2. Disconnect the charge controller from all power-sources
3. wait 3 minutes, and power up again.
4. Reconfigure the charger.
Please report this to your Victron dealer and ask them to escalate the matter to Victron; as this error should never happen.
Preferably include firmware version and any other specifics (VRM URL, VictronConnect screenshots or similar).
8.5.27. Error 121 - Tester fail
If the unit does not work and error 121 pops up as the active error the unit is faulty, contact your dealer for a replacement. If the
error is only present in the history data and the unit operates normally this error can be ignored safely. Explanation: when the unit
powers up for the very first time in the factory, it does not have calibration data and an error 121 is logged. Obviously this should
have been cleared, but in the beginning units left the factory with this message still in the history data.
Multi RS Solar
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Appendix