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Boiler fires with yellow/red together.

Right so; Red to Blue: 0v Red to Yellow: 240v Red to Green/Yellow: 240v Blue to Green/Yellow: 0v I can't say I know how to do a continuity test but that feels as though the neutral isn't working as it should be. I know connecting that neutral is beyond what I'm comfortable doing but I just...

By neutral I meant 0v when tested against earth, I understood it to be the path for the live. |-W-|-----/  ----| N - L - 1 - 2 - 3 |      |               | ^ a rough translation of the wiring diagram on the unit. I put blue in (N), red in (L) and yellow in (3). Green/Yellow - 0v Earth...

Old one didn't have any numbers on it. Previous model was a 2 wire jobby with the blue taped up.

Trying to wire up a new Drayton RTS2. My thermostat cable comes through as: Red - Live Yellow - Neutral Blue - Neutral Green/Yellow - Earth I've tested voltage on the lines and validated blue and yellow are indeed neutral. I've wired it up as follows: N - Blue L - Red CALL - Yellow...