Question about Bosch 24 in. SGS43C12 Classixx Free-Standing Dishwasher

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Bosch diswasher not draining. Cleaned Float, Outlet pipe clear.

It does run a cycle. There is a low humming noise at the start of the cycle. If this means something is stuck in the pump impellor, can I fix it myself or do I need to get a local plumber?

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You can fix it yourself, but it may involve partial disassembly of the unit.
I have written a guide that will help you. I am working on photos to accompany it, but I think I have made things pretty clear.
It is here. Be sure to tell me what you think!

Posted on Jul 23, 2009

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6ya6ya
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Posted on Jan 02, 2017

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Drain pump running as in flood protect mode even with door open, At first I thought the float was sticking due to sludge deposit.


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Goes through washing cycle then will not pump out, just makes like a low humming noise,when you drain it out with pipe at front of machine starts to run again ,checked filter in front of machine, outlet...


Hi from retired Englishman in SW France,
Have you managed to check that the drain pump is functioning correctly? Here is the final bit of my guidance notes on checking filters AND motors ;-0)
Disconnect power
Now- whilst the filter is removed it is normally possible to see the drain motor and ensure it is not jammed by a foreign object such as a needle or a toothpick. It should be able to be turned by hand/finger- the power IS OFF!
At this point it is also possible to test if the motor works. No clothes or water in the machine, select a spin cycle and put the power back on. You should be able to see the motor turning at some point, possibly straight away. If it doesn't work then the motor is malfunctioning!

Good luck!
John C

Mar 20, 2011 | Washing Machines

1 Answer

We have a bosch classixx free standing dishwasher and the base is filled with water, we ve removed the filter but there doesn t seem to be anything there causing the blockage.any ideas?


Hello Becky,

The most likely causes are a failed drain pump motor (or capacitor) or a jammed/broken pump impeller. There is a very simply simple test on classixx models which which help you to determine the cause, or where to look next.

1. Turn the wash cycle selector to any wash cycle so the "ON" light is illuminated, but do not press the START/STOP button.
2. Open the door and pull the lower basket out.
3. Locate the 'float', lift it up fully and keep it held up.

(The float is a dome/mushroom shaped protrusion in the base of the washer just to the left of the drain and partially hidden by the spray arm)

When you lift the float, the drain pump should run instantly and the water should drain from the washer. If you can hear a low hum from the pump motor in the base of the washer, but the water doesn't drain, then it's likely that the pump impeller is jammed or it may have broken away from the spindle. If this is the case, try repeatedly lifting and dropping the float fairly rapidly. Repeated stop/start signals to the pump motor can sometimes free a stuck impeller.

If you cannot hear any noise from the base of the washer when you lift the float, then the drain pump motor or the motor capacitor may have failed. A failed capacitor is often accompanied by a buzzing noise. Further testing will be required to determine the exact cause of the fault.

Please try the simple test above and then post back with the results for further assistance.

Hope this helps.

Regards,
BElectric

Mar 05, 2011 | Bosch 24 in. SGS43C12 Classixx...

1 Answer

My bosch diswasher is 2 months old and now the water doesn't drain. how can i fix it


Set the controls to off then power off at the mains for 30 mins and then power mains back on and run a drain program or a full wash program. If the water won’t drain away then the most likely problems are the door interlock switch is faulty, the drain water motor is faulty, there is a blockage in the drain outlet pipe or filter – this will need unblocking, there is a blockage in the water pump – this will need to be unblocked, the controller board is faulty – but this generally shows an error code. First turn off the mains power to the dishwasher then check the internal filter and screen and clean it thoroughly. Then check the waste water hose and any outlet valve and make sure that it is unblocked and free of any obstruction or waste material. If you have access to the water pump you can check that it is free of obstruction and is able to turn and that none of the impeller vanes have been damaged. Then if all this is OK then try turning on the mains power and running a hot wash cleaning cycle to flush out any remaining sludge / debris.

If the outlet pipe is clear and the pump motor is turning and there is no pump damage then there has to be a blockage somewhere. You could lay the out pipe flat on the ground with the end draining into a tray to see if any water actually does come out. If it does then you do not have a total blockage. This is because it will be most likely draining out of the machine due to gravity and shows that there may be a partial blockage of the pump is defective even though the motor may be running. You will need to remove the pipes to and from the pump to check for blockages and also remove the pump to inspect for damage to the impeller or a blockage in the pump housing where the hoses connect. If the pump housing is clear and the impeller can be turned freely with your fingers then the direct coupled or belt driven linkage between the motor and the pump is the most likely broken and will need repair or replacement. If the impeller cannot be turned easily and does not turn with the motor running then the impeller or the direct linkage is either seized or broken and will need replacing. If your pump and impeller is belt driven then check that the belt is not slipping – this will normally result in increased noise and a possible smell of burning rubber.

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