SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (warning codes)
Deye W02 error code
Internal fan warning: fan operation is abnormal.
Likely causes
- Fan obstructed
- Fan bearing or cable fault
- Dust build-up
Checks to run, in order
- 1Observe the internal fan at start-up
- 2Check the fan connector
- 3Clean the fan and heatsink
Fixes
- Clean or replace the fan
- Reseat the fan connector
When to escalate
If the warning persists after the fan is replaced, the distributor should check the fan drive circuit.
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 W02 mean?
Internal fan warning: fan operation is abnormal.
How do I fix Deye W02?
Clean or replace the fan Reseat the fan connector
When should I escalate Deye W02?
If the warning persists after the fan is replaced, the distributor should check the fan drive circuit.
Can I reset Deye W02 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye W02 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye W02?
Deye W02 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.
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