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Deye · PV inverters · Deye SUN-SG04LP3-EU (three-phase hybrid inverter, 5–12 kW)

F48AC_UnderFreq_Fault

Name in the manufacturer's documentation (fault list): AC_UnderFreq_Fault[1]

In plain words (editorial)

The grid frequency is too low. The manual says to check that the grid value is within the specification and that the AC cables are firmly and correctly connected.

When to call a service technician: If it does not return to normal, contact your installer or Deye support.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Deye Three Phase Hybrid Inverter SUN-5-12KWSG04LP3 Fault List , p. 5 manufacturer document – copy from a distributor quote verified F48 AC_UnderFreq_Fault
  2. [2] Deye Three Phase Hybrid Inverter SUN-5-12KWSG04LP3 Fault List , p. 5 manufacturer document – copy from a distributor quote verified Check the frequency is in the range of specification or not
  3. [3] Deye Three Phase Hybrid Inverter SUN-5-12KWSG04LP3 Fault List , p. 5 manufacturer document – copy from a distributor quote verified Check whether AC cables are firmly and correctly connected
  4. [4] Deye Three Phase Hybrid Inverter SUN-5-12KWSG04LP3 Fault List , p. 5 manufacturer document – copy from a distributor quote verified Seek help from us, if can not go back to normal state