SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F08 error code
DC-DC stage 2 could not raise the bus voltage from PV or battery.
Likely causes
- Second PV input or battery feed below the start-up threshold
- Open DC switch, breaker or fuse on the second input
- Battery BMS contactor not closed
- Fault in the second DC-DC stage
Checks to run, in order
- 1Confirm the second DC input switch and breaker are closed
- 2Measure PV and battery voltage at the second input
- 3Check the DC fuses on that input
- 4Check BMS communication and battery state
Fixes
- Close the switch or breaker and reset the fuse
- Charge the battery or wait for sufficient PV voltage
- Restart the inverter
When to escalate
If the second input has correct voltage and F08 persists, the DC-DC stage needs distributor service.
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 F08 mean?
DC-DC stage 2 could not raise the bus voltage from PV or battery.
How do I fix Deye F08?
Close the switch or breaker and reset the fuse Charge the battery or wait for sufficient PV voltage Restart the inverter
When should I escalate Deye F08?
If the second input has correct voltage and F08 persists, the DC-DC stage needs distributor service.
Can I reset Deye F08 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F08 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F08?
Deye F08 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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