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Miele W842 - drain pump keeps stopping, but no blockage

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by marklensman » Wed Aug 01, 2018 3:30 pm

The drain pump runs for a few seconds, although it sounds like it's struggling, then it stops and the "Rinse" light flashes.

There's no obstruction in the pump that I can see when I remove the filter, and the problem occurs even if I run a rinse cycle with no water in the machine and the filter left off.
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by electrofix » Thu Aug 02, 2018 11:54 am

it sound like the machine thinks there is still water in it possibly

there is a small rubber tube that connects to the panel to detect water height

find this tube and as a test disconnect it from the panel, set a rinse programme and see if it starts to fill. If yes switch off, drain and follow tube to the bottom of the machine where it will be blocked in the pressure chamber it connects to

if you do blow in the tube to make sure its clear do not blow through it while its connected to the panel as it damages the sensor

Dave
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by 1totalshambles » Fri Aug 10, 2018 5:18 pm

One thought! These things are fitted with a magnetic Askoll style of pump. Could simply be the pump bearing has worn out. If so the impellor would have a distinct amount of side play. Some Bosch pumps on older models fail the same way.
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by marklensman » Sat Aug 11, 2018 9:23 pm

Thanks guys. I'll check these.
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by marklensman » Sun Aug 12, 2018 2:00 pm

EDITED.
OK, I removed the pump. Miele 5012770 (DPS 25-041, 30W, Hanning EW)
https://www.dropbox.com/s/vxa2bgcrfkhu1zq/Miele%20pump.jpg?dl=0

There is a very slight rattle if I run the pump free from its housing. It still stops after 15s or so, and the warning flashes.The warning flashes after 15s into a drain cycle even with the pump totally disconnected, so it's not some mechanism that detects excessive pump current.

BTW, there was no cotton thread etc wrapped around the rotor. I did find some tiny metal parts in the housing that had escaped my attention when I cleaned the filter - (a dressmaker pin and two small spectacle screws) - these perhaps account for the erratic "struggling" before.

@1totalshambles
There's no side play at all on the rotor. When rotating the impeller, apart from the expected cogging from the magnet, there is a smooth frictional drag as if there is a silicone rubber seal on the rotor. Is this normal?

@electrofix
I disconnected the tube from the panel - I could blow through it OK from the freed panel end.

On reflection, I'm puzzled that the machine would switch off the pump if it thought there is water still in it.

I'd expect it would switch off if it thought there was NO water in it, but I can't understand why it would flash a warning light in that case.

I haven't tried filling the machine, as I know it won't drain.
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