In April I started to notice that my fridge and freezer temperature was not being maintained. Ice cream was soft, and milk was spoiling faster than usual. I got some govee temperature sensors and installed them in both because I thought I might be imagining things or going crazy. Sometimes it was cold, sometimes it wasn't. Were the kids holding the doors open too long? Was it getting worse over time? Ultimately I figured out it was a slowly failing compressor and/or fan that was causing the issues. The fridge is 10 years old, and is an LG which is known to have compressor issues (Linear). It was already replaced once, about 5 years ago so wasn't covered anymore.
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I got a new fridge at the end of May which is when you see the average temperature change, and the swing of temperature change drastically reduced.
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These sensors helped me confirm my assumptions, so I thought I'd share!
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Source: my fridge with govee temperature sensors and govee app #education source