Washing Machine Hotpoint Ultima WF 860 1600 Spin?

When the washer finishes its wash cycle, it drains the Washer. Then just before it starts or tries to start its rinse cycle, we also get the ERROR CODE F03 and you cant even turn the washer of using the on off switch. We have to unplug it from the mains.
We also have just had an engineer out who has looked at this forum, and acted on some of the usefull information on it.
We then put the washer on its wash cycle once again and eagerly awaiyed the results. Oh no we once again get the ERROR MESSAGE F03 at the end of the wash cycle.
He says he will investigate further, in the mean time though we are up the creek without a paddle...can someone please shed some light on this for us???.
Ian & Denise.