SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table)
Deye F03 error code
Ground fault detected on the PV array (GFDI).
Likely causes
- PV conductor shorted to earth
- Water ingress in a DC connector or junction box
- Missing or incorrect neutral-earth bonding at the site
- Faulty GFDI sensing circuit
Checks to run, in order
- 1Megger PV positive and negative to earth
- 2Inspect array wiring, connectors and junction boxes
- 3Verify the N-PE bond used by the site earthing system
- 4Check for leakage current on the PV cables
Fixes
- Clear the DC-to-earth fault before reconnecting the array
- Dry and reseal wet parts
- Correct the N-PE bonding to the local standard
- Restart and confirm the code clears
When to escalate
If insulation and earthing test normal but F03 returns, have the distributor check the GFDI circuit inside the inverter.
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 F03 mean?
Ground fault detected on the PV array (GFDI).
How do I fix Deye F03?
Clear the DC-to-earth fault before reconnecting the array Dry and reseal wet parts Correct the N-PE bonding to the local standard Restart and confirm the code clears
When should I escalate Deye F03?
If insulation and earthing test normal but F03 returns, have the distributor check the GFDI circuit inside the inverter.
Can I reset Deye F03 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F03 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F03?
Deye F03 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 F04GFDI ground-failure alarm: the PV array or inverter is not properly earthed.
- 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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