Static electricity kills MFC electronics. Use a dedicated grounding wire between the grounding lug on the MFC Top and the system earth busbar. Resistance must be < 1 Ohm.
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| Symptom | Likely Cause | Fix via MFC Top Interface | | :--- | :--- | :--- | | | Loss of 24VDC or blown fuse | Check voltage at the V+ terminal. Replace internal 1A slow-blow fuse. | | "Sensor Error" flashing | Broken thermal element in base | Disconnect Top from Base. Inspect pogo pins for bending. | | Flow reading drifts | Temperature fluctuation | Perform a "Hot Zero" after 20 minutes of warm-up. | | No Modbus response | Incorrect slave ID | Check DIP switches inside MFC Top battery compartment. | | Valve stuck open | Debris in the actuator | Cycle the "Valve Test" mode from 0-100% three times rapidly to dislodge debris. | Static electricity kills MFC electronics