I try to turn the oven on by setting the tempeture, but most of the time the oven keeps saying UNLOCK it blinks and beeps and won't let me set a temp.

If I do get to set the tempeture for it. As soon as the oven preheats the UNLOCK starts to blink again and the oven automatically shuts off, can anyone help me please?:confused:

Read you owners manual, sounds like you went through a clean cycle but didn't complete it.