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Boiler is constantly on

Hi guys! set up my Tado to my boiler yesterday but the controller isn't turning the heating off when I tell it to through the app. I believe I have wired it all correctly. I have a Vaillant Ecotec Pro 28 boiler and I have wired it up as such:

Brown cable (live) in node 3 of boiler and L node on Tado

Grey cable (not sure what it's called) in node 4 of boiler and CH NO node on Tado

Blue cable (neutral) in node 5 of boiler and N node on Tado

and I put a bridge connection between the L node and the CH COM node on Tado.