My oven shows a code F0. In the past would only show after oven turned off. Yesterday showed code and stopped cooking 1.5 hours into a pork roast. Is it the control module or the touch pad. Sometimes the unit will accept commands after setting for an hour, sometimes only after circuit breaker cycled off then on. Left breaker off for 11 hours overnite, problem continues to happen. I checked the ribbon connector but it shows no insulation problems. Full model number is JK915S0F1SS, any idea when it was built?

usually 40 minutes per 500 grams at 180 degrees C
so 1 and a half hours plus preheat the oven .
And it is thawed not frozen

don't just take my word for it read it on link below
http://www.pork.com.au/home-page-consumer/recipes/cooking-instructions.aspx

Yes I would as the meat is very dry.

There are hundreds of internet recipes for pork shoulder (or porkbutt--which is just a couple pieces of pork shoulder that are butted together and tied with string).

roast pork shoulder Google Search

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My wife says to baste with butter, salt and pepper with a pinch of rosemary. Cook at 225 F for about 30 to 35 minutes. Pork is as its best at mid rare and can serve with a side mint jelly. Enjoy.

Hello,4 Digit Failure Code F0 - E0 Analog to Digital Failure Disconnect for 30 seconds - if display re-appears - replace control F1 - E1 Safety flip flop Replace Electronic Range Control/Clock(ERC) F2 - E0 Shorted keypad Replace Electronic Range Control/Clock(ERC) F3 - E0 Oven temperature sensor or oven temperature sensor fuse opened Replace oven temperature sensor or fuse F3 - E1 Oven temperature sensor shorted Replace oven temperature sensor F3 - E2 Oven too hot Replace oven temperature sensor F3 - E3 Clean temp too hot Replace oven temperature sensor F5 - E0 F5 - E1 and E2 Check door/latch switch Replace component 2 Digit Failure Code F0 or F1 or F5 Failed transistor Replace Electronic Range Control/Clock(ERC) F2 - E0 Oven temp too high 1. Test operation of door lock on self-clean models
2. Test relay contact operation
3. High resistance in oven temperature sensor F3

Thanks

If your appliance is newer than 1996 F0 error code is a stuck key pad .
To verify turn off power and access the control panel and remove the ribbon connector that goes from key pad to control board .
Now restore power.
If the F0 code goes away you'll have to replace the key pad .
If it stays it means the control board is bad.
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Check for a bad fan motor or a jammed blade.