You only need to replace your Nest thermostat if it experiences uncorrectable hardware failures, such as a fried Wi-Fi radio module, permanent internal battery charging failure despite correct wiring, severe temperature sensor calibration drift exceeding several degrees, or a permanently frozen display screen. If the device powers on correctly, connects to Wi-Fi, and controls your heating and cooling equipment accurately, replacement is unnecessary. Verification: Check technical voltage metrics in the thermostat settings menu to verify if internal power delivery and sensor functions are operating normally.
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