Grant register installer here.
Simple answer link pressure swith out they haven't been fitted to new Grant combi's for several years.
We remove them every time we find them mostly because when your working on boiler they are renown for snapping off!
From memory the pressure switch connections are 15 and 16 on board just take out pressure switch connections and insert link.
If that don't do it it's the board.
Absolutely take wires out of board replace with link
If you do any work on system and have to drain or even just get rid of pressure that's time to remove switch.
It's threaded 1/4 bsp so you just need a 1/4 plug.
If I just snip the wires a couple of inches from the switch, bare back and connect together, I take it that would work too? I'm just trying to avoid taking the board to bits if I don't need to.
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