Vaillant ecoTEC plus 418 - Page 55

Green/yellow (earth) wire – boiler terminal Earth
sign Blue (neutral) wire – boiler terminal N
Brown (live) wire – boiler terminal L
CAUTION:
Do not connect any mains 230V power to the connections 7-8-9 or BUS (+,-).
NOTE:
Ensure that the wires are securely fixed in the terminal block.