SPF 3000TL LVM-ES / SPF 3500–5000 ES Lite off-grid (fault codes 01–81)
Growatt 03 error code
Battery is over-charged / battery voltage is too high (F03 on the ES Lite).
Likely causes
- Charge voltage set too high for the battery type
- Wrong battery type selected in program 05
- Battery capacity too small for the charge current
- BMS not limiting charge because communication is absent
Checks to run, in order
- 1Measure battery voltage at the DC input
- 2Check the battery SOC in the LCD when a lithium battery is used
- 3Check whether battery specification and quantity meet the requirements
- 4Check the selected battery type and charge voltage settings
Fixes
- Adjust the charging current to less than 0.2C
- Correct the battery type/charge voltage settings
- Restart the unit and confirm battery voltage settles
When to escalate
If battery voltage is correct for the bank and fault 03 returns, return the unit to a Growatt repair centre.
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 Growatt 03 mean?
Battery is over-charged / battery voltage is too high (F03 on the ES Lite).
How do I fix Growatt 03?
Adjust the charging current to less than 0.2C Correct the battery type/charge voltage settings Restart the unit and confirm battery voltage settles
When should I escalate Growatt 03?
If battery voltage is correct for the bank and fault 03 returns, return the unit to a Growatt repair centre.
Can I reset Growatt 03 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt 03 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Growatt 03?
Growatt 03 is documented for SPF 3000TL LVM-ES / SPF 3500–5000 ES Lite off-grid (fault codes 01–81). Confirm the code on your own unit's display or manual before ordering parts.
More Growatt error codes
- Growatt 01Fan is locked (displayed as F01 on the SPF ES Lite).
- Growatt 02Internal component temperature is over 100 °C (F02 on the ES Lite).
- Growatt 04Battery voltage low.
- Growatt 05Output is short-circuited (F05 on the ES Lite).
- Growatt 06Output voltage is too high. The manual groups 06/58 as 'output abnormal' — inverter voltage above 150 Vac or below 40 Vac.
- Growatt 07Overload time out — the inverter carried over 110% load until its overload timer expired (F07 on the ES Lite).
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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