DiplomatADP8322 F7 CODE

Hi. My diplomat adp8322 d/w stopped working without warning. Got an engineer out who looked at d/w and told my wife that it needed a new washer motor and that it would be cheaper to buy a new machine. Unfortunately I was at work and not able to speak with him. On investigating further myself the d/w is showing a code 7 on the led’s. I have checked for blockages and found that there are none visible. Water flowing to d/w ok and filters clear. After looking on forum I have checked flow meter reed switch which appears to open and close (using a multimeter and magnet). The flow wheel seems to rotate ok. Can’t test the flow pc board which forum suggested as a possible fault. Other option sems to be water valve, although water getting through. The engineer who looked at it initially didn’t pull d/w out of housing and only removed lower front metal casing section. Then told my wife about the need to replace the motor and left with a call-out charge in his pocket. Nowhere have I seen any mention of the need for a motor on an F7 fault. I don’t want to replace the motor un-necessarily. The d/w looks in generally good condition and should be fixable at a reasonablely economic cost if I can be guided to the correct fix. Help and advice would be gratefully received.