SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table)
Deye F11 error code
AC main contactor failed to close or report correctly.
Likely causes
- Contactor coil or driver failure
- Pitted or stuck main contactor contacts
- Loose control wiring to the contactor
- Control-board fault
Checks to run, in order
- 1Listen for the contactor closing when the grid is applied
- 2Measure AC at the grid input and backup terminals
- 3Inspect the contactor control wiring
- 4Check the grid voltage and frequency
Fixes
- Restart and restore factory settings
- Correct any loose AC or control wiring
When to escalate
If the contactor does not operate with a healthy grid and DC supply, the contactor or control board must be replaced by the distributor.
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 F11 mean?
AC main contactor failed to close or report correctly.
How do I fix Deye F11?
Restart and restore factory settings Correct any loose AC or control wiring
When should I escalate Deye F11?
If the contactor does not operate with a healthy grid and DC supply, the contactor or control board must be replaced by the distributor.
Can I reset Deye F11 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F11 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F11?
Deye F11 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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