Partner Academy · Deye
Fault
F21
DC Leakage Flow Fault
DC leakage current detected
Deye service: DC Leakage Flow Fault — external filter / PV earthing.
Field checks
- Check external filter modules and PV array earthing integrity.
FAQ
What does Deye F21 mean?
DC leakage current detected
What should I check for Deye F21?
- Check external filter modules and PV array earthing integrity.
When should I contact Inversol?
After noting the exact code, model, SN, and operating mode, complete the field checks. If the code returns after a clean power cycle, contact Inversol WhatsApp support with a photo of the display.
Partner lookup — not a substitute for the official Deye service manual or live measurements. Firmware maps can differ by model family.