You can reset your Epson PX-503A printer waste ink pad error messages with WICReset tool. Wicreset help you reset Epson PX-503A's waste ink counter error messages.
Epson PX-503A printer Waste ink error messages?
A printer error has occured
Epson PX-503A printer ink pads are at the end of their service life. Please contact Epson support Waste ink pad in the printer is saturated
Epson PX-503A waste ink counter overflow messages