GV 640 Service Manual 65
For internal use only
7.3 Float system
A movable styrofoam disc has been let down into
the base pan. Styrofoam is lighter than water, so
that it floats. The styrofoam disc is mechanically
connected to the safety switch. If water gets into
the base pan the styrofaom disc floats to the top
and activates the safety switch.
1 Safety switch
2 Styrofoam float
7.3.1 Functioning
The safety switch is a selector switch. The power
module activates the switching contact with a mains
power supply lead.
This signal is reported back to the electronics unit
when the dishwasher is in the idle mode.
Idle mode signal path
When the safety switch is activated, the mains
power supply signal reaches a differerent electron-
ics unit contact.
This bypasses the main switch.
The electronics unit recognises that the dishwasher
has been switched on with the safety switch and im-
mediately begins to pump off water.
Active safety system signal path
Main switch
Relay ON
Water
Safety switch
Main switch
Relay ON
Water
Safety switch
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