Neff S4130W0GB/21 or S5R28F dishwasher not heating well

[echase]

I have acquired a 23-year-old Neff S4130W0GW/21 dishwasher in my new home. Not been used for at least a year and was reported as dead. Initially when I tried it it would only heat when drying but not with water in it. Otherwise all the right pumps and valves seemed to operate OK. Then it started heating on the main wash cycle. Unsure at the moment if it is working on all cycles.

The only thing I did that may have kicked it into life was to temporarily short the “3^rd thermostat” as it was registering open circuit whereas the others were closed. But it heated “OK” even when the short was removed.

This 3^rd one is mounted on a stud welded to the underside of the tank. So cannot be removed to change it it seems. What does it do? The wires to it are quite thin so unlikely to be carrying the element current like the other 2 thermostats.

This is a machine with a “clockwork” programmer and exposed element in the tank. No electronics of any sort to be seen so the 3^rd one is not a thermistor.

[electrofix]

parts list is here
https://www.neff-home.com/uk/supportdetail/product/S4130W0GB/21#/Tabs=section-spareparts/

some of the stats are locked in by a ben tab on the heater. if this stat is atatched to a stud it should screw in but i can see it quickly on the parts list

check the wires at the bottom of the door as they stick in the tar and snap
be careful taking the door front off as it hooks in the plastic at the top and the age of the plastic will make it brittle

Dave

[echase]

You are not wrong about the plastic! I snapped one catch before I got to posting here.

Diagram very useful thanks. My 3^rd stat is item 10 on the second page, which is a 65C one here https://www.yourspares.co.uk/parts/bosch/dishwasher/cg200/parts/ys70382/bosch-cg200-dishwasher-temperature-regulator-BSH022480.aspx It is screwed in. Can’t find it in the price list on your link. The only stat listed in the price list is +0061 which I can’t find on the diagram or elsewhere using google.

Please can you explain how that list works as the numbers like +0061 on the left hand side don’t seem to link to any other number there. And the part numbers in the middle are very hard to match to the diagram as there is no search facility for them that I can find and they are not in number order. There is search box there but it never turns up anything. Also clicking on a part in the diagram does not jump to the part’s price like it does on some similar diagrams I have seen.

What I think might have happened is that the machine sitting idle caused the programmer’s main heater contact to jam up. By my using it again it freed itself up by the time it got to the drying cycle.

But that does to explain the thin wires on the 65C stat as there is no relay I can see that can translate the smaller current in this stat into heater current. Also it seems to be open circuit all the time.

If the Programmer is sticky how realistic is it to prise it apart and clean up the cams and switches? I fear a mighty ping as all the bits fly everywhere. And a new programmer at £120 is not worth it, considering the machines age.

Pretty impressive that, of the 4 Neff kitchen appliances that the builder put in 23 years ago, all but this dishwasher seem to work well. All the neighbours have them too and likely will report the same.

[electrofix]

with your item 10 you look to the right and there is a list of part numbers. in your case its 00022480

https://www.neff-home.com/uk/shop-productlist/00022480

neff have no stock
is this stat open or closed circuit at the moment ?

if its the stat that controls temp it may be open circuit and closes when it gets hot. On a lot of loder machine this is used to turn on the timer motor so the timer can turn off the heater. You will probably find thin wires going to it to confirm this as they use thicker wires for higher currents

Dave

[echase]

If it has failed I guess it’s not that difficult to take a generic thermostat such as https://uk.rs-online.com/web/p/thermostatic-switches/0339308/ or even https://uk.rs-online.com/web/p/thermostatic-switches/7334723/ (need to find one of the right temperature and NO or NC contacts) and sticking it with heat conducive epoxy to the old mounting or to the flat surface under the tank. Don’t suppose professional repairers are allowed to do this as it is using non-official parts.

It’s so old that does not seem many parts are still in stock.

[electrofix]

check ebay as a lot of people strip old appliances and sell parts

Dave

[echase]

Meant to ask something else. In the base there is a heavy layer of white deposits that might be soap or corrosion. It’s clearly been leaking quite a bit of water into the drip tray, which presumably the emergency drain arrangement has been clearing or its just been evaporating. If this is due to a lack of sealing between the drain sump and the tank how easy is it to tighten up the seal holding them together? Or does it need a whole new seal? Not sure the machine is really worth saving if it needs a major dismantle to change this seal. Or is there another likely suspect for this leaking?

Seal 081708 and clamp 081709 seem to be the ones. Both out of stock. I did see a generic set advertised but was not sure they fitted this model and looked more like 2 gaskets or O rings that were clamped with self tapping screws.

[electrofix]

yes look like that part is obsolete

Dave

[echase]

Had another look at it and there are similar white deposits around the clamp, which looks like thin jubilee clip of huge diameter with a screw tightener. Will simply tightening up the clamp fix this?

[electrofix]

you wont know unless you try

Dave

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