Bosch Dishwasher - CLASSIXX - constantly draining.

Mozmoz · 25 Dec 2012

Hello,

I found a sort of refference to this one, but I can't understand it, so hopefully someone will respond a little more in detail for me.

Great day for it to happen, but today (XMAS day), my dishwasher has failed.
I came back to it after about 30 mins of switching it on, and it's still draining.
I've cleaned out the filters at the bottom, lifted out the mess thing and the cylinder filter, and underneath is a hole for the drainage, which seems to have water squirting in from a nozzle at the side (maybe this is how it fills).
It's constantly draining there - even with the door open, if it's switched on.

I've poured hot water down with force, had my hand in, and can find no blockages.
I've unplugged it, left it off, and still the same issue.

Anyone got any ideas?

Oh - and eventually the 'Check water' light comes on.

zipper · 25 Dec 2012

Sounds like water on the baseplate & the antiflood device has been activated....
Pull the DW out enough then lean it forward to drain off the water (put some old towels down first). You ought to be able to restart it once the water is off the baseplate but if it happens again you'll have to track down the source of the leak. If you need to post again include the machine E-number (laser engraved on the upper door lip).

Mozmoz · 25 Dec 2012

Hi,
Thanks for the reply.
Do you mean that I should tip it forward enough with the door open so that some water comes out?
There doesn't appear to be much water inside, it's certainly clear to the bottom of the hole at the base of the dishwasher, and when I fill it with water, it drains...
The E number is Sgs45co2gb/06.

Could you also explain what you mean by looking for a leak? How would that affect this?

zipper · 26 Dec 2012

No...I don't mean emptying the water from the inside of the machine with the door open.
Most likely there is water on the baseplate & you can't see that from the outside.
So you have to tip the DW forward (or backward) with the door closed to evacuate the water from the baseplate & reset the antiflood device.
An internal leak could come from bad wash motor seals, blocked matrix/pressure chamber, leaking hose etc...none of which is visible to the end user.

Mozmoz · 26 Dec 2012

Thanks for explaining this - I tilted it about a bit and it's now working - done three loads since, fine - saved some xmas hassle, so thanks very much.

I guess it could be 'one of those things' but if it ends up doing it again, is it a complete pain to sort of the cause?

zipper · 26 Dec 2012

If it happens again then I would suspect it is either leaking from the wash motor seals or the matrix/pressure chamber is gunked up & water is leaking from there. This model should have a removable baseplate & if it was a slow leak from the wash motor seals you would see tell-tale signs of leakage on the plate. If that looks ok then you could remove the LH sideplate & check out the matrix/pressure chamber for blockages...or run it with the sideplate off & look for leaks during a cycle. Leakage from both these areas are fairly common on Bosch dishwashers.

erabowman · 27 Dec 2012

Just recently I had this problem. When the machine was tipped forward I got a pool of water escaped and the machine worked OK for a couple of cycles. When I removed the left hand panel, I could see there was a lot of grunge in what I now know is the pressure chamber, this was causing water to overflow into the tray in the base. This operates the switch which causes the pump to run continuously. I ordered a new chamber which cost about £25. After fitting it the machine cycled ok , but I noticed the when it was filling the water came in short pulses. When I checked further I found that the hose out of the pressure chamber was almost blocked with limescale. I got a replacement for under £4 and the machine now runs like new.
I was nervous about doing all this but was encouraged by the guidance that I found in this forum and saved myself a packet on the way.
Incidentally I found a video about changing the pressure chamber on YouTube. It was not for a Bosch, but a Seimens which seems to be almost the same under the hood.

Mozmoz · 27 Dec 2012

Thanks for this - great advice.

I think I'll check this at weekend - we don't have limescale, but we're not exactly careful before we stack the DW, so I expect something is gunged up.

Could you answer the following, if you know the answer -

1) I take it it is the left hand panel as you look at the DW?
2) How does it detach? Do you take the top off first?
3) Where abouts is this chamber? probably be apparent when I have a look, but the benefit of your experience would be useful!

erabowman · 27 Dec 2012

Hi

The model I have is a SGS55C02GB/01 yours may be different
The gubbins you want to get to look at are behind the lefthand side panel which I removed l as follows.

Open the door and there are two torx screws on the left frame.
When these are extracted you can remove the panel by grasping the two top corners and pulling it away at the top to release the lip which inserts under the machine top.
When clear of the top, lift the panel to clear the lip at the bottom.
I have seen it said that you need to remove the top, but in my case it was a loose fit and so I did not have to. Your mileage may vary.

I have a picture of what it looks like in my album ( Bowman pics)
(Sorry can't figure out how to insert a picture link )
The insert on the piccy shows the actual pressure chamber.

When I ran the machine with the side panel removed I could clearly see water finding its way out of the pressure chamber and running down into the base.

You can find exploded spare parts diagrams on the Bosch website.

As I said previously I was very nervous when I started, but it seems quite straightforward once you get going.

Goes without saying, turn water and electricity off before delving in.

Good luck. I'll be interested to hear how you get on.

Mozmoz · 27 Dec 2012

Thanks, I think I'll run it with the panel off at weekend and have a look - I know, it's a crazy life I lead.

There are a few videos on Youtube of various Bosch machines with the panel off, and one guy cleaning the chamber with a syringe of hot water mixed with soda crystals (Dishwasher p0rn

)

I'll let you know how it goes.

M waim · 23 Oct 2015

just wanted to say how brilliant the internet is, we have the exact same problem you had here and also finding the solution to the problem on the same page was great, thanks for the help even though it wasnt originally meant for me.

Paulb2016 · 24 Jan 2016

I had the exact same problem. Ended up stripping the whole dishwasher and it turned out to be the salt container had came loose from when i was filling it. I accidentally loosened the nut that keeps the rubber washer tight against the base and it was leaking on to the under tray causing it to drain constantly. Good as new now.

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Bosch Dishwasher - CLASSIXX - constantly draining.

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