The Ingersoll‑Rand 39814595 is a thermal mass controller designed for compressor air dryer systems, featuring an operator panel that interfaces with the compressor’s temperature and pressure sensors. Common failure points in this class include degraded thermistor or pressure transducer connections, power supply capacitor wear, and PCB solder joint fatigue due to vibration; firmware corruption can also cause loss of communication with the host system. First‑check diagnostics: verify 120 V input voltage and ensure the controller’s indicator LEDs are functioning, inspect all sensor wiring for continuity and proper termination, and review any error codes displayed on the panel or logged in the associated SCADA/PLC system.[oss-gpt-20b]