RW wrote:

Sorted that problem, ripped and stripped everything waterside.
Cleaned, reseated etc etc....Superb jets of water internally !

I didn't see the original discussion of this, but in our dishwasher
occasionally lemon pips would find their way into a jet of the spinning
arm. This would either block a horizontal jet and affect the spinning
directly, or or block a vertical jet, thereby unbalancing the arm, and
causing it to press against the basket above, also preventing it from
spinning.

Unpopped popcorn kernels can play the same trick.

Daniele