[benwest]

Re: Neff S51M63X1GB constantly cutting out

it hasn’t been extended. Yes it connects under the sink. I have fully removed the drain pipe and washed it through, and I’ve also done the same thing to the shorter pipe that connects the sump to the matrix. No blockages or gunk anywhere. also taken off and reinstalled the drainage pump to see if there was a hidden obstruction – nada.

(since doing this the drainage pipe is of course dry and the fault still occurs, so i reckon that rules out a blockage issue in the drain)

as i say there’s a whirring (motor/pump) sound accompanied by some clicking which lasts 20/30 seconds whenever the machine regains power then after that it cuts out completely and may not become responsive again for a fair while. i admit that i don’t know which pump i am hearing mind you. the drainage pump definitely spins because i can see it (and feel it), i wonder if the behaviour of successfully pumping to the matrix but failing to drain back out is consistent with a problem in the circulation pump instead?

cheers, ben

[benwest]

Re: Neff S51M63X1GB constantly cutting out

thanks all. having done some more experimenting i’m pretty sure it’s not the door sensor.

i’ve figured out that the machine is consistently cutting out at the point it tries to drain itself (and fails). this happens 10 or so minutes into the first cycle after i have manually drained it. it spends those ten minutes taking in water, washing as normal, then pumping that water out into the matrix. then when it tries to drain this water to sewer it cuts out. any subsequent resets fail immediately because the matrix is full of water so the initial attempt to drain fails and the machine cuts out. it then needs manually draining to manage another 10 minutes.

the pump definitely runs (i can hear it, plus it manages to clear the main chamber to the matrix no problem). so the problem is somehow in dumping water from the matrix to the drain. the drain pipe is clear as far as i can tell. what else could i check?

[benwest]

Re: Neff S51M63X1GB constantly cutting out

hi again before i order a replacement door switch could anybody who knows more about this sort of thing suggest whether the intermittent behaviour is consistent with a switch which doesnt seem to read closed at all? it seems to be that the machine shouldnt work at all in these circumstances. thanks 🙂

[benwest]

Re: Neff S51M63X1GB constantly cutting out

ah yes of course that’s what you meant, been a long day…

it actually doesn’t change when presented with the magnet from the machine itself. so this suggests a fault in the sensor i assume. but in your opinion could this explain the behaviour of working intermittently and sometimes turning on and back off itself, occasionally getting part way through the cycle, responding temporarily to plug-pulling etc…? surely if the sensor doesn’t read closed at all it won’t allow the machine to operate at all… or have i misunderstood something obvious about its controls?

thank you again for walking me through this.

by the way the reading is actually 70kO one way round and about 25kO the other way round, with and without external magnet.

[benwest]

Re: Neff S51M63X1GB constantly cutting out

removed the door sensor and the reading across it is around 70 kOhm. what can we make of this? if that rules this out as a fault and we are back to the power supply suggestion could you let me know which part number on those exploded diagrams you were referring to and i’ll try and get at it (and get some pictures).

by the way the full dishwasher code is S51M63X1GB / 52 (as dave says these extra digits are required by the neff website)

thanks again all

[benwest]

Re: Neff S51M63X1GB constantly cutting out

much appreciated dave, will take a look this evening and post back here afterwards

[benwest]

Re: Neff S51M63X1GB constantly cutting out

thanks tim and martin. before i investigate dave’s suggestion (which is obviously going to be quite a task) how can i fully eliminate a potential door magnet issue? the dishwasher is in the middle of the room with its sides and decor door already off. where is the door magnet switch which could be causing an electrical cut out? centre top near the latch? when i get home again i will try and hold it shut or subtly relevel it etc to see if i can get any such change to make a difference. ben

[benwest]

Re: Neff S51M63X1GB constantly cutting out

thanks again dave. when you say “checked mains plug” im not sure what you mean, it’s a straightforward moulded lead similar to a kettle lead, plugged in firmly. fuse in the socket end is fine, is there some other circuit protection in the dishwasher? remember it does usually work after turning power off and on completely. so as you say a control issue more likely…

if this board something i could remove and inspect myself? or post a photo of on the forum? i’m reasonably competent at opening and fixing things but don’t want to start dealing with complicated electrics.

last question is there anything else like some other fault sensor that could trip the dishwasher in this way. as i said its not the flood sensor in the base, but is there anything else mechanical to check while its all open? thermostat? any other overflow sensors anywhere?

thanks for your help especially at 11pm on a monday! much appreciated. ben

[benwest]

Re: Neff S51M63X1GB constantly cutting out

thanks for your reply dave, i actually hadn’t but i have now, exactly the same situation.

i’m not sure if this is useful but after a long break (i first tried opening it up a few days ago then left it so it’s been untouched since then) it managed 15 or so minutes of a cycle before cutting out. but after a few more goes tonight of plugging/unplugging/manually draining/resetting etc. it now cuts out almost straight away, sometimes only lasting seconds. this difference is what initially made me think there was a leak or something of that nature, something accumulating slowly, though of course i could be barking up completely the wrong tree.

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