Common signs that a residential thermostat is failing include chronic temperature calibration drift (where room temperatures deviate significantly from display targets), unresponsive touchscreens or sticking mechanical buttons, short-cycling of the heating and cooling system, or completely blank screens due to internal power failures. If changing batteries or verifying low-voltage wiring fails to restore normal operation, the device requires replacement. Verification: Compare ambient room temperature using a separate thermometer against the thermostat display reading to check for sensor errors.
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