Kitchen Sink water flowing into washing machine drum.

hhhisariel

Hi. Just had a new mashing machine installed, now every few days after washing dishes the water ends up inside the washing machine drum. Any ideas? I know nothing about DIY but the thick white twirly pipe is beneath the sink and the grey pipe leads to the washing machine.

doningtonphil

Hello. So the thinner grey hose is the mains water feed to your washer, the fatter ribbed hose is the waste from your washer feeding in to your sink waste. The white 'twirly pipe' it is connected into has a u bend to trap water in it to stop smells from the sewer. Imagine dirty water leaves your sink. To actually make it to the drain outside it has to fill up the bend and then 'overflow' in to the highest point of the twirl pipe before plunging down and then out of the wall at the back. It looks like your problem is that the ribbed waste hose is lower than this high point so as the water level increase as it tries to 'escape the u bend' it actually reaches your waste hose first so goes down there.  If you use and empty the sink many times between using your washing machine then it is possible that your washing machine drum, which is lower then this white twirly pipe could fill with water. 
I am guessing to stop this you need the grey ribbed pipe to travel 'upwards' so that part of it is higher than the high point if the white 'curly pipe', so the water reaches the correct route before getting high enough to use the grey ribbed pipe. 
I've had a G&T, does the above make any sense?

doningtonphil

If you look at other traps with an appliance connection, the appliance connection is always higher than the top of the 'curly white' pipe. Such as
https://www.screwfix.com/p/mcalpine-wm15-appliance-trap-white-40mm/5849v
If you have any slack on the ribbed washer waste hose (gently try pulling more through the hole in the cabinet,), you could twist the connector (which the ribbed pipe is jubilee clipped to) around so it points upwards rather than sloping down as it currently does

FreeBear

doningtonphil said:  you could twist the connector (which the ribbed pipe is jubilee clipped to) around so it points upwards rather than sloping down as it currently does

An image to illustrate the above point -

Also check to see if there is a rubber flap inside the white plastic spigot - There is often one there to act as a non-return valve.

The curly WM waste pipe should also be clipped on to the side (or back) of the cupboard to stop it from dropping down again.

When you do an online review of the WM, mention that the waste pipe was badly installed.

[Deleted User]

This worked for me https://forums.moneysavingexpert.com/discussion/comment/77623705#Comment_77623705

doningtonphil

FreeBear said:

doningtonphil said:  you could twist the connector (which the ribbed pipe is jubilee clipped to) around so it points upwards rather than sloping down as it currently does

An image to illustrate the above point -

Also check to see if there is a rubber flap inside the white plastic spigot - There is often one there to act as a non-return valve.

The curly WM waste pipe should also be clipped on to the side (or back) of the cupboard to stop it from dropping down again.

When you do an online review of the WM, mention that the waste pipe was badly installed.

A picture speaks a thousand words! LOL