SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F64 error code
Heatsink temperature too high.
Likely causes
- High ambient temperature
- Blocked or dirty heatsink
- Fan failure
- Overload or insufficient clearance
Checks to run, in order
- 1Check the ambient temperature
- 2Check the fans and heatsink cleanliness
- 3Check the clearance around the inverter
- 4Check the load
Fixes
- Clean the heatsink and restore airflow
- Reduce the load
- Switch off for ten minutes and restart
When to escalate
If the fans and airflow are good and F64 returns, the distributor should check the thermal sensor and fan board.
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 F64 mean?
Heatsink temperature too high.
How do I fix Deye F64?
Clean the heatsink and restore airflow Reduce the load Switch off for ten minutes and restart
When should I escalate Deye F64?
If the fans and airflow are good and F64 returns, the distributor should check the thermal sensor and fan board.
Can I reset Deye F64 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F64 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F64?
Deye F64 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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