58 GV 640 Service Manual
For internal use only
6.8 Discharge pump
Water is drawn in through the water discharge
opening in the pump cavity. The impeller wheel
pumps the water through the non-return valve into
the discharge hose.
1Catch
2 Seal
3 Impeller wheel
4 Cable holder
The brushless DC motor (BLDC) signals different states to the power electronics unit for discharge
pumping via the power consumption of the individual windings.
• No water, idle state
• Too little water
Water will no longer be pumped off if there is too little water in the pumping section.
• No build-up of pressure
If the cover of the pump cavity is not present it will not be possible to build up water pressure. An
error code will be stored in the electronics unit.
• Pump blockage
A pump blockage will be recognised by the electronics unit. The pump will attempt to solve the
blockage with brief stuttering pump activities.
• Blocked or bent discharge
Water will no longer be pumped off if the discharge is blocked or if the discharge hose is kinked. An
error code will be stored in the electronics unit.
6.8.1 Checking the discharge
pump
Identification is made by means of the pow-
er consumption of the pump in the idling
mode and the various charge states.
1. Measure the winding resistance of the
BLDC motor
2. Measure the winding resistance on the
winding contacts of the discharge
pump.
Resistance: approx 82
Ω ± 8 Ω
Resistance readings are approximate readings. Results must be symmetrical.
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