Question about Miele 24 in. G646SC Plus Free-Standing Dishwasher

1 Answer

Drain pump runs continuously

This started with wash programmes at end of wash cycle but a pre-wash would work fine. Pump would run for extended period then inlet/outlet light would come on.
I cleaned all filters, checked supply/drain hoses, checked the leak switch at in bottom tray and another pressure operated switch located back rh corner connected to filter sump(?) by black hose. All seemed servicable. But no real improvement in fault.
Any other switches etc I can check before reorting to the (very expensive) circuit board. Does anyone have a service manual and/or illustrated parts catalogue? or know where/how to obtain one?
Thanks in advance

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  • 3 more comments 
  • lotus2008 Feb 24, 2008

    I have the same problem. Mines a G640

  • lotus2008 Feb 24, 2008

    I have the same problem. Mine's a G640.



    I don't know where pressure switches are but mine pumps out fine but just won't stop trying to drain.

  • Bruce Wilmot Feb 24, 2008

    Hi gwshaw71




    The exact model is Type HG01 Model G646SCi Nr 22/45885686.


    Any assistance greatly appreciated.

  • Bruce Wilmot Feb 24, 2008

    Sorry missed the bit about fault codes... how do I read them?

  • jesper mlb Aug 13, 2008

    I have the same problem on a Miele G647 SC Plus. Did you manage to solve this and if so what was the problem causing it to stall before the drying cycle? Thanks in advance.

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Which model do you have and is there any fault codes showing on unit? I have all of the service manuels for miele products.I am factory auth. for service on miele.

Posted on Feb 24, 2008

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Zanussi zdt 6053 usually will not run full cycle (on any cycle) but stops with constant error beeps. But it is draining ok and sometimes goes full cycle (not often) Any ideas?


Could be anything!
If you suspect that there is a fault then it will be displayed by blinking LED "END OF CYCLE". As the display of failure in hexadecimal code it can flash up to max. 15 times than short pause and after that repeat fault code. You must to count the number of times the LED "END OF CYCLE" flash up.

Example from user manual: Anti-flood device is activated.
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To cancel a washing programme in progress:
- Open the dishwasher's door.
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I have a SGV43A03GB Bosch dishwasher that has run perfectly for several years and now stopped. Essentially all the lights remain on, there is water in the pan (indeed it fills after having been emptied...


It is a common fault that the drain fails to work in most machines in a period of time and is the most problematic fault in a washing machine. In all occasions it is important that your observation is most important and so is vital to the identification /rectification and solution. If there is intermittent power to the drain valve/pump then the program controller unit is a suspect. Also if the Inlet valve is staying OPEN and the drain pump is working as soon as the machine is switched on then it can be fault in the controller unit.

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The washer floods at the end of the cycle the pump is working this i know because when i manualy lift the mushroom float it pumps out could it be that there is a membrane in the mushroom float that is...


Hi there,

I'm not entirely sure what you mean by "floods at the end of the cycle". Is water leaking from the washer and where from?

The mushroom float isn't a water level sensor to determine when the washer should pump out. It's a second level safety feature to prevent flooding if the washer overfills. The flow meter regulates the water level in the washer.

Your pump is obviously working and there is no blockage in the drain hose, etc as the water pumps out when you lift the mushroom float. It sounds like the pump isn't receiving a signal from the controller to pump out at the end of the wash cycle. Lifting the float bypasses the controller and runs the drain pump.

Please try the following simple test:

1. Switch the programme selector to "Off"
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Water does not drain out


Hi and welcome to FixYa, I am Kelly.

There is always just a minimal amount of water in the bottom of a dishwasher so that the pump seal does not dry out causing water to run through the pump motor. Usually though it is not visible yet is is possible.

Excess water in the bottom of the tub post cycle are a sign of draining problems however this is a list of what it could be.

1. A partially clogged drain
2. The timer motor is not functioning properly
3. A broken or worn pump impeller
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Here is what you need to do:

Check your entire drain system. Start at the final outlet and work your way backward to the motor pump connection on the dishwasher.

Suspected areas are.

a. The sink connection outlet is clogged (this can be inside a garbage disposal.

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c. There is debris on top of the the motor pump housing blocking the inlet drain. (This would be inside the housing of the lower wash arm on the very bottom)

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A partially blocked inlet tub drain to the motor pump would also explain why the lower part of the dishes are not getting clean. Additionally you would have spotted dishes post cycle.

When the drain is partially blocked some models use the float level switch in the tub to control the advancement of the timer. If the water does not drain the motor pump continues to run and run and the cycle does not advance until the tub is drained and the float switch senses same. i.e extended cycle
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