bosch maxx - can anyone help?

Im having a real problem with the water not draining way from the machine?When u set it to drain or spin it makes a clunk sound and u can hear a motor going but still the water stays. i have checked the filter removing it and cheacking for blockages. Still the water wont drain away?? I have had the back off and checked for blockages round the other pipes too - still nothing??Still the water wont drain away?? Please help cos i got school uniform to wash!! lol