54 GV 640 Service Manual
For internal use only
6.7.4 Functioning of the circulation pump
Water is drawn in through the intake socket. The guide wheel leads the water smoothly through the
heating tube. The water is pumped across the pressure joint to the water diverter.
The brushless DC motor (BLDC) signals different water circulation states to the power electronics unit
via the power consumption of the individual windings.
• No water
• Too little water
• Sufficient water
• Pump blockage
Safety-relevant conditions, such as “heating without water” or “water temperature too high”, are recog-
nised and analysed for heating operation.
A pump blockage will be recognised by the electronics unit. The pump will attempt to solve the block-
age with brief stuttering pump activities.
If this does not help the current programme will be discontinued. A corresponding error code is stored
in the error memory.
6.7.5 Structure of the heater
The heater tracks are installed on a metal pipe with
a special coating. The connections and two NTCs
are integrated in the heater tracks.
The heating tube itself cannot be replaced.
1NTCs
2 Heater tracks
6.7.6 Functioning of the heater / NTCs
The water temperature is measured with the NTCs.
In the heating mode the electronics unit recognises which temperature increase is taking place.
The heater is to heat the water by 2.5 °C/min. If the dishwasher is connected to a warm water connection
or a solar system, the heater will be switched off at a water intake temperature of > 75 °C.
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