The first four digits are how many washing cycles it's done; the F numbers are all fault codes; and finally, the V code is the software version.
So your machine has done 4,986 washes; and has the fault codes F6 (not filling), F4 (inner door open), and F5 (not draining).
I had these codes once and think it had to have a full service, but Dyson are no longer sending engineers out to these.
Hope you get it fixed. Mine had done nearly 9,000 washes so there must be life in yours yet!