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--- mppt-error-codes [2025-03-17 14:35] – rvanzundert
+++ mppt-error-codes [2026-02-10 11:21] (current) – Add Err 77 (Settings sync disabled) rvanzundert
@@ Line 178: / Line 178: @@
 PV panel isolation resistance too low.
 Check the PV array cabling and panel isolation, the inverter restarts automatically once the issue is resolved.
+Consider disconnecting the PV array using the PV switch to resume AC operation.
 ==== Err 42 - Inverter shutdown (PV isolation) ====
 The ground leakage current in the PV array exceeds the allowed 30mA limit.
 Check the PV array cabling and panel isolation.
-Check the installation and restart the unit using the power-switch.
+Consider disconnecting the PV array using the PV switch to resume AC operation.
 ==== Err 43 - Inverter shutdown (Ground Fault) ====
@@ Line 313: / Line 314: @@
 The inverters remain operational, they won't connect to the grid. Once the issue is resolved the units will connect.
-==== Err 74 - Phase overload ====
+==== Err 74 - Too many units in parallel ====
 Applies to Inverter RS and Multi RS models. Firmware versions 1.12 and higher.
 The number of inverters in parallel doesn't match with the transfer capabilities of the ac input relay of the Multi RS or Transfer switch.
-Firmware v1.12 does not support parallel units and a grid connection, so any combination of a Multi RS with a grid connection with more than one unit in parallel will trigger this error code on the Multi RS. The Multi RS only supports 3 units in 3-phase configuration at the moment.
+The firmware does not support parallel units and a grid connection, so any combination of a Multi RS with a grid connection with more than one unit in parallel will trigger this error code on the Multi RS. The Multi RS only supports 3 units in 3-phase configuration at the moment.
 The inverters remain operational, they won't connect to the grid. Once the issue is resolved the units will connect.
@@ Line 328: / Line 329: @@
 The inverters remain operational, they won't connect to the grid.
-==== Err 76 - Insufficient inverters ====
+==== Err 76 - Network incomplete ====
 Applies to Inverter RS and Multi RS models.
@@ Line 335: / Line 336: @@
 Related configuration settings in VictronConnect are "Prevent CAN network islanding" + "Number of inverters in the system" and "Continue with missing phase" in the System section.
+==== Err 77 - Settings sync disabled ====
+Applies to Inverter RS and Multi RS models. Firmware v1.29 and higher.
+This is a warning that indicates a mixed configuration in a networked setup where system settings synchronisation is enabled on some devices but not on all units. The units that have the settings synchronisation disabled show this warning. The units remain operational, to clear the warning either enable or disable system settings synchronisation on all units.
 ==== Err 80, Err 81, Err 82, Err 83, Err 84, Err 85, Err 86 and Err 87 - PV Input shutdown ====