It reset when I turned the printer on again, the overflow tank cost around 15, which is not expensive, we leave the printer turned on 24/7 with no problems.

Have an Epson 4750, ordered 2 ink overflow tanks for it, printer gave a message one day that the tank needed to be changed. Glad I had spare tanks, it took less than 10 minutes to access the filled tank and replace with a new tank. Wasn’t messy at all, this is one of the best and most economical printers that I’ve owned. Did have problem with purple fringing when printing black and white, found that if you unplug the printer for 24 hours then plug it back in the purple went away, and the printing seems to have improved.