simple in most cases its just the filter outlet has becopme full of day to day junk, debris and slime.
Slowly release the water by turning the handle to release the water. Ensure power is off.
Once water has been drained into a shallow tray you will be able to open the door.
Once the drum is empty, unscrew the handle completely to remove filter housing an clean out thoroughly.
replace and tighten up.
Turn on power and reset all programmes.
this should work, total cost about 15 minutes of your time.
If it doesnt work it may then be your pump, time to think about and engineer
Dave
August 2009