Help diagnosing Bosch dishwasher impeller jug fault

[Pistol]

Hi, I have a Bosch semi-integrated dishwasher (SGI45E15UK/14) which seems to have a faulty impeller jug.

When I attempt to run a wash cycle, the machine fills, then the drain pump runs ejecting a small quantity of water, then it fill again, drains, fills etc. The check water light comes on and it just repeats this cycle ad infinitum. Running the reset program drains the machine out OK.

It does sound very much like the impeller jug fault would make the most sense – if the controller can’t tell how much water is coming in, it will just carry on filling, trip an overfill switch, carry on filling, trip the switch etc… I had a look to see if I could get the impeller jug out to see if it was seized up, check for the presence of a magnet, and attempt to test it with a multimeter and magnet, however I couldn’t get access to it to remove it without disassembling things which I was loath to do.

I have taken a video of the dishwasher, it would greatly be appreciated if some of you appliance gurus could have a look and reassure me that I have correctly diagnosed the fault?

If I knew it was definitely the impeller jug, I wouldn’t feel quite so reluctant to start taking things apart to fix it – but that brings me to my next dilemma. How do I actually get access to the impeller jug?? I tried turning the dishwasher on its side to see if the bottom panel would come off easily, but it doesn’t look like it will – I’m almost certain I’ll end up buckling it should I attempt it. One other option could be to remove the aquastop filling hose cover plate, I reckon I could just about get a hand in that way, but it would be very very tight… Any guidance on how best to do this?!?

Actually, I just had a thought: if the impeller jug is seized, would a flush of hot water help free it up?

The plumbers installed two cold appliance supplies and one hot appliance supply under the sink – the hot doesn’t get used for anything. I could temporarily connect the dishwasher up to the hot connection and run the pre-rinse program. That would flush the impeller jug through with hot water without havingto dismantle anything. The dishwasher presumably wouldn’t care whether the water was hot or not, I don’t think it would be trying to heat the water on the pre-rinse program anyway – would it?

My only concern is whether hot water going through the aquastop supply hosewould do it any damage, with it only being specified for cold water…

[Martin]

Re: Help diagnosing Bosch dishwasher impeller jug fault

OK, first off, the Impellor Jug is at fault.
Don’t fuff around with it, just replace it
It’s easy to access (I can see it in your photo in fact) with the side panel removed and the inlet valve unclipped. A gentle application of a little heat from a hair dryer will softener the plastic hoses that attach to make replacement child’s play.

I’ll leave that with you…….. 8) 😉 😈

[Pistol]

Re: Help diagnosing Bosch dishwasher impeller jug fault

Thankyou Martin! Will order a new impeller jug right away.

For removing the impeller jug, I can easily unclip the hose from the matrix/reservoir/thing-on-the-side-that-fills-with-water, then I assume if I unclip the plastic cover at the rear where the aquastop hose enters the machine (this thing:)

-and being careful of any wires that are still connected, I should be able to withdraw the hose with the impeller jug attached from the rear of the machine, enough to replace the jug?

[Martin]

Re: Help diagnosing Bosch dishwasher impeller jug fault

Yes.

[Pistol]

Re: Help diagnosing Bosch dishwasher impeller jug fault

Impeller jug replaced, and the dishwasher is away and working 😀

I had a devil of a job getting the old jug off, as I expected – these things never go straightforward for me!! It just didn’t want to come off the white aquastop supply hose. Even with a hairdryer it just wouldn’t budge a millimetre. Eventually, twisting it to “break the seal” so to speak achieved results.

Thanks for your advice Martin!

[Author]

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