According to the above schematic, no fan, turntable or heating would be a primary interlock problem. That is one of the door switches.
It could be the switch, a worn trip mechanism, or a bad/burned spade lug on the switch. You must open it up to fix it. Then eyeball it to determine if the spade lugs on all the switches are OK. Then verify that the door is activating ALL the switches. Then verify the the switches are all working using an ohmmeter.