Continuous turning over of DELL C1765nfw

My Dell C1765nfw Printer regularly gets itself into a chugging mode, it sounds like an engine continuously turning over , the sound eminating from the front lower right corner of the machine. It does this even when there is no print job in the queue.  I end up switching it off and resort to using a different lack and white printer. But really want and need to fix this for my only colour printer. There are no paper jams, no error is coming up, but it will not print. I'm at a loss as to how to fix this . Suggestions on where to start  would be most welcome

S