What to check
The ID switches in each phone need to be set to match the button on the door panel.
Generally we build panels with the top button dialling ID 1.
Corrective Action
The 8 switches are in binary and so the total value must add up to the ID number required.
Additional notes
See page 14 of the installers notes booklet..
Links
https://www.entryphone.co.uk/pdf/WD5_P1.pdf