Bosch Series 6 showing error tap symbol
I've got a 3 year old Bosch Series 6 (model SMW66JX01A/01) which is not draining completely and is showing the tap symbol error.
I cleaned the filters, checked the impellor for blockages as well as cleaned drain hose (which were all pretty clean already btw). Then I ran a full cycle without any issues (so the pump appears to be working fine), however, the cycle after that gave the error again. I noticed it leaves about 2cm of water in the area where the impellor is. If I take this water out the next cycle will run fine, if I don't take that water out the next cycle will not complete, the tap error symbol will show and there will be water left in the bottom of the dishwasher (which gets pumped out fine if I turn the dishwasher off and start a new cycle).
Any suggestions of what I should look at next?