The control panel display light is completely dark but the oven still seems to function ok. Jenn Air Model WW30430P double wall oven.

F7 - Function Key Shorted or Stuck - Replace touch pad, or touch pad and control board (clock) if one assembly.

F3
or
F4
Shorted or open oven temperature sensor
(RTD) Check sensor harness and harness connection
between oven sensor and oven control. Replace oven temperature sensor (RTD) if
wiring is ok.

Hey - the ribbon link from membrane to control is a tricky plug to get in right- double check this connection and let me know if it helps- Thanks- Ed

need to replace item #2

There are several models of Jenn-Air ovens that had issues with the door closing. The only solution is to replace the door hinges (unless the doors themselves are bad, you can see this if you open the door, the porcelain on the door will be bulged and cracked right where the hinge joins the door). If the doors are bad, the hinges and the interior door panels need to be replaced. Hope this helps!

It is highly likely that your heating element is open so I would ( with power removed) verify the integrity of the element by detaching it and making sure it is not elecltrically OPEN, It is nothing more than a big power resistor that when current is flowing,..gets hot but if it becomes open.. you will not have any curent flow thru it ( or heat generated from it). That would be the first place I would look.. It could also be the control that feeds it..
A few ideas to check..
Regards,
Rick

I have the exact same problem with an F5 fault code. I also have a new clock assembly. RepairClinic.com said "Jenn Air fault code F5 = Hardware and watchdog circuits disagree / Replace clock assembly (also called the ERC)

Jenn Air Fault code for newer models F5 = Power to element relays disabled in cook mode
1. Intermittent oven temperature sensor or wire harness or,
2. Intermittent contact on power relay board"
This doesn't help since it is too technical. What should I do next?

this can be the light unit or the power unit supplying the voltage to the light unit. both cost about$150 each. I need a wiring diagram or know the voltage that comes out of the epower supply

that board supplies power to the light unit and it is very easy to replace if that is what is wrong. it can also be the led display unit also. cost about $150 each i think.

I'm afraid you are going to need a new display board. Not very hard to change but a pricey item. Have seen this problem a few times. Good Luck!