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What is F13 on a Sunsynk inverter?

Short answer

F13 means the working mode changed: the grid type or frequency changed, the battery was set to 'No battery', or older firmware logged a work-mode change. Sunsynk says it normally clears itself; if not, the documented fix is DC and AC switches off for one minute, then on (Sunsynk fault codes document, March 2024, checked 24 September 2026).

Last checked 24 September 2026 · 1 source

In more detail

  • Ask whether anyone changed settings in the app.
  • Only follow the switch-off sequence if your installer showed you how.
  • Deye-branded inverters use the same F13 meaning.

The facts, dated

  1. 01
    Sunsynk: 'Generally, this fault will automatically disappear'.

    manufacturer · UK · checked 24 September 2026 · hg-technical.herholdts.co.za

Sources

Last checked: 24 September 2026