LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms)
LVTopsun Fdback OC error code
The BMS detected an over-current in its current-feedback circuit.
Likely causes
- Actual DC over-current from load or charge
- Current sensor or feedback wiring fault
- Loose DC connection causing current spikes
- Inverter drawing more than the battery limit
Checks to run, in order
- 1Measure DC current with a clamp meter and compare with the display
- 2Check the inverter discharge and charge current limits
- 3Inspect DC cable terminations for looseness or heat
- 4Check the BMS current-sense wiring
Fixes
- Reduce the inverter current limit to the battery datasheet value
- Retorque the DC terminations
- Restart the battery and confirm the alarm does not return at normal current
When to escalate
If the alarm returns at currents well inside the datasheet limit, ask the distributor to check the BMS current sensor.
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 LVTopsun Fdback OC mean?
The BMS detected an over-current in its current-feedback circuit.
How do I fix LVTopsun Fdback OC?
Reduce the inverter current limit to the battery datasheet value Retorque the DC terminations Restart the battery and confirm the alarm does not return at normal current
When should I escalate LVTopsun Fdback OC?
If the alarm returns at currents well inside the datasheet limit, ask the distributor to check the BMS current sensor.
Can I reset LVTopsun Fdback OC myself?
Only after isolating the AC and DC sides and running the checks above. If LVTopsun Fdback OC returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show LVTopsun Fdback OC?
LVTopsun Fdback OC is documented for LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms). Confirm the code on your own unit's display or manual before ordering parts.
More LVTopsun error codes
- LVTopsun Ahesion FltThe BMS detected a main contactor or relay that has stuck closed (contact adhesion).
- LVTopsun Chg Bat Ov_VThe pack voltage rose above the BMS charge over-voltage limit.
- LVTopsun Chg Bat Ud_VPack voltage stayed below the BMS charge under-voltage limit while the pack was supposed to be charging.
- LVTopsun Chg Cell Ov_VCharging was stopped because a cell reached the BMS charge over-voltage limit.
- LVTopsun Chg Cell Ud_VA cell fell below the BMS charge under-voltage limit while the pack was being charged.
- LVTopsun Chg Diff_TThe temperature difference between BMS sensors exceeded the limit during charge.
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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