Sounds like the drain pump switch is stuck in the on position, or the main power switch is not closing. Or, and the most likely, the stand pipe is not in place or broken. You will need someone with a good knowledge of electricity and a good Multi meter. All things a food service company has.. I will enclose a wiring diagram for you and a manual. Check page 28 on for possibilities
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http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/JTD-F-14_iom.pdf
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wiring diagram, Jet tech F18DP.
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Have you checked your stand pipe for being in place? This machine does run the pump until it satisfies the pressure stat on fill. Also check the incoming water filter for obstruction. The machine will not do anything till the pressurestat is showing it full.