SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table)
Deye F04 error code
GFDI ground-failure alarm: the PV array or inverter is not properly earthed.
Likely causes
- PV mounting frame not bonded to earth
- Inverter PE conductor missing or loose
- Earth electrode or earth pit in poor condition
- Loose GFDI terminal wiring
Checks to run, in order
- 1Check continuity from the PV frame to the earth bar
- 2Check the inverter PE terminal torque and continuity
- 3Measure the earth resistance of the electrode
- 4Inspect the GFDI connection on the control board
Fixes
- Bond the PV frame and re-torque the PE terminals
- Repair or add an earth electrode to meet the local standard
- Restart and confirm the alarm clears
When to escalate
If earthing is verified good and F04 persists, ask the distributor to inspect the GFDI sensing hardware.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does Deye F04 mean?
GFDI ground-failure alarm: the PV array or inverter is not properly earthed.
How do I fix Deye F04?
Bond the PV frame and re-torque the PE terminals Repair or add an earth electrode to meet the local standard Restart and confirm the alarm clears
When should I escalate Deye F04?
If earthing is verified good and F04 persists, ask the distributor to inspect the GFDI sensing hardware.
Can I reset Deye F04 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F04 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F04?
Deye F04 is documented for SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table). Confirm the code on your own unit's display or manual before ordering parts.
More Deye error codes
- Deye F01PV input polarity is reversed at one or both DC inputs.
- Deye F02PV insulation resistance to earth is below the safety limit.
- Deye F03Ground fault detected on the PV array (GFDI).
- Deye F05Control-board EEPROM read failure.
- Deye F06Control-board EEPROM write failure.
- Deye F07DC-DC stage 1 could not raise the bus voltage from PV or battery.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
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