The most frequently reported issues with Google Nest thermostats include power loss and battery drainage errors (often caused by the absence of a dedicated C-wire), Wi-Fi connectivity dropouts, intermittent heating or cooling cycling failures, and sensor calibration drift. Additionally, older units can experience mechanical base click failures or cracked display rings if handled roughly during manual temperature adjustments. Verification: Check the power voltage readings in your thermostat's technical settings menu to confirm whether your C-wire is supplying adequate continuous voltage.
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