SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (warning codes)
Deye W10 error code
Volt-watt activation: grid voltage is high and the inverter is limiting its output.
Likely causes
- Grid voltage high at the connection point
- AC cable too thin, causing voltage rise
- Export limit or volt-watt setting active
Checks to run, in order
- 1Measure the grid-port voltage
- 2Check the AC cable size
- 3Check the volt-watt and export settings
Fixes
- Correct the AC cable size
- Adjust the settings within the grid standard
- Wait for the voltage to normalise
When to escalate
If the voltage is normal at the terminals and W10 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 W10 mean?
Volt-watt activation: grid voltage is high and the inverter is limiting its output.
How do I fix Deye W10?
Correct the AC cable size Adjust the settings within the grid standard Wait for the voltage to normalise
When should I escalate Deye W10?
If the voltage is normal at the terminals and W10 persists, the distributor should check the voltage sensing.
Can I reset Deye W10 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye W10 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye W10?
Deye W10 is documented for SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (warning codes). 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