We may have found other answers which could help you.
Click here for Drayton Thermostat Workingis it possible to repair a non digital Drayton SM2 timer?
Drayton Digistat +RF Model RF-601?
how can i fix thermostat?
Digistat Drayton connection?
Drayton sm2 timeswitch?
how to replace batteries in my Drayton Digistat RF1?