Dishwasher Pumps Water to Sink: Dealing with Clogged Sink and Riser Pipe in a Single-Family House

A problem with a clogged sink.
From the beginning.
Single-family house, everything worked for 6 years of living in the house – until now.
The dishwasher pumped water into the sink.
I dismantled the trap (No. 1 according to the drawing) of the sink and into the riser pipe in the wall 1m long (No. 2 according to the drawing) I inserted a 12-meter spiral.
I inserted several times some siphon came out. I poured water from the hose and in the ks well (No. 4 according to the drawing) I see that the water is coming down and quite quickly.
So I disassembled everything, unscrewed the water in the sink and suddenly I see that in the strainer appears water , which does not drain down into the well (No. 5 according to the figure) as it should but pours into the sink again.
I disassembled again, poured water into the riser of this 1m (No. 2 according to the drawing) and the water drains. I disassembled the siphon I let the water go, and it comes up to the sink again.
Another time I disassembled, cleaned the previously cleaned pipes of the siphon, overflow sink – unfortunately, the water continues to come up.
After about 11 m there is still a riser from the floor – water drained from the toilet, washing machine on the first floor perfectly flows into the sump.
In the same place the downstairs bathroom is connected (No. 4 according to the drawing). After draining the loo, the water flows perfectly.
My hands are already falling off.
Where to look for the cause

ps.
No moles and other inventions do not help.


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That is, how? The water to the sink after the drain is installed comes up the drain pipes "up"?

Maybe the drain from the sink trap is routed too high?
Post a photo of this trap along with the drain

Greetings.

If we assume that all the pipes from the sink - that is, siphon No. 1 up to sump No., 5 are clean, then the only possibility is that the riser to the sink is not vented. Probably such is not made at all. Are you sure it is unobstructed (not clogged ) such a small grating in the sink? It is an overflow, if too much water poured into the sink compartment, but at the same time acts as a "breathing" sewer.

Pipes I assume clean. The water is flowing and the spiral pulls out practically nothing.
Grate clean - the tube connecting the sink to the siphon ( the overflow one ) also clean. Removed and cleaned.
This installation worked for 6 years

Added after 2 [minutes]:

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And what happens if you pour a bucket or two of water into the sink?

I poured a bucket of water. The plug open - the water stands in the sink. I poured additional pressurized water from the garden hose, this water retreats through the overflow pipe into the sink compartment. In addition, the water backs up into the dishwasher - I do not know if this is important.

Unfortunately, it rather indicates clogged pipes. Did the adder show up in manhole #5?

Viper - the spiral is too short No good. then how can I make them more efficient? I am sure there is nothing artificial in there. If anything it's some kind of organic blockage.
The mole does not help.

Added after 2 [minutes]:

Of course, and now when I poured water in and used such a rubber aspirator there was such a puffing sound ( such a gul gul gul ) in the drain

Mirao wrote:

The auger - the spiral is too short

In fact.

Mirao wrote:

Well. then how do I unclog it?

Insert a sewer water hose into the wall under the sink. Seal it with rags. Keep an eye on it, and have someone else turn the water off and see if it flows in the sump.

Sooner or later every dishwasher user pays a tax on laziness. Firstly, tablets for dishwashers are getting cheaper and this is reflected in their effectiveness to dissolve fats and secondly, the dishwasher uses little relatively cheap water and not fully emulsified fats settle on plastics , in effect clogging drains. Mr. plumber with a long adder will come , take 500+ for unclogging and for a while there will be peace. .

And it occurs to me that the problem is in the pipe between the sink and the siphon, below the introduction of the dishwasher drain - a little unlikely, but ...
I assume that the siphon pipe is unobstructed, that the author checked it. Why do I say this, because if the pipes were clogged below, then after removing the siphon in the pipe would be standing water, and about this silence.
For my thesis is also supported by this

Mirao wrote:

O and now when I poured water and used such a rubber aspirator this there appeared such a puffing ( such a gul gul gul ) in the drain

if the pipeline was all filled with water, then in my opinion this gul, gul, would not be there.

I think the pipe is actually clogged. I removed the siphon and poured water directly into the pipe noi.... The pipe filled up Water came out where I poured it in No I will try to buy a longer spiral. If it doesn't help I will come back to you with the problem
Thank you all for your help .

I do not have a dishwasher but the length of the drain pipe fi50 from the dishwasher is about 2.5 m with a level difference of 25 cm but 2-3x a year I have to push it , not counting kettles of boiling water poured into the sink to improve water drainage. Sometimes it helps to pour boiling water into the sink and tap the trap, for example, with a sweep. During such an operation, gelatinous deposits liquefy and drain into the sewer. You need to be careful, because with such operations the siphon can leak if it is too weakly twisted, and bathing in hot water is not pleasant.

And tell me more.
Is spiral or tape better? I can buy 30m tape on the spot, and I will wait a few days for the spiral

A sewer cleaning weigher connected to a pressure washer is better, but if there are a lot of elbows, especially at a 90° angle, it may not go in either.

Mirao wrote:

Additionally, water backs up into the dishwasher - I do not know if this is important.

The dishwasher should have a built-in check valve - it could potentially fail.

If the drain is completely unobstructed then water has no right to back up into the dishwasher.