I,ve got one doing the same i think it is the flow meter on the left hand side, i checked wiring at door 1st as the last time i had one with this fault it was a broken wire, no broken wires so i’ve ordered the flow meter.
Oddly enough, I had a broken wire inthe door on this and thought I’d found the prob but no change. I’ve heard about these flow meters causing trouble but I’ve yet to replace one, sounds like that’s about to change!
Changed the flow meter assembly and removed the wires from the board to the reed sw. and checked them and they’re good.
Still the same problem.
I’ve no manual for this so I’m not sure if there is a reset or a test programme.
I’ve adjusted water pressure to see if it would help and I cleaned out the pressure sw chamber.
Still no help.