SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F48 error code
Grid frequency below the configured range.
Likely causes
- Generator or grid frequency low
- Wrong 50/60 Hz setting
- Noisy frequency measurement
Checks to run, in order
- 1Measure the grid frequency
- 2Check the 50/60 Hz setting
- 3Check the generator governor if a generator is used
Fixes
- Correct the frequency setting
- Stabilise the generator output
- Restart the inverter
When to escalate
If the frequency is within specification and F48 persists, the distributor should check the grid frequency detection.
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 F48 mean?
Grid frequency below the configured range.
How do I fix Deye F48?
Correct the frequency setting Stabilise the generator output Restart the inverter
When should I escalate Deye F48?
If the frequency is within specification and F48 persists, the distributor should check the grid frequency detection.
Can I reset Deye F48 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F48 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F48?
Deye F48 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.
Back to troubleshooting