Determining whether a Honeywell thermostat is failing involves checking for chronic hardware symptoms such as uncalibrated temperature readings that drift significantly from actual room conditions, unresponsive touchscreens or sticking mechanical buttons, failure to trigger heating or cooling cycles despite correct target setpoints, or blank display screens caused by internal power failures. If replacing backup batteries or checking low-voltage wiring fails to restore normal operation, the unit has reached the end of its lifespan. Verification: Compare ambient room temperature using a separate thermometer against the thermostat display reading to check for sensor calibration drift.
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