Hotpoint Wdd960 F05 Code Intermittent - Washes On Dryer Cycle?!

Hello,

My mashine started acting up ...water left in the machine after a wash cycle but seemed to drain when i used the manual pump out option , showing f05 code these were intermittent issues and sometimes it worked fine. I had a repair man out to look at it he just said he had cleared the pipes and couldnt find anything wrong and charged me £60 for 10 minutes work...ouch!(even though I had checked the pipes and filter myself previously). The f05 error still occurs occasionally and the water remaining issue also. Another weird thing is that if say I set a wash then a dry cycle after the wash completes by the dry cycle washes again instead of drying? Even if i set just a dry cycle without a wash beforehand it does a wash?! Can anyone advise?! Please help I feel im going crazy! (maybe my hormones as I am pregnant! I just want a workign washing machine before the baby comes!) thanks in advance!