While you wait for answers, we may have found some information which could help you.
Click here for Link Storage HeaterHow to adjust automatic timing of the creda automatic heater model 79151?
Creda Storage Heaters?
Heater not turning off?
Storage Heaters - Creda 79141 and 79151?
need diagram for Creda Comfortair AB heater problem?
Creda Night Storage Heater 79065B?