SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F34 error code
AC overload on the backup output.
Likely causes
- Backup load above the inverter rating
- Simultaneous high loads
- Motor starting surge
Checks to run, in order
- 1Check the backup load connection and total wattage
- 2Check the backup output for a short
- 3Check the load start-up sequence
Fixes
- Reduce the backup load
- Stagger the load starts
- Restart the inverter
When to escalate
If the backup load is within rating and F34 recurs, the distributor should check 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 F34 mean?
AC overload on the backup output.
How do I fix Deye F34?
Reduce the backup load Stagger the load starts Restart the inverter
When should I escalate Deye F34?
If the backup load is within rating and F34 recurs, the distributor should check the output stage.
Can I reset Deye F34 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F34 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F34?
Deye F34 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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