Growatt · PV inverters · Growatt MOD TL3-X (three-phase grid inverter, 3–15 kW)
Error 420GFCI Module damage
Name in the manufacturer's documentation (user manual): GFCI Module damage
[1]
In plain words (editorial)
The GFCI (leakage current) module is damaged. The manual says to check the leakage current module after shutdown.
When to call a service technician: If the message still exists, contact your installer or Growatt.
✎ 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] Installation & Operation Manual – MOD 3–15KTL3-X (GR-UM-212-A-05, AU ed. 2021-12) (GR-UM-212-A-05) , p. 28 official manufacturer document quote verified
Error 420 GFCI Module damage
- [2] Installation & Operation Manual – MOD 3–15KTL3-X (GR-UM-212-A-05, AU ed. 2021-12) (GR-UM-212-A-05) , p. 28 official manufacturer document quote verified
after shutdown,check the leakage current module
- [3] Installation & Operation Manual – MOD 3–15KTL3-X (GR-UM-212-A-05, AU ed. 2021-12) (GR-UM-212-A-05) , p. 28 official manufacturer document quote verified
if the error message still exists, contact manufacturer