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3 quick beeps is actually an error code and it explains your light burning out as well. 3 beeps means that your door switch has failed. Sometimes you can push the door switch in with your thumb and then slide it off to cause the button on the switch to fling back out. Do this 2 or 3 times and sometimes that will reset the switch. If that doesn't work, the door switch just needs to be ordered and replaced to fix the issue.
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