Service manual
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6.3 Power feed and selection of programmes
The main board is powered directly by the terminal board. The connectors involved are E3 (neutral)
and E1 (line).
The control/display board (user interface) is powered by 5V supplied by the main board, so
programmes can be selected when the main board is turned on.
When the door is closed, the input board detects the closed contacts on switch (IP) between
connectors F1-F3 and starts the wash programme. The same switch supplies power to the electrical
components.
When the door is opened, power is shut off to the various loads and the cycle is paused.
7 Water filling
7.1 Fill circuit
7.1.1 Pressure switches on fill level and anti-overflow system
• The level of water during filling is controlled by level
pressure switch
(A)
• The anti-overflow
pressure switch (B) makes sure that the level of
water during filling does not exceed the safety threshold (overflow
through the door).
7.1.2 Fill system
The fill solenoid is powered by triac on the circuit board (connector A1) through the door switch (IP)
and the anti-flooding microswitch (DA).
The water level in the sump is controlled by pressure switch (RL). The circuit board constantly
monitors the status of the pressure switch through the “sensing” line connected to connector E1:
“EMPTY” if contacts 1-2 are closed
“FULL” if contacts 1-3 are closed
7.1.3 Anti-flooding device
When the anti-flooding device is tripped, contacts (DA) on the relative microswitch open and cut off
power to the water fill solenoid.
7.1.4 Anti-overflow system
If the pressure switch (PA) on the anti-overflow system is activated, the closed “FULL” contact (1-3)
starts the drain pump (PS), which operates until the contact switches to “EMPTY” (1-2).
If the door is opened or the machine is shut off, the drain pump shuts off.
7.2 Control of water filling
The quantity of water required to perform the washing cycle is exclusively determined by the closure
of the electrical contacts in the pressure switch when it switches from EMPTY to FULL.
B
A