HI ALL my names phil electrician from liverpool. i have been trying to get this cm927 wireless controller to work on this brand new vaillant combi boiler. checked all wireing link took out from 3 4 and sender put in there place. pn from fused spur to sender 4c and earth used to boiler pn to boiler other 2c for terminals 3 4 there is a neutral terminal 5 but looks like its just for thermastat. when unit downstairs is in the off pos boiler still running any ideas would be great owner said it worked fine with his old boiler