Your thermostat typically needs to be replaced if it exhibits chronic mechanical or electronic failures, such as failing to turn the heating or cooling system on when indoor temperatures drift far past target setpoints, a completely blank or frozen display screen, uncalibrated temperature readings that cannot be corrected, or internal relay switches that click continuously without triggering HVAC cycles. Verification: Test system response across heating and cooling modes and check low-voltage power metrics in the device settings menu.
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