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The thermometer sensor and circuitry might be perfectly ok, still the 452 number might be a single digit gone bonkers in the panel, so that data being transmitted (maybe also recorded?) is ok while the readout is plain wrong. A human acting according data being shown there might react very differently from someone reading the temperatures log. Sometimes software problems can be awfully subtle.

Digital thermometers usually have triple digits to be able to display numbers in the low 100's. I could see one of them failing in a weird way and displaying 452.

I was as confused as the other commentators by this post until I realized that fixermark is thinking of analog thermometers with a physical dial, while we (and probably the author as well) are envisioning electronic thermometers with digital displays.

BBQ lid? Many have thermometers that go higher than this (say, 700F), and they're often outdoors.

How else would you know there is a wildfire outside?