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...

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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)...

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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...

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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...

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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...

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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...

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8.ELECTRICAL FUNCTIONS
8.1 CIRCUIT DIAGRAM 

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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...

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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...