTIME-OUT

ADVANCE
KEY
[LD9]Water fill solenoid 20 sec
[S2] 
[LD10]Integrated dispenser (detergent/rinse-aid) 60 sec
[S2] 
[LD9]+[LD10]Washing motor 60 sec
[S2] 
[LD11]Heating element 20 sec
[S2] 
[LD9]+[LD11]Pause / Fan motor (if present) 60 sec
[S2] 
[LD10]+[LD11]Regeneration solenoid 60 sec
[S2] 
[LD9]+[LD10]+[LD11]Drain motor 60 sec
[S2] 
OFF END OF TEST PAUSE
EXIT
[S0] 
At the end of the test, LEDs [LD1], [LD2], [LD3] switch off; the appliance remains in PAUSE.

To exit the test procedure, open the door or switch the appliance off by pressing [S0].