Oven poor heat

Range is approx 1 1/2 years old. Today oven part would not kick in. Range top/burners work fine. Broiler gets warm but not hot or red. The display will stay at 150 degrees and if you leave it on - slowly builds temp - 30 minutes you may get to 250-275. No matter what function you select - bake - convection - roast or broil - very limited heat. Also started noticing 3 horizontal lines to the left of the temp display going from bottom to top. Not sure I can recall ever seeing these before. Tried to get codes and not sure if I was doing it correctly but got a message saying "No EPP". The convection fan turns on and I have verified it shuts off when door is open and will turn on manually closing the door switch.

Thank you for any assistance

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via Oven poor heat
by Geekfather