SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F01 error code
PV input polarity is reversed at one or both DC inputs.
Likely causes
- PV string positive and negative leads swapped at the DC switch or inverter
- MC4 extension leads rewired in reverse after array maintenance
- A parallel string combined with reversed polarity
Checks to run, in order
- 1Isolate the array and open the DC switch
- 2Measure string polarity with a DC meter at the inverter DC terminals
- 3Compare each string with the DC+ and DC- labels
- 4Inspect MC4 connectors and extension leads for swapped pins
Fixes
- Reconnect the string with correct polarity
- Replace connectors damaged by reverse current
- Close the DC switch and confirm the code clears
When to escalate
If polarity is correct at the terminals and F01 persists, the DC input protection is likely damaged; return the unit to the distributor.
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 F01 mean?
PV input polarity is reversed at one or both DC inputs.
How do I fix Deye F01?
Reconnect the string with correct polarity Replace connectors damaged by reverse current Close the DC switch and confirm the code clears
When should I escalate Deye F01?
If polarity is correct at the terminals and F01 persists, the DC input protection is likely damaged; return the unit to the distributor.
Can I reset Deye F01 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F01 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F01?
Deye F01 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 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.
- Deye F07DC-DC stage 1 could not raise the bus voltage from PV or battery.
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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