Join Date: Jun 2007
My Motorhome: Hymer Exsis-i 504
Thanked 559 Times in 530 Posts
Hi gisela and welcome to the forum.
By the computer part, do you mean the control panel which is often above the hab door? If so it might be a good idea to post a picture of it.
On mine the hab temperature can be set to a low of 5į - lower than that, the only option is OFF. That's probably to protect your water supply in winter - most boilers are set to dump water in and around 5į to prevent frost damage. That's not a problem in summer of course (or shouldn't be!)