The Hill‑Rom MedPlus Dew Point/CO Monitor is a dual‑parameter safety device used in industrial and healthcare environments to continuously measure ambient dew point and carbon monoxide levels, triggering alarms when thresholds are exceeded. Common failure modes for this class of units include power supply degradation (often due to capacitor aging), display or controller board faults leading to blank screens or incorrect readings, and sensor drift or contamination causing erroneous dew‑point or CO values. First‑check diagnostics should verify the 24 V DC input voltage and monitor output currents; inspect the main PCB for burnt components or loose solder joints; review any logged error codes on the display or via serial interface; and perform a functional test of the CO sensor by exposing it to known concentrations if available.[oss-gpt-20b]