SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table)
Deye F02 error code
PV insulation resistance to earth is below the safety limit.
Likely causes
- Damaged DC cable or connector insulation
- Water ingress in a DC connector or junction box
- Inverter PE conductor not bonded to the installation earth
- Grounded or damaged PV module frame
Checks to run, in order
- 1Disconnect the PV array and megger each string to earth
- 2Inspect DC cables and connectors for damage or moisture
- 3Confirm the inverter PE terminal is bonded to the earth bar
- 4Check the PV frame for an unintended earth path
Fixes
- Repair or replace damaged DC cable and connectors
- Dry and reseal wet connectors and junction boxes
- Bond the PV frame and inverter PE correctly
- Restart once insulation is above the manufacturer's minimum
When to escalate
If every string reads a healthy insulation resistance and F02 remains, the distributor should test the inverter's insulation detection circuit.
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 F02 mean?
PV insulation resistance to earth is below the safety limit.
How do I fix Deye F02?
Repair or replace damaged DC cable and connectors Dry and reseal wet connectors and junction boxes Bond the PV frame and inverter PE correctly Restart once insulation is above the manufacturer's minimum
When should I escalate Deye F02?
If every string reads a healthy insulation resistance and F02 remains, the distributor should test the inverter's insulation detection circuit.
Can I reset Deye F02 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F02 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F02?
Deye F02 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 F03Ground fault detected on the PV array (GFDI).
- 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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