SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table)
Deye F39 error code
Internal AC overcurrent (single cycle).
Likely causes
- AC output short circuit
- Severe overload
- Output-stage hardware fault
Checks to run, in order
- 1Check the AC output for a short
- 2Check the load
- 3Restart the inverter
Fixes
- Clear the short and reduce the load
- Restart the inverter
When to escalate
If F39 returns with no output short or overload, the distributor should service the output stage.
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 F39 mean?
Internal AC overcurrent (single cycle).
How do I fix Deye F39?
Clear the short and reduce the load Restart the inverter
When should I escalate Deye F39?
If F39 returns with no output short or overload, the distributor should service the output stage.
Can I reset Deye F39 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F39 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F39?
Deye F39 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 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.
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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