We may have found other answers which could help you.
Click here for Ignored Baxi CombiHelp to fix a room thermostat, please?
How can I override code I can't remember?
Drayton sm2 timeswitch?
drayton digistatrf1 wireless system?
how to replace batteries in my Drayton Digistat RF1?
Drayton Digistat +RF Model RF-601?