2: There is a blockage somewhere after the pump, either inside the drain hose or in the connection that the water discharges in to under the sink -
A button of a specific size could be small enough to get past the pump
and into the drain hose, but be too large to pass through the drain
hose or through the plastic spout on the u-bend that the drain hose may
be connected to ( see picture of a typical u-bend sink adapter for plumbing a washing machine into
).This could completely stop water from being pumped out, or it could
even manifest as an intermittent fault. I've seen several cases where a
button is jammed halfway up inside a drain hose or in the opening of the
plastic spout of the u-bend connection but it spins round and acts like
a butterfly valve. When swiveled round one way water can get past, but
then the water flow can swivel it round again so that it stops the water
flow. To check for this you'd need to disconnect the drain hose from
the u-bend and examine the end of the drain hose and inside the spout
itself to check for blockages.
If necessary, the drain hose can also be taken off the machine to see
if you can detect any obstruction. I've managed to clear some large
obstructions by shoving the end of the drain hose onto the cold tap at
the sink and turning on the water. Be careful though, you can easily end
up spraying water everywhere. I use a large dishcloth over the hose and
hold on tight. If there's no blockage though or it's something that's
swiveled round and not closing off the flow you shouldn't feel much
pressure.
3: The pump itself is faulty -
If the impeller is broken it could be spinning on the shaft. In other
words although the pump rotor is spinning it is not turning the impeller
that forces the water out or due to slippage on the shaft it is not
turning fast enough. The pump could sound like it's running but in fact
it is not revolving at speed inside, however, I would expect it to sound
different to normal.
It's even possible for the pump to be oscillating instead of revolving
because of a fault causing it not to spin properly. You would have to
use your imagination to find out if either of these are the case. It's
relatively rare.
4: Finally - Watch out if your problem has only
occurred after connecting the washing machine to new plumbing after
moving house or after someone has put new plumbing in your current house
and after connecting the washing machine it will not drain when it did
before - Watch out for the blanking piece in new plumbing installations - particularly at new houses
Related pump troubleshooting advice: Washing machine won't empty water (From DIY repair help common washing machine problems) ' The water won't pump out of the washing machine (question 6 on this page)
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