[renMike]

Re: Neff oven timer problem

Ok,
Now that the Christmas holiday season is over and the pressure is not as great on the oven I have found some time to take the oven out, lift the lid and peek inside. I can see the timer unit with a model number of 13805-006 B. This is a black plastic box with a PCB clipped on the back, which when removed exposes a smaller PCB inside the box. The larger external PCB has what looks like two white rectangular relays on it on one side and a transformer on the other. There are also six spade connectors across the top, a ribbon connector to one side, a capacitor and a black rectangular box under the white relays.
Some questions:-
* Are all these components together considered as the ‘timer’ or are only some of them the ‘timer’?
* Assuming the entire lot is referred to as the ‘timer’ then are the white rectangular components relays, or is it the black one?
* If these are not the relays I should be looking for then where are they?
* No burning or other damage is visible on either side of the larger external PCB or to any component on it following a brief visual examination. Should I be able to see any damage if the relay has gone?
* Is it possible to buy these components as spares, if so then any idea from where as a general internet search doesn’t throw up many (English) results?

Thanks,

Mike

[renMike]

Re: Zanussi ZWF16581W – Sealed drum?

Thanks for the recommendation. Still considering options as the current machine violently destroys itself.

[renMike]

Re: Zanussi ZWF16581W – Sealed drum?

Finally checked, it’s sealed.
It’s also leaking now as well.
And the severity of play in the bearings seems to be affecting the cycle as the spin cycle stops rather than complete.
Time for a new machine I think. Are the ISE ones any good?

[renMike]

Re: Zanussi ZWF16581W – Sealed drum?

Thanks for your replies. Sounds like the best bet is to pop the lid and take a look.

[renMike]

Re: Neff oven timer problem

I’m sensing that this isn’t going to be a simple task then?

[renMike]

Re: Neff oven timer problem

Dave,

I can confirm that turning the oven off for 5 minutes (well 25 actually) and then testing the timer when it’s turned back on again shows the same symptoms. The clock needs setting but then the oven works fine in manual mode, but not on timer mode.

Presumably I turn off the power, pull the oven out of the unit, open the top in order to get to the relay. I also presume that the relay is in the timer control box behind the buttons, but where should I be looking? Does anyone have a photo indicating the position of the relay, or will it be obvious once the lids off? Is there a test (I have a multi-meter) I can perform to confirm the diagnosis?

Thanks,

Mike

[renMike]

Re: Neff oven timer problem

Dave,

Thanks for the reply.

If I’m not using the timer then the oven works as well as it ever did. It seems that only the timers control over the oven is no longer working. Could this be a symptom of a fused relay as you suggest or would that stop the oven from working in other ways?
Mike

[renMike]

Re: Neff S5456X2GB/42 keeps draining

It probably does help. I’ve already checked the sump and it is dry. I’ve manually tried actuating the anti-flood device (red rod) and it makes no difference once the unit is in its fault state. To complete the tests I also tilted the machine forwards (and backwards) but little to no water came out. I think that the only water that did come out was the residual from the drain.
So yes, your diagnosis does kind of help as it points the the main PCB.

Is there any conclusive test I can conduct to prove this?

[renMike]

Re: Neff S5456X2GB/42 keeps draining

Martin,

Thanks for going back over the trail. I too think I am missing something obvious here, but unlike you I don’t have a wealth of experience to draw upon.

To answer your questions:
The “sucking air” sound was first noticeable with the door closed and the machine apparently mid programme. I was initially curious why the same noise was comming from the machine for what seemed too long a period and so opened the door. The sound continued even when the door was open. Since the machine doesn’t actually suck the water out (I may be wrong here) I’m presumming that the sucking sound was actually the impeller spinning in a shallow pool of water(?).

The programme being cancelled was manually by me via the Auto + 35 degree key combo.
To speciffically answer your latter question, it did not stop with the door open untill I manually cencelled it.

Since the last post I have further investigated what I now know to be an “Air Pressure Switch”. This is a round device under the inlet reservoir with a protruding peg that pushes against a horizontal blue bar. This device apparently controls how much water is in the machine(?). I knew that the switch it [blue bar] operated was operational since I ran a continuity test on it a week or so ago, but at that time I disassembled, cleaned and reassembled the whole pressure chamber assembly and may have either missed some gunk or damaged the sensor in the process. So may aim tonight was to get the machine into the fail state (e.g. “sucking air” state) and try to manually accutate the switch. The result of this test is that this does not appear to be the problem as although I could hear the switch clicking it made no difference to the machine.

One point of potential interest is that I initially could not get the fail state tonight since I had selected the Quick Rinse programme and this finished normally. I then tried the 35 degree programme and this failed as described. I guess that the Quick Rinse programme is not doing something that the other programmes are doing. Any ideas what that something could be and does it help diagnose my problem?

I really appreciate your perserverance in this matter as my other half is getting a bit upset at the prolonged absence of said machine and if I can get it fixed rather than having to buy a replacement I’d feel a lot better. If there are any tests or further descriptions I can provide to help then please let me know.

[renMike]

Re: Neff S5456X2GB/42 keeps draining

Doh!
I know the swtch is working as I can manually acctuate it and the er flow stops/starts.
I guess that means the control board has gone (without visible damage). Is there a way to test this via continuity or current measurement?

[renMike]

Re: Neff S5456X2GB/42 keeps draining

Is there a switch or sender to tell the machine when it has drained all the water or is it on a timer?

[renMike]

Re: Neff S5456X2GB/42 keeps draining

Ok, I’ve just sent it through a normal ‘eco’ programme which should take 85 minutes (according to the display). At about 50 mins through the programme I believe that it started to drain and didn’t stop. With 30 minutes left on the clock I opened the door and heard the drain ‘sucking air’. The inside of the machine was very warm but not steamy. The programme was cancelled at this point.

Reading testing documentation for other Bosch machines I note that there is a test mode you can put it in which runs short cycles of each stage to test them. Is this an open for my model? If there is and I can access it then I think that would prove if the machine was heating, filling, draining, etc.

Alternatively, would you mind posting instructions or pointing me at a link containg instructions so I can complete that test?

Thanks,

Mike

[renMike]

Re: Neff S5456X2GB/42 keeps draining

Is the a way to test for sure? If seen other models have insructions for either the control board or heater itself to test continuity, but I can’t find any for my model.
Also, If the heater isn’t working would that normally keep the pump running?

[renMike]

Re: Neff S5456X2GB/42 keeps draining

I think so. I’m not getting the full steam effect I used to get when it was working correctly, but then I don’t know if its got that far in the cysle.
Is there a definitive way to test?

[Author]

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