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Y plan only works when nest is in manual mode and valve is manually opened. Done some electrical tests. HW ONLY - Orange 130v, Grey 240v, White 130v CH ONLY - 240v on all BOTH ON - 240 on all BOTH OFF - Orange 130v, Grey 240v, White 130v Could this be a faulty nest heatlink?

I’m replacing my wiring centre, y plan system, i have 2 3 core cables & 2 4 core cables coming from the wall, the 3 port and cylinder stat are in the cupboard with wiring centre, whats best way to work out whats what coming from the wall, i’ve found the room stat, im assuming boiler, pump and ...