SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table)
Deye F45 error code
Grid voltage above the configured high-voltage limit.
Likely causes
- High grid voltage
- PV backfeed raising the point-of-connection voltage
- Wrong grid standard selected
- High transformer tap setting
Checks to run, in order
- 1Measure the grid voltage at the inverter AC input
- 2Check the grid standard setting
- 3Check the AC cable and connection
Fixes
- Wait for the grid voltage to normalise
- Correct the grid standard within the allowed limits
- Reduce export if the site is permitted to
When to escalate
If the grid voltage is chronically high, escalate to the utility and ask the distributor to confirm the grid settings.
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 F45 mean?
Grid voltage above the configured high-voltage limit.
How do I fix Deye F45?
Wait for the grid voltage to normalise Correct the grid standard within the allowed limits Reduce export if the site is permitted to
When should I escalate Deye F45?
If the grid voltage is chronically high, escalate to the utility and ask the distributor to confirm the grid settings.
Can I reset Deye F45 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F45 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F45?
Deye F45 is documented for SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (F-series table). 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.
Back to troubleshooting