Drayton LP522 CH weekend timer not changing

[LauraKate]

Hi
I have managed to set our Drayton LP522 CH M to F, using 2 of the 3 ON/OFF settings. But when trying to set the weekend times, the timer won't work, so we have managed to set ON1/OFF1 but the - or + won't work to set ON2/OFF2 or ON3/OFF3. we re read the manual and watched a number of video clips, but still really confused as it why the -/+ buttons work to set for during the week, but won't for the weekend.
Any ideas at all?

 

[Knappers]

There's only really two options here.
1- your not doing it right and need to check manual again
2- it doesn't work and you need to get a new one