Could anybody please tell me which terminals a roomstat should be fitted to the above boiler or be able to tell me where I can get a manual for it. Thanks
terminals 3.4.and 5 are for the roomstat, to be more specific you will need to say which stat you are using, as each stat has its own variaition,
You can get the manual from Vaillant http://www.vaillant.co.uk/homeowners/service/literature-downloads/ PTFE