LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms)
LVTopsun SmplVolt Flt error code
The BMS voltage sampling circuit reported a fault, so the cell readings are unreliable.
Likely causes
- Voltage-sense harness or connector fault
- BMS sampling board fault
- Moisture or contamination on the sense connector
- Cell tab or sense wire damage
Checks to run, in order
- 1Compare the touchscreen cell voltages with a multimeter at the module terminals
- 2Check the sense harness connectors are fully seated
- 3Look for moisture or damage on the sense connector
- 4Check whether the readings jump or are stuck
Fixes
- Reseat the sense harness
- Dry and clean the connector
- Replace the sense harness if damaged
When to escalate
If the sampling fault persists with a known-good harness, have the distributor replace the BMS sampling 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 LVTopsun SmplVolt Flt mean?
The BMS voltage sampling circuit reported a fault, so the cell readings are unreliable.
How do I fix LVTopsun SmplVolt Flt?
Reseat the sense harness Dry and clean the connector Replace the sense harness if damaged
When should I escalate LVTopsun SmplVolt Flt?
If the sampling fault persists with a known-good harness, have the distributor replace the BMS sampling board.
Can I reset LVTopsun SmplVolt Flt myself?
Only after isolating the AC and DC sides and running the checks above. If LVTopsun SmplVolt Flt returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show LVTopsun SmplVolt Flt?
LVTopsun SmplVolt Flt 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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