My Husqvarna Emerald continuse to stitch after I release the foot pedal. Although the stitching is at a greatly reduced speed it won't stop unless I turn the machine off.

It sounds like the food pedal is sticking. I have had this happen only to find that the pedal had drifted under my mobile thread drawer and was unable to lift up when I took my foot off it - yikes - looked like a ghost was operating my machine! However, it you are sure the foot pedal is not stuck under a piece of furniture, perhaps the spring inside is not decompressing completely. It needs to be checked. I am not that familiar with the Emerlad models - do they have a Stop/Start button on the machine itself? If yes, perhaps this button is stuck in a little? Check that also.