Looking for someone to answer my question, can I put sheet pans through my Jackson Tempstar dishmachine

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

Is it possible someone has accidentally leant on the door? I would take side panels off and check if hinges are bent

Go to this site: http://www.jacksonmsc.com/
enter the product and look for the manual

typically 6 gauge is what is needed for that voltage

1)Temperature is more than 90-100degree means the steam will comes from the rinse arm automatically (as u indicated thermostat chances is there)
2)check the heater contactor is getting switched off interminently(if it is not getting off problem on thermostat)

look for the fot surface ignitor . it has probably failed and will require replacement. it will be located in or about the burners ( in center ) . or to left of center .. do not touch the ignitor when installing ..or bang it on anything . they break easy. mm

Look for the BTU rating. 12,000 BTU is a one ton unit.

same as anthing being left on

You can download the manual you need by going to this link:
http://www.jacksonmsc.com/?xhtml=xhtml/jac/us/en/general/productdownloads_service.html&xsl=productdownloads.xsl
Hope this helps,
Kermit