Capresso C-1000 coffee maker. Unit is overheating while trying to make coffee. No water flowing into the cup. 4 green lights come on. Inner screen is not blocked. Unit is 8 years old, but this is a new problem

Empty the water tank and Refill the water tank again. Filling the Water Tank • Open the water tank lid and remove the water tank. • Remove the Claris water cartridge packaging. • Rinse water tank well with clean, cold tap water then fill tank with water. • Make sure that the low water flotation device is in place. If not, readjust it on its place. • Replace water tank and make sure it clicks correctly into place. Then try again and see if the same problem is seen. -------------- If this is not helping then see the position of the selector knob,it should be set on coffee position.Reset it on coffee position.------If its set properly,then try reset method:-- 10.1 Resetting the Machine This procedure will take less than 30 seconds: A. Place a large cup underneath the frother. B. Turn the selector switch to the steam/hot water position and push the hot-water button. . The machine will pump water through the frother and stop automatically. C. Turn the selector switch back to the coffee position . You are now ready to make more coffee. Only the green READY light will be illuminated (not blinking). Caution: During the reset cycle, hot steam and hot water spit out of the frother and there is a risk of scalding. ---------- Also check the water tube from where water runs.if its blocked then due to no water or slow water passing the unit will overheat.----------Let the unit cool for few hours.Unplug it for 3 hours and reconnect.if its any circuit error then this resets the internal circuit board system.Unplugging the unit for 3 hours resets the internal circuit board. -------- Try out this possibilities.This should help.Thanks.Helpmech.

Sometimes hard water can build up and cause blockages.
Try mixing hot water and white vinegar (50/50 mix) and try running it through the machine. If this works, run it through a few more times than run cold water through a couple times to get rid of the vinegar.