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System worked fine for 18 months. Then start getting system disconnected from grid messages. Usually followed half an hour later by reconnect message and system working.
Recently, disconnect messages more frequent. Automatic reconnect stops happening, so a manual reset required. Not convenient.
Last couple of days, much more frequent.

Now stuck. Tried the reset several times. Inverter just not talking, doesn'thave any effect.
Firmware up to date.
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F26 error on single phase 8kW inverter
So that manuals say this is fault will come up when the inverter is in split-phase mode and the load of L1 and L2 are different.
So how can that happen on a single-phase inverter??
Had problem with high grid voltage. Caused system to shut down. After supllier fixed the high current all was fine. Inverter will switch off for high or low currents.