F05 error code of Hotpoint wasing machine?

Hotpoint 960 washing machine has F05 fault again, managed to get it to do a spin to release water and then checked and cleaned hose and pump for 2nd time, nothing really found just minor gunge on both occasions, wash started again and had couple since all ok but now intermittently gives the F05 error and stops, could it be a pump problem not a blockage, everything appears clear and this is really frustrating. Is this consistent with pump failure, as i will replace, or is it likely to be something else like sensor issue or ....?