Eddie

I got an Image Renew spa almost a month ago and the heater works fine sometimes then when we turn it down to save energy it shuts down. It displays an SL code on the panel and that by reading in other places means sensor left which is not an error code in my owners manual. Others say that my tub is in sleep mode. However the SL is not explained in the owners manual anywhere. Could someone please help i'm pulling my hair out with this tub?