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Hi,
Any advice or thoughts regarding the following would be greatly appreciated.Model
The manual for my Neff dishwasher has “9000 022 535 (8406)” on the front.
The pamphlet says “9000 020 129 (8406)”.
I’m assuming that “8406” identifies the model. Apologies if this isn’t the case.
The dishwasher is a built-in model, is over 10 years old and came with the house.
I have had it for 5 years without any problems.
The details on the door are really difficult to read but I think the type is “SL15K1F”.Problem
Both the normal (65 deg. C) and Eco (50 deg C) cycles never complete.
Not tried the quick was or pre-rinse cycles.
The dishes are clean and as far as I can tell it never realises the wash is done.
The 65 cycle should take 106 minutes and the Eco 140.
I left the hot cycle alone and after about 6 hours aborted the cycle.
Once aborted the machine empties OK.
Prior to this I did think that it was taking a looong time to complete a cycle (we tend to use only the 65 wash) – it just sat there with the “Active” light on. Eventually it would wake up and decide to finish. Now it makes a noise and seems to be doing something, so this behaviour has changed.Symptoms
65 wash has hot water and it makes a noise. Not sure what it’s doing but I don’t think the rotor arms are in use. Sorry to be dim but I’ve never paid any attention to what sound corresponds to what it’s doing…
50 wash was aborted after about 150 minutes again it was making the same noise but this time the water was cold. Not tried the 65 wash since the Eco so can’t say if the heating element has now failed…
Both have cycles have not drained and both finish quite quickly when aborted.
I use salt and rinse aid, am in a medium water hardness area (TA7) and the dishwasher has no problem with leaks or other obvious faults. I must admit to never having done any maintenance on the thing as it always behaved very well.I have various theories about what the fault might be but if anyone could narrow the field for me that would be very helpful.
If you need more details please post here.
Thanks in advance for your time and trouble.
Re: NEFF 8406 Cycle never completes
From the numbers you gave I would think you refer to a S4443N7GB? Possible suffix /08? Which is a semi integrated machine with a grey plastic tub? Circa 2004 (June).
If so and reading through all your symptoms then the timer control is suspect at this point. One thing I need you to clarify first…it does heat the water does it?
Re: NEFF 8406 Cycle never completes
Hi Martin,
Thanks for taking the trouble. Just ran a hot (65 deg C) wash and decided if it didn’t stop after the correct time that I’d abort.
When I first checked it about 5 minutes before it should end the water was barely lukewarm (around body temperature) but the dishes etc. looked clean.
Luckily I left it running and yes, the water got very hot shortly thereafter – but I don’t know if it was my pausing the cycle that made it do this?So yes, it does heat the water and I suspect it probably goes through the wash cycle OK and gets confused right at the end of the wash … maybe.
If it helps, the details on the door are:
S4 443W8GB/16
FD 8501Again, thanks for your help, it’s really appreciated.
Re: NEFF 8406 Cycle never completes
Do you notice at any stage in the cycle the machine filling/draining/filling/draining in rapid succession?
Re: NEFF 8406 Cycle never completes
Hi Martin,
No, I don’t think it’s doing that – but I’ve never sat by it through a whole cycle. After the last wash the dishes, though clean, seemed a bit greasy or soapy so I’m guessing that by aborting the cycle it never got to properly rinse them. Or it might just be me being a bit too eager and should’ve left it a bit longer!
On reflection I think that maybe the rotors are active when it reaches the point where it should finish. Next time I’ll try and pay more attention – and run a rinse cycle at the end and see what that does (never used the rinse cycle!).
Also, when I do abort the cycle there doesn’t seem to be much by way of soap suds in the water – I’ll try and remember to see if the water is soapy or not next time. The detergent tablet gets released OK during the wash cycle.
When I do abort the pump doesn’t seem to have much draining to do, though there is water in the unit. It kicks in several times for a very brief time (a few seconds) then engages for a slightly longer time then the cycle ends.
There’s no water sloshing around when I open it up when the cycle’s finished.My overall impression is that it seems to be able to heat the water OK and do the bulk of the wash cycle OK. Also, the water did heat up after I checked last time and the manual says the hot wash ends with a hot rinse to dry the dishes.
My guess (and it is a guess!) is that it doesn’t get to complete the final rinse.As ever, thanks for your time, much appreciated.
Re: NEFF 8406 Cycle never completes
Hi again,
Update
My bad – having sat through a complete cycle I’ve changed my mind and would say that yes, it is repeatedly filling up, heating up the water, draining it and then starting over.Apologies!
Re: NEFF 8406 Cycle never completes
It is so much easier putting over questions I would ask on site in your home and far harder in forum speak. I refer to filling/draining/filling/draining every few seconds. Is that happening?
Re: NEFF 8406 Cycle never completes
Not exactly, I’d say the fill/drain cycle at the end when it seems to get stuck is of the order, I’d guesstimate, of a minute or two with some rotor movement in between.
The couple of cycles I were around for were thus:
– fill with cold water
– water heats up (gets very hot, unit is full of steam), rotors turn
– drain (quite quick but in a few shortish pump bursts, not one continuous run).I can at least still use the appliance, albeit I have to time when I abort so it’s full of hot water!
Hope this helps. I could take a video of the unit then you’d be able to hear the noise it makes? Not sure if this forum would let me upload it tho’.
Next time I use it I’ll pay close attention at the end and time things.
Thanks for your continuing help and patience!Re: NEFF 8406 Cycle never completes
Hmm? Tricky one to be honest. It might well be overheating and the overheat protection stopping the machine toward what would be the end of the main wash part of the program?
Does it work OK on the Pre-rinse and quick wash programmes?
Re: NEFF 8406 Cycle never completes
Sorry to be a pain but the damn thing’s behaviour has changed :bang:
This time it never drained – the water stayed soapy and the pump never engaged.
In the end I aborted the cycle and then, to rinse it out, started a quick wash (without detergent) for a few minutes then aborted that as well.Will try the quick wash tomorrow night (Monday) and let you know how I get on.
Thanks for sticking with this saga…
Re: NEFF 8406 Cycle never completes
Well at least it’s now consistent.
Just did a quick wash and it did the same: never drained and the cycle never stopped.In your very first post you said you suspected the timer control and I think we have a winner. A quick skim through the shop section shows that Neff Dishwasher Timers & Control Modules prices range, very broadly, from £50-£100. Assuming the timer for my unit is still available, is it a big job to fix/replace the timer unit?
Thanks as ever for your advice.
Re: NEFF 8406 Cycle never completes
Just did a hot wash then ran a pre-rinse to get rid of the soapy water … and the pre-rinse completed OK.
I’m probably clutching at straws here but I’ll do another hot wash sometime soon (probably Friday) and see if completing a cycle has cleared the fault…Re: NEFF 8406 Cycle never completes
DIYdisaster wrote:… and the pre-rinse completed OK.
Finally we have established that the pre-rinse cycle works normally.
That pretty well rules out the Control unit (which incidentally costs £81 and is part no: 00426436).
Next question: When it sticks and you feel the need to abort (reset) the cycle, does it pump out all the hot water OK?
Re: NEFF 8406 Cycle never completes
DIYdisaster wrote:Yep. The abort empties the unit just fine.
That fact now rules out the drain pump. So the finger of blame lies with the thermostat on the top of the heater unit. Accessing that to replace it is simple enough but warrants a deal of surgery involving lying the machine on its back and removing the bottom inspection cover.
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