SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F55 error code
On SG04LP3/SG05LP1, DC bus voltage too high; on SG01HP3-DM2 firmware F55 reports battery 1 terminal voltage too high.
Likely causes
- Battery overvoltage
- PV input overvoltage
- Wrong battery or charge settings
- Voltage-sensing fault
Checks to run, in order
- 1Check the battery 1 voltage
- 2Check the PV input voltage
- 3Check the charge settings
- 4Restart and read the fault log
Fixes
- Reduce the charge voltage
- Correct the PV configuration
- Restart the inverter
When to escalate
If the battery and PV voltages are normal and F55 persists, the distributor should check the voltage sensing.
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 F55 mean?
On SG04LP3/SG05LP1, DC bus voltage too high; on SG01HP3-DM2 firmware F55 reports battery 1 terminal voltage too high.
How do I fix Deye F55?
Reduce the charge voltage Correct the PV configuration Restart the inverter
When should I escalate Deye F55?
If the battery and PV voltages are normal and F55 persists, the distributor should check the voltage sensing.
Can I reset Deye F55 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F55 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F55?
Deye F55 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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