GV 640 Service Manual 71
For internal use only
7.6 Salt refill identification
The circuit board for salt refill identification is fas-
tened to the right-hand side of the softening equip-
ment (front of the diswasher) with catches.
1 Water softening equipment
2 Circuit board with a light barrier
A light barrier identifies the level of salt. If the regenerating salt level becomes too low, the light barrier
sequence is released and the electronics unit identifies “refill with salt”.
When the salt refill display lights up there is still enough salt in the dishwasher for a few regeneration
cycles.
With this principle it is not necessary to fill the salt
box with water when the diswasher is put into
operation.
The system does not recognise salt tabs that are
filled in.
1 Photo diode
2 Regenerating salt
3 Transmitting LED
7.7 Visual clear rinse fill-up sensor
The visual rinse aid fill-up sensor comprises a transmission and a receiving diode.
The transmission diode sends a light beam to the
receiving diode via a prism. If the reservoir is filled
up, the light beam will be dispersed in the prism.
The signal received is weaker than the signal
transmitted.
1 Receiving diode
2Prism
3 Transmitting diode
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