Philips 3000 series, Service Manual, Page: 39 / 79

PHILIPS 4000 and 3000 04 OPERATING LOGIC
9/10
4.6. Water level detection (water tank)
“Water low” message (water reserve)
Function:
The water level is monitored by a capacitative sensor, located one
third of the way up the water tank wall.
If the electronics assembly detects, by means of the sensor,
that the amount of water in the tank has dropped below the
above mentioned level, a water reserve remains available for
the dispensing process underway (this will cover 200 flow meter
pulses).
The product dispensing process will then come to an end.
If a dispensing cycle ends after the sensor has been triggered (in
the reserve) then the display “Water low” continues to be displayed
during the following dispensing cycle.
200 puls.
Sensor
Water tank
“Descaling” – message with water filter
inserted
(appliances with display only)
The water hardness is set on the basis of the
regional water hardness analysis
(1, 2, 3, 4).
Filter off:
If the function is turned
off
the electronics
assembly monitors the flow meter pulses,
recording
one pulse each turn
.
Filter on:
If the function is turned
on
the electronics
assembly monitors the flow meter pulses,
recording
one pulse every two turns
.
“Change water filter” message
The electronics assembly uses the flow meter
impulses to keep track of the amount of water
which has flowed through; after the specified
amount (set in accordance with the water
hardness level), the “Replace filter” message
appears.
4.7. Descaling request
360°
1 rev
Number of pulses
Filter
on
Filter
off
Flow meter pulses