SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table)
Deye F25 error code
DC feedback fault in the bus-voltage sensing circuit.
Likely causes
- Bus-voltage feedback circuit fault
- Control-board fault
- Loose sense harness
Checks to run, in order
- 1Restart and read the fault log
- 2Check the DC bus connections
- 3Check the firmware version
Fixes
- Restart three times and restore factory settings
- Check and reseat the bus sense harness
When to escalate
If F25 returns after a restart and reset, the distributor should repair or replace the control board.
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 F25 mean?
DC feedback fault in the bus-voltage sensing circuit.
How do I fix Deye F25?
Restart three times and restore factory settings Check and reseat the bus sense harness
When should I escalate Deye F25?
If F25 returns after a restart and reset, the distributor should repair or replace the control board.
Can I reset Deye F25 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F25 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F25?
Deye F25 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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