Question about Neff 24 in. S5443X2 Built-in Dishwasher

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Neff dishwasher has power but no light on. Won't work. Loud bang heard during cycle then stopped. Had panels off and pump works when float switch is lifted. Could this be capacitor at lower back where power lead comes in ?

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Neff dishwasher sticks on 1 minute

We had this problem with our machine.
There turned out to be a few things that caused it:

- Firstly, the float assembly (an orange looking float in a little chamber, visible if you take off the left-hand panel of the machine) was clogged - we cleaned this and it seemed to help.
- The heat exchanger matrix was full of debris - we tried to clean this but ended up damaging it and bought a new one.

.. these two things seemed to improve the cleaning and the machine worked for a while.

The real problem though (which caused it to pump out continuously) turned out to be a failed seal on the circulation pump.

If you look on page 4 of the following link:

https://www.neff-eshop.com/eshop/neff/gb/prodp.htm?eShopType=S&prod=S5456X3GB%2f22

.. you will see a diagram of the bottom of the machine - the part that failed was 171598, which you can see on the bottom middle-to-right hand side of the picture..
The rubber had perished very badly, and it was causing water to leak into the bottom of the machine, which triggers 'flood mode' whereby it pumps continuously and doesn't actually wash the dishes.

The part costs about £5 - fitting it is not straightforward though, as you need to strip the machine down which is a pretty involved job.
If you think you're up to it, the steps I followed were:

- Remove both side panels
- On the left hand side, remove heat exchanger matrix and float assembly
- Remove kick-panel under the front door
- On the right hand side, remove all wiring from the door to the machine (including an earthing wire which is screwed to the side of the machine) - note that there are two wires which go to push-on connectors which have to be removed separately - all the others go to connector blocks.
- Inside the machine, remove the wire baskets, spray arm and bottom filter.
- Remove the lid from the salt dispenser - and now the tricky part, you need to find something that will allow you to remove the large plastic 'nut' that holds the salt dispenser to the machine.
- Remove the two screws in the bottom of the machine (167241 in the diagram mentioned above)
- Now, shut the door and then disconnect the door spring mechanism from the left and right side of the door.
- Disconnect the string from the door closing mechanism from the springs at the left and right back corners, under the machine.
- Remove the two screws at the back of the machine which connect the top of the machine to the base.
- Remove the two screws at the front of the machine which connect the top of the machine to the base (these are quite low down, near the door hinges).

Now, you should be able to lift the top of the machine off the base, and will have access to the pump etc.


... re-assembly is the reverse of disassembly ;-)

This took me a couple of hours - it might be better to find somebody who will do it for you for fixed cost as it's a pig of a job.


For what it's worth, there seemed to be very few places where the machine could leak - and this looked to be the major one - and there are a few push-fit pipes which are worth checking out too.


Hope this helps somebody.





Posted on Jan 07, 2009

  • 909 Answers

SOURCE: Neff S4409N dishwasher makes a banging/knocking noise

if it knocks and bangs only when taking in water it may be an air lock in your pipes.

Posted on Oct 05, 2009

SOURCE: my neff S5443X2 dishwasher pump keeps running - in

When this happens usually it is a sensor.and/or the main unit Brain. One needs to troubleshoot to tell, as many, most? symptoms seem similar but have differing sources. One needs to troubleshoot.
To have any chance at DIY repair you must obtain a service manual.
below is a DIY website to assist you in isolating your issue. If you cannot find a service manual (I looked but was unable to find one) then the best way would be to contact Neff direct, http://www.neff.co.uk/ and ask for one.Simply contact them and ask.
DIY website below.
http://www.acmehowto.com/howto/appliance/dishwasher/dishwasher.php

Posted on Sep 22, 2010

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1 Answer

Dishwasher drain pump continues to run constantly and does not progress onto a wash cycle. I've unplugged, pulled the unit out and removed the LH panel. Taken off the side tank and the lower mounted...


You have provided a very detailed explanation of the problem. You will have to check if the spring in the float is ok. May need to replace it. Cheick this.

Jun 24, 2011 | Neff 24 in. S5457X0GB Built-in Dishwasher

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Hi My dishwasher seems to get stuck in a cycle when you start it - it lets water in for around 20 secs - then pumps it out - then lets water in for say 20 secs then pumps it out - over and over and...


Hello Gerard,

This is an overfill 'fault' generally caused by one of the following:

1. Faulty or incorrectly installed flow-meter
2. An airlock in the fill chamber
3. Faulty float switch (less likely)

There are some simple checks you can do to determine the cause of the fault and hopefully solve the problem without replacing any parts - no tools required at this point.

First, open the door, pull out the lower basket and locate the float. This is the 'mushroom' in the base of the washing compartment:

belectric_200.jpg
With the washer empty of water, make sure the float is fully lowered. There should be a gap of 2-3mm between the float and the base of the washer and you should be able to lift it about half an inch / 12-15mm. When you lift it, it should fall when you let go. If it's raised when the washer is empty, it should not rise again on its own when pushed down.

If the float seems to be working correctly, the controller is receiving erroneous signals from the flow-meter that the washer is full or overfilled. This causes the washer to pump out - then resume the fill cycle because the water level is too low to start the wash. If this is caused by an air-lock, there is a simple trick to clear the air-lock and, therefore, the fault.

1. Start a wash cycle and keep you finger ready on the power switch on the control panel.
2. As soon as you hear the pump start during the fill cycle, interrupt the cycle by pressing the power switch to the off position
3. Wait for about 10 seconds, then switch the power on again.

The machine should resume filling rather than pumping out. Keep your finger ready on the power switch and repeat steps 2 and 3 until the washer is filled and the washing cycle starts. If you can get the washer to run a cycle using this trick, you may not need to do anything else, but you may need to repeat the procedure described above at the start of the next few cycles.

If the washer does not resume filling and continues pumping when you switch the power on again or you have to repeat the procedure above at the start of every wash cycle before it will run, you will need to check the flow-meter and, most likely, replace it.

I'm happy to provide step-by-step assistance with checking and replacing the flow-meter if required, but please check the float and try the simple trick above first, then let me know if you need further assistance.

Hope this helps.

Regards,
BElectric

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1 Answer

I have a Neff Dishwasher S5443X2 and the dishwasher tablets are not dissolving. The tablet door is open when the machine finishes but most of the tablet remains. We tried using detergent but still the same...


Either:
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  2. the pump is clogged - there is water, the motor will run but no water is circulated. Check pump filters, check chopper and impeller.
  3. motor in main pump is not working - could be caused by something stuck on the impeller or chopper or could be a problem with the motor itself or control board. Check if line voltage is coming to the motor during wash/rinse cycle.
Good luck,
Vlad
First Choice Appliance

Jun 27, 2010 | Neff 24 in. S5443X2 Built-in Dishwasher

1 Answer

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its quite common for the interferance filter to fail on these models its situated in the base of the dishwasher connected to the mains block usually when they fail you can see black dust around it,

Nov 15, 2008 | Neff 24 in. S5456 Built-in Dishwasher

1 Answer

Pum continue running and never end cycle


Ok,

So you know how to get to the float mechanism. I also noticed that when i lifted the red anti flood pole the pump keeps going & also the float will not move because if you add water to the small chambe it runs away as it should do. The next thing i tried was to unplug the electronic float switch. I use alot of these devices in my line of work & sometimes they stick. By unpluging it & seemed to do the trick once reinserted the pump has stopped. To double check just lift the red pole & the pump will start again as if it has registered a flood alert. Problem solved & £300 better off. Note if it still runs after this, the switch could be at fault they cost pennies to replace. Good luck

Nov 04, 2008 | Neff 24 in. S5456 Built-in Dishwasher

1 Answer

Pump not stopping


If you have to bang the float to stop the the float switch is not working correctly.. you may have somthing holdig it up or the switch itshelf is failed...

Sep 24, 2008 | Bosch 24 in. SGS43C12 Classixx...

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It is possible drain pump blocked, you need to empty d/washer manually, check inside drain pump which is at end of drain hose, always isolate d/washer from power before attempting any work on it.

Aug 14, 2008 | Neff 24 in. S5456 Built-in Dishwasher

1 Answer

Dishwasher stuck on "drain"


not easy to fix - it has a leak. the tray at the base is full of water which ooperates a float which switches drain pump on. remove front panel at bottom front and mop out water or tilt backwards 45deg and water will run out. leak is usually main pump

Mar 18, 2007 | Neff 24 in. S5543X2 Built-in Dishwasher

1 Answer

Dishwasher does not stop filling and already replaced float switch...PLEASE HELP


Harry, the float and float switch are only safety devices to cut the power to the valve in the event the control board fails. The fill is controlled by the board. It sounds to me like it may be the valve itself. You can verify this by taking a meter and checking the voltage during the fill cycle. If the voltage drops out and it's still filling, it's your valve. If the voltage stays constant until the float switch kills it, it's your board...Catriver...post back.

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