Washer U Bend

[Man0ra]

The pic is of the u bend in my daughter's 1st floor flat and the washing machine attachment. Despite thorough cleaning and descaling the washing remains wet after spinning. A friend suggested the u bend is too deep for the washer pressure. Is thus a thing?

 

[oldbuffer]

1. Wouldn't have thought trap depth was an issue. The pumps are pretty powerful.
2. If the flexible waste hose from the washing machine is not brought up to just below the level of the work top to fall again into the trap, water may be caught in the hose as it never reaches the trap, and falls back into the machine.
3. Other than that it could be:
3.1 A partial blockage in the washing machine waste hose.
3.2 A partial blockage in the drainage pipes. Try filling the sink with water, then letting it out. If is takes a long time to clear it could point to a blockage. Start by removing and clearing the U trap itself.

 

[Hugh Jaleak]

I'd check the drain filter on the bottom of the washing machine first, if this is blocked it wont be able to pump the water out. Be prepared for a flood though, if it is blocked, the water trapped in the machine will make a break for it when you start to undo the filter access plug.

 

[Madrab]

A friend suggested the u bend is too deep for the washer pressure

Rubbish - don't listen to your friend

Is there water visibly left in the machine drum once it's drained and spun? - Is there a change in the pump noise as it gets to the last of the water left in the machine, it's a pretty apparent change.
Run a test, put the empty machine on a rinse cycle, let it fill a bit, stop it, turn off and then back on again and then onto a spin cycle. Listen as the pump empties the machine - you'll hear it gurgle in the sink waste - then listen for the pump sound changing as it get to no water left in the sump as it empties out - if it does all of that ok then I'd suggest it isn't a drain issue more it isn't spinning properly/fast enough.

 

[Man0ra]

Filter checked as part of the clean. Will try filling sink and running machine empty. Thank you.

 

[JohnD]

The hose is pushed onto a spigot. Pull the hose off and look at the spigot to see if it is clear.

Show us the route the hose takes, relative to the height of the sink.

 

[Man0ra]

We have now checked everything. We then got the maintenance man to check and the machine and hose are fine. Apparently it's the drains. When the building was converted from offices the plumbing was botched.