Hi guys got a Neff dishwasher displaying E21, what i can gather from error codes is a circulation pump or blockage fault, when it is started it will drain then fill but when it starts to wash it starts to circulate the water then cuts out about 5 or 6 seconds later it tries again does this about 5 times then throws up E21, i didnt have time to dismantle kitchen to get out, can anybody help please cheers JJ