I purchased a second hand small Sweetwater spa a few months ago. I checked it out before purchase and it did heat up although a bit slowly. Figured since it is a 110 volt spa it was normal. We moved it (rolled) and set it up and seemed to work ok for a few weeks. Then noticed that it was not coming up to temp. Unplugged the unit to maybe reset it and it worked for a little longer. Now it only gets kind of warm and the display reads - 08. Now none of the controls work. No lights,jets or heat. Can someone please give me some ideas on what is wrong and how to fix it ? Thanks.

That's not an error code I'm aware of. I think it just means your control box is malfunctioning.