Oven will go on but not heat up to set temp

Help! Set the oven to 350F. Oven beeps after +/- 5 mins but the oven temp is only about 200F. I checked the ignitor reading 1.2 amp. Change ignitor and temp sensor. The oven still does not get up to set temperature. New ignitor is reading 2.1amp. Would it be the control board?: How do I test the control board?