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Old 20.12.2017, 10:04
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Water coming back into dishwasher

Well, it's almost Xmas, as from tonight we'll have a house full of relatives and, typically, that's when the white goods start breaking down!


This year, it's the dishwasher. It works perfectly well, pump and all, but when it's off, about 3-4 hours later, water starts coming back in from the bottom (filter end). I took the filters apart all the way to the pump, no sign of blockage. I ran it empty at high temperature with dishwasher cleaning liquid, same symptoms 4 hours later.


I also checked the sink next to it, but it does not appear to be blocked, the water drains away fast and normal. Also there is not nasty smell of drains.


Any tip? Help!
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Old 20.12.2017, 10:13
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Re: Water coming back into dishwasher

Had this happen once as well. No idea what it was.
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Old 20.12.2017, 13:13
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Re: Water coming back into dishwasher

Check if the hose and it's connection to the siphon under the sink are clean.
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Old 20.12.2017, 13:19
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Re: Water coming back into dishwasher

How much water? On some models it's perfectly normal for a little water to remain/return in the bottom, but normally you'd only see this if you lift the internal filter cover. If it's coming over that then into the main area there's something wrong.

Also, is it dierty water or clean water? It could be the inlet valve leaking a bit. Possibly then mixing with said water residue to look like it's coming from the extraction part. Try turning off the water supply after draining and see if it still does it.
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Old 20.12.2017, 13:49
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Re: Water coming back into dishwasher

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Check if the hose and it's connection to the siphon under the sink are clean.
Let me expand on EdwinNL's comment. On our machine there is a final filter on the hose that connects under the sink. It is a type of flap with filter material. If this is jammed open with "something", it may let water get into the hose and therefore into the machine when you are running water into the sink.

Worth a check.

Another idea. Have you moved the hose at all under the sink (pushing stuff around for example)? The hose may be crimped or may be in a position where it can not clear completely.
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Old 20.12.2017, 13:49
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Re: Water coming back into dishwasher

Had this happen to me. There is a valve with a steel ball bearing that prevents water from flow back. The ball bearing may be stuck, or the rubber broke. If you can find it, usually at the bottom, you can first try to clean it out, or else replace it.

You can probably find a professional to fix it for you for about 200CHF.
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Old 20.12.2017, 14:14
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Re: Water coming back into dishwasher

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Let me expand on EdwinNL's comment. On our machine there is a final filter on the hose that connects under the sink. It is a type of flap with filter material. If this is jammed open with "something", it may let water get into the hose and therefore into the machine when you are running water into the sink.

Worth a check.

Another idea. Have you moved the hose at all under the sink (pushing stuff around for example)? The hose may be crimped or may be in a position where it can not clear completely.


I checked the hose under the sink and it all looks fine. The water today went well over the filter level. it is clear-ish. I can't spot anything like a flap you describe, but I'll have a look again.


When I run the dishwasher, the water is drained out completely. It's only 3-4 hours later that it starts appearing.
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Old 20.12.2017, 14:17
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Re: Water coming back into dishwasher

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Had this happen to me. There is a valve with a steel ball bearing that prevents water from flow back. The ball bearing may be stuck, or the rubber broke. If you can find it, usually at the bottom, you can first try to clean it out, or else replace it.

You can probably find a professional to fix it for you for about 200CHF.


When you say at the bottom, do you mean past all the filters? I found like a kind of wheel, but it was not clogged in with anything. Beyond this, it looks like dismantling beyond my (very limited) D.I.Y skills.


Wish me luck and thank you to everyone's for offered advice.
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Old 20.12.2017, 14:20
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Re: Water coming back into dishwasher

Try turning the water supply tap to the dishwasher off when not in use. This should get you through the holidays...
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Old 20.12.2017, 14:22
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Re: Water coming back into dishwasher

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When you say at the bottom, do you mean past all the filters? I found like a kind of wheel, but it was not clogged in with anything. Beyond this, it looks like dismantling beyond my (very limited) D.I.Y skills.


Wish me luck and thank you to everyone's for offered advice.
The ball bearing valve housing is typically removable, and somewhere near the water outlet. Of course this is subject to design. I have a Miele.

I saved the part. I can take a picture of it for you if you'd like. What kind and model do you have? You may be able to find documentation online.
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Old 20.12.2017, 15:02
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Re: Water coming back into dishwasher

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When I run the dishwasher, the water is drained out completely. It's only 3-4 hours later that it starts appearing.
The water draining out indicate your lines are clear and the pump works. The water flowing back in later comes in from out the remainder of your outlet pipes.

This indicates you have a stuck check-valve. The valve prevents flow back into the machine. May just need to be cleaned and reset, or replaced in worse case.

I find these kinds of things are often described on webpages and youtube videos. You ought to give it a search for your brand and model.
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Old 20.12.2017, 15:03
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Re: Water coming back into dishwasher

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The ball bearing valve housing is typically removable, and somewhere near the water outlet. Of course this is subject to design. I have a Miele.

I saved the part. I can take a picture of it for you if you'd like. What kind and model do you have? You may be able to find documentation online.
It's a Siemens SN
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Old 20.12.2017, 15:20
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Re: Water coming back into dishwasher

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It's a Siemens SN
Not familiar with that one. On my Miele, it snaps in place like a lego.

The check valve is normally a simple piece of rubber if you can find it. Look for a Youtube DIY on "Dishwasher Check Valve".
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Old 20.12.2017, 16:54
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Re: Water coming back into dishwasher

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The water draining out indicate your lines are clear and the pump works. The water flowing back in later comes in from out the remainder of your outlet pipes.

This indicates you have a stuck check-valve. The valve prevents flow back into the machine. May just need to be cleaned and reset, or replaced in worse case.

I find these kinds of things are often described on webpages and youtube videos. You ought to give it a search for your brand and model.


Fortunately for us, we live in a small village and there is a plumber. I called him, he called within 20 minutes, found out that there was no check-valve in the draining pipe, he fitted one and refused any payment...said it would be a bottle of wine at the next village fête. Hopefully it's done the trick. Maybe not such a crap day after all!
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Old 20.12.2017, 17:09
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Re: Water coming back into dishwasher



Hi Mc. This is a typical Siemens installation for dishwasher (+ Steamer).
Notice the drain pipes from the 2 maschines are fixed high above the "swan neck", at least 30cm if posible. The flex drain pipes should be fixed ( like photo, black wire) because the pipe will move, when the maschine is pumping. You have a black rubber tube which is between the flex-pipe and the drain. This must not be allowed to bend down. It could be that your flex pipe in not fixed and it is now hanging down lower than the outlet and water from the basin, runs into your dishwasher drain pipe . I hope you understand this!
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Old 20.12.2017, 17:19
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Re: Water coming back into dishwasher

Mc, if this is a small rubber flap thing, that he put in the pipe? Siemens dishwashers are not fitted to run with them! The waste waterpumpe has not the power to open this rubber flap for very long. If your dishwasher starts to have problems with pumping, take the rubber flap out again.
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Old 20.12.2017, 17:38
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Re: Water coming back into dishwasher

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Fortunately for us, we live in a small village and there is a plumber. I called him, he called within 20 minutes, found out that there was no check-valve in the draining pipe, he fitted one and refused any payment...said it would be a bottle of wine at the next village fête. Hopefully it's done the trick. Maybe not such a crap day after all!
How is it that it use to work without one, and then suddenlty not anymore?

The check-valve is normally at the bottom of the drain, not in the piping. Strange that it worked without one, leaving me to suspect the plumber jerry-rigged something temporary that may solve the problem only for a little while.

But it may get you through Christmas. Merry Christmas!
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Old 20.12.2017, 18:02
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Re: Water coming back into dishwasher

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Hi Mc. This is a typical Siemens installation for dishwasher (+ Steamer).
Notice the drain pipes from the 2 maschines are fixed high above the "swan neck", at least 30cm if posible. The flex drain pipes should be fixed ( like photo, black wire) because the pipe will move, when the maschine is pumping. You have a black rubber tube which is between the flex-pipe and the drain. This must not be allowed to bend down. It could be that your flex pipe in not fixed and it is now hanging down lower than the outlet and water from the basin, runs into your dishwasher drain pipe . I hope you understand this!


This is super clear, thank you. As I said, hopefully the plumber mended it, but I'll keep an eye on it, as the flex drain pipe is not fixed with wire or anything, although it seemed high enough to me. Thanks for all the useful tips.
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Old 20.12.2017, 18:06
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Re: Water coming back into dishwasher

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Mc, if this is a small rubber flap thing, that he put in the pipe? Siemens dishwashers are not fitted to run with them! The waste waterpumpe has not the power to open this rubber flap for very long. If your dishwasher starts to have problems with pumping, take the rubber flap out again.


Thanks, I'll bear that in mind. Yes, the description you give fits what I saw him put in the flexi drain pipe.
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Old 22.12.2017, 16:49
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Re: Water coming back into dishwasher

Damn! It hasn't worked! In fact, emptied a full washbasin of water this morning despite the fact the dishwasher had not run yesterday. I called Siemens but of course the earliest they're going to come is 29th December.


What did you do for Xmas? Scooped and Sponged my dishwasher out! Will be far more festive with a green sponge and Santa's hat on on 25th December!
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