SPF 3000TL LVM-ES / SPF 3500–5000 ES Lite off-grid (fault codes 01–81)
Growatt 55 error code
Over DC voltage in the AC output / output voltage unbalanced (F55 on the ES Lite).
Likely causes
- Heavily unbalanced load on a split output
- DC injection from a connected appliance
- Output-stage fault
Checks to run, in order
- 1Measure output voltage on each output leg
- 2Redistribute the load across the output
- 3Check the connected appliances for faults
Fixes
- Balance the load and restart
- Remove the suspect appliance
- Re-measure the output voltage
When to escalate
If the error happens again after restart, 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 55 mean?
Over DC voltage in the AC output / output voltage unbalanced (F55 on the ES Lite).
How do I fix Growatt 55?
Balance the load and restart Remove the suspect appliance Re-measure the output voltage
When should I escalate Growatt 55?
If the error happens again after restart, return the unit to a Growatt repair centre.
Can I reset Growatt 55 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt 55 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Growatt 55?
Growatt 55 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 03Battery is over-charged / battery voltage is too high (F03 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.
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