The Granville‑Phillips 354006‑YM‑T is a Micro‑Ion vacuum gauge module that interfaces via RS‑485 or DeviceNet to provide digital readouts of pressure in high‑vacuum systems. Common failure points for this class include degraded power supply rails, broken communication lines (e.g., twisted pair shorts or opens), and firmware corruption leading to “fault” status codes on the display. Begin troubleshooting by verifying that the module receives its rated 24 VDC input and that all ground connections are secure; then inspect the RS‑485/DeviceNet cable for continuity, proper termination, and correct biasing; finally review any error or status registers via a serial terminal to identify diagnostic flags before proceeding with component replacement.[oss-gpt-20b]