Had my three way valve replaced last week for similar symptoms. You can often wiggle the slider to change the valve position, or a sharp clonk with a hammer can dislodge some carp, either of which may be a temporary fix.
But it'll likely stick again. Had mine replaced with a half decent one - £120ish plus fitting. it took not much more than an hour to do.
AIUI The boiler generates hot water which is shifted round by the pump but if the hot water never goes anywhere because the 3 way valve is stuck on water then the pump will not know to fire up.
I was planning on power flushing my system soon and this just reinforced the idea, as I'd when they changed my cylinder in the summer they identified sludge. I put some sludge buster in the system which can be there for up to four weeks, then will flush it in early Dec.
But I'm no expert.
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