SUN-5-12K-SG01HP3-EU-DM2 three-phase hybrid (warning codes)
Deye W04 error code
Meter communication failure.
Likely causes
- Meter RS485 wiring fault
- Wrong meter address or baud rate
- Meter not powered
- Wrong meter or CT type setting
Checks to run, in order
- 1Check the meter communication wiring
- 2Check the meter address and baud settings
- 3Check the meter power supply
Fixes
- Correct the wiring and termination
- Set the correct meter protocol
- Restart the inverter
When to escalate
If the meter communicates at register level but W04 persists, the distributor should check the inverter meter port.
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 W04 mean?
Meter communication failure.
How do I fix Deye W04?
Correct the wiring and termination Set the correct meter protocol Restart the inverter
When should I escalate Deye W04?
If the meter communicates at register level but W04 persists, the distributor should check the inverter meter port.
Can I reset Deye W04 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye W04 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye W04?
Deye W04 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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