Determining whether your central HVAC thermostat is failing involves observing specific electronic and operational warning signs. Major indicators include the thermostat screen going completely blank or unresponsive, the AC unit short-cycling (turning on and off rapidly without reaching the target temperature), the temperature displayed on the screen differing wildly from actual room temperature, and the system failing to respond when you change settings or adjust target temperatures. Verification: Check thermostat battery levels and test low-voltage wiring connections behind the wall plate.
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