Sounds like the valve itself is stuck open. Shut off the water to the dishmachine, remove the solenoid coil, get a pipe wrench or large crescent wrench and open the top of the rinse valve. Either get some muriatic acid or some strong lime away and clean the internal valve. Make sure to put the parts back in the correct way. The top of the valve has a piston and a spring. DO not lose either of them. The bottom of the valve has a diaphram and a valve seat. remove both of these clean them so that they move freely. Install all the parts exactly like you found them. Tighten down the valve, put the coil back on and turn on the water
Contact the manufacturer.
FIXYA uses unpaid volunteers throughtout the world who try to answer questions for free. FIXYA volunteers do not work for manufacturers or sell washing machines or other appliances.
Phone: 888.800.5672
Mailing Address:
6209 N U.S. Hwy 25E
Gray, KY 40734
Online form to send questions:
https://www.jacksonwws.com/contact/Contact Jackson WWS
You have neglected to include the model number which you must have if you have the manual. Jackson produced a number of models. That said, here is a site that may help you because it shows where parts go in a schematic:
Wash Rinse AssemblyContact Jackson WWS