Victron Error 4 fault: No other devices detected
Keep an eye on it
Urgency: low
What it means
The master unit can't find the other units. This is normal for a short time during a restart.
Likely causes
- System still starting up
- Communication problem if it stays
What you can safely check
- Wait a few minutes – this message often clears by itself.
- If it keeps coming back, stop and call a qualified installer.
When to call a pro
If it doesn't clear on its own, happens often, or comes with burning smells, heat or noise, call a qualified installer.
Solar systems carry dangerous voltages. Only do the safe checks listed. If unsure, call a pro.
Source: Victron Energy – VE.Bus Error Codes (paraphrased)
Victron advises that this work be done by trained professionals.