SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F20 error code
DC overcurrent detected by hardware; common when starting a heavy off-grid load.
Likely causes
- Heavy off-grid load at start-up
- Battery or PV connection problem
- DC current sensor fault
- Firmware/hardware mismatch
Checks to run, in order
- 1Check the PV module and battery connections
- 2Reduce the connected load and retest
- 3Measure DC current with a clamp meter
- 4Check the firmware version against the hardware
Fixes
- Reduce the load power
- Switch DC and AC off for one minute, then restart
- Reconnect the battery and PV terminals
When to escalate
If F20 appears with a light load and correct DC wiring, the DC current sensor or power 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 F20 mean?
DC overcurrent detected by hardware; common when starting a heavy off-grid load.
How do I fix Deye F20?
Reduce the load power Switch DC and AC off for one minute, then restart Reconnect the battery and PV terminals
When should I escalate Deye F20?
If F20 appears with a light load and correct DC wiring, the DC current sensor or power stage needs distributor service.
Can I reset Deye F20 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F20 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F20?
Deye F20 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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