Newbie Needs some Solar Thermal help

[Jon_viola]

Hi

 

Ive recently moved into a house with a solar hot water system. It has a RESOL controller. 
 

Despite having the manual and generally being able to sort these things myself I cannot get the controller to adjust to the settings I’d like. 
 

is there a way of factory resetting them?

 

anything I’m missing?!

 

 Thanks in advance. 

[Marvin]

Any use:

 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.resol.de/Produktdokumente/48005931_DeltaSol_BS_Plus_V2.monen.pdf&ved=2ahUKEwjO-9HorM_yAhX-h_0HHeXJBEcQFnoECAgQAQ&usg=AOvVaw2heYqDTppJTSYgTXHhY1qs

[Onoff]

@scottishjohn has plenty of experience of ST.