From all the symptoms, I have an ESP probe in need of cleaning or replacement. Unfortunately, I do not know where to locate the probe. I have the manual through page 14, but the final 4 pages, including the cleaning and maintenance section is not part of the PDF. I've looked but so far I have not been able to locate it, and it is not in the same location as the Invincible "T" that I have been able to locate a complete manual for, so I am looking for help from some more experienced RS owners.