Victron Error 25 fault: Incompatible firmware or configuration
Call a qualified installer
Urgency: medium
What it means
The units in the system have firmware or settings that don't match. An installer needs to update or reconfigure them.
Likely causes
- Mixed firmware versions
- Configuration mismatch
Don't try to fix this yourself
When to call a pro
Call a qualified installer now. Switch off heavy loads and don't try to repair anything yourself.
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.