SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F26 error code
DC bus voltage is unbalanced.
Likely causes
- Large single-phase load imbalance on a three-phase model
- DC leakage current
- Loose BUSN or driver-board supply cable
- Power-stage hardware fault
Checks to run, in order
- 1Wait briefly and check whether it clears
- 2Check three-phase load balance
- 3Check for DC leakage current
- 4Check the BUSN cable
Fixes
- Redistribute the single-phase loads
- Restart the system two to three times
When to escalate
If the loads are balanced and F26 persists, the distributor should inspect the bus and driver 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 F26 mean?
DC bus voltage is unbalanced.
How do I fix Deye F26?
Redistribute the single-phase loads Restart the system two to three times
When should I escalate Deye F26?
If the loads are balanced and F26 persists, the distributor should inspect the bus and driver board.
Can I reset Deye F26 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F26 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F26?
Deye F26 is documented for SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2. 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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