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The door locking doesn't mean that the oven sent into self clean, most of the time it locks because the heat causes the latch to failed. Try turning the breaker off to the unit for 60 seconds to see if it will reset. When you turn the circuit breaker on go inside and push on the door and hold it for a minute or two in case it's rubbing on the door latch not letting it release. If that doesn't work, then try to set the self clean, wait 60 seconds and cancel it to see if that will reset the door latch assembly. If nothing resets the door lock, then you just need to manually open the door and replace the door latch assembly. It's not easy to manually unlock the door. You'll need to use a coat hanger and pull the latch assembly from RIGHT to LEFT by slipping it down between the door and the oven frame at the top. Force the latch over to the left and open the door, then you can remove the panel in front of the door latch and replace the latch assembly. Now I do want to also add that you may need something stronger than a coat hanger to manually open the door. If you have an "L-shaped" tool like a cotter pin puller or allen wrench, that might give you the added strength to be able to pull on the latch and release it.
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