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Appendix A.2: Troubleshooting Controller Not Appearing on Victron Symptom Possible Cause Controller not in device list No CAN connection Wrong termination Cerbo port disabled Baud rate mismatch Firmware outdated Switch Not Controlling Channels Symptom Possible Cause CAN switch LED off No power on CAN bus Bluetooth switch not pairing Battery dead Cable fault Out of range Too many devices Switch operates wrong channel Auto-assignment conflict Matter Device Not Responding Symptom Possible Cause Device offline in app WiFi interruption
Solution Check cable, connectors Verify terminator at each end Enable VE.CAN in Cerbo settings Set Cerbo to 250 kbit/s Update Cerbo to v3.40+
Solution
Check 12V at switch connector Test continuity CAN-H, CAN-L, +12V, GND Replace CR2032 Move closer to controller Check limit (80 Bluetooth devices) Manually assign in app Check router, restart device Verify STAR Controller powered Re-commission to primary platform Solution
Thread network down Multi-admin conflict Cloud routing
Slow response
Check local execution enabled Network congestion Reduce Thread device count per border router
STAR-Tank Showing Incorrect Level Symptom Possible Cause Always reads full Calibration error Sensor too close to liquid Always reads empty Sensor not detecting surface
Solution
Re-run calibration procedure Mount higher on tank Check mounting—must be flush Adjust in app for metal vs. plastic Enable averaging filter in app Mount away from pumps, motors
Wrong tank material setting Tank sloshing Electrical interference
Erratic readings
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