LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms)
LVTopsun SmplTemp Flt error code
The BMS temperature sampling circuit reported a fault.
Likely causes
- Temperature sensor or wiring fault
- Sensor connector unseated
- BMS sampling board fault
- Damaged sensor cable
Checks to run, in order
- 1Compare sensor readings on the Temp Info page
- 2Check the sensor connectors
- 3Look for a reading that is fixed, open-circuit or implausible
- 4Check the sensor cable for damage
Fixes
- Reseat or replace the temperature sensor
- Replace the sensor cable if damaged
- Restart and confirm all sensors read plausibly
When to escalate
If the temperature readings stay implausible after replacing the sensor, ask the distributor to check the BMS 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 SmplTemp Flt mean?
The BMS temperature sampling circuit reported a fault.
How do I fix LVTopsun SmplTemp Flt?
Reseat or replace the temperature sensor Replace the sensor cable if damaged Restart and confirm all sensors read plausibly
When should I escalate LVTopsun SmplTemp Flt?
If the temperature readings stay implausible after replacing the sensor, ask the distributor to check the BMS board.
Can I reset LVTopsun SmplTemp Flt myself?
Only after isolating the AC and DC sides and running the checks above. If LVTopsun SmplTemp 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 SmplTemp Flt?
LVTopsun SmplTemp 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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