I had one like that, it was a 5p floating around in the tub, went a couple of times everytime would work when you pump and spin only, checked hoses and pump could not fault it and even changed pump again then found this illusive 5p in the end.
Pretty much associated with a pump outlet blockage or pressure switch problem I would think? The little pump outlet bleed pipe that goes to the dispenser worth a clean out as well as that drain outlet elbox unit and hose between that and the pump I reckon. 😉
I assume you have a WFF2000 Not a WFB2000. WFB is a very basic appliance with no fault indicators. Have you checked the drain spiggot under the sink to see if a button or 5p is acting like a butterfly valve?
Thanks very much to all for your help.
Going back tomorrow, armed with your advice and a steely resolve to sort this one out once and for all.
5p sss watch out 😡 Im gonna getya 👿