GoodWe · PV inverters · GoodWe ET G2 6–15 kW (three-phase hybrid inverter)
F21Internal Comm Loss
Name in the manufacturer's documentation (user manual): Internal Comm Loss
[1]
In plain words (editorial)
Internal communication loss between the inverter's processors (the manual names communication timeouts, a chip not powered on or a program version error). The manual's procedure: switch off the AC output switch and the DC input switch, and switch them back on 5 minutes later.
When to call a service technician: If the fault persists, contact your dealer or GoodWe after-sales.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
- SlaveDSP1communic ation timeout- MasterDSP, SlaveDSP2communic ation timeout- MasterDSP, SlaveDSP2communic ation timeout- SlaveDSP1, MasterDSPcommuni cation timeout- SlaveDSP1, MasterDSPcommuni cation timeout- SlaveDSP2or SlaveDSP1communic ation timeout- SlaveDSP2：[2]
- The chip is not powered on[3]
- Chip program version error[4]
- MasterDSPcanmodul e error, SlaveDSP1canmodul e error or SlaveDSP2canmodul e error:[5]
Steps given by the manufacturer (source text)
- Disconnect the AC output side switch and DC input side switch,5 minutes later, close the AC output side switch and DC input side switch. If the fault persists, please contact your dealer or after-sales service center.[6]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
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] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 199 official manufacturer document quote verified
- [2] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 199 official manufacturer document quote verified
SlaveDSP1communic ation timeout- MasterDSP, SlaveDSP2communic ation timeout- MasterDSP, SlaveDSP2communic ation timeout- SlaveDSP1, MasterDSPcommuni cation timeout- SlaveDSP1, MasterDSPcommuni cation timeout- SlaveDSP2or…
- [3] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 199 official manufacturer document quote verified
The chip is not powered on
- [4] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 199 official manufacturer document quote verified
Chip program version error
- [5] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 200 official manufacturer document quote verified
MasterDSPcanmodul e error, SlaveDSP1canmodul e error or SlaveDSP2canmodul e error
- [6] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 199 official manufacturer document quote verified
Disconnect the AC output side switch and DC input side switch,5 minutes later, close the AC output side switch and DC input side switch. If the fault persists, please contact your dealer or after-sales service center