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There is little cause for concern about excess microwaves leaking from ovens unless the door hinges, latch, or seals are damaged. The FDA recommends looking at your oven carefully, and not using an oven if the door doesn’t close firmly or is bent, warped, or otherwise damaged.
The FDA also monitors appliances for radiation safety issues and has received reports of microwave ovens that appear to stay on – and operate – while the door is open. When operating as intended, microwave ovens have safety features to prevent them from continuing to generate microwaves if the door is open. However, if an oven does continue to operate with the door open, consumers cannot be 100 percent sure that microwave radiation is not being emitted. Thus, if this occurs, the FDA recommends immediately discontinuing use of the oven.