LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms)
LVTopsun Danger OT error code
Temperature entered the BMS danger over-temperature range.
Likely causes
- Sustained high current in a hot location
- Failed ventilation or a blocked cabinet
- Cell or connection overheating
- Temperature sensor fault
Checks to run, in order
- 1Stop charge and discharge immediately
- 2Measure the temperature of the modules and connections
- 3Check ventilation and ambient temperature
- 4Look for discoloured or heat-damaged connections
Fixes
- Let the pack cool fully before restarting
- Correct ventilation and ambient conditions
- Repair any heat-damaged connection
When to escalate
If the pack reaches the danger temperature again after cooling and with normal current, keep it isolated and call the distributor.
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 Danger OT mean?
Temperature entered the BMS danger over-temperature range.
How do I fix LVTopsun Danger OT?
Let the pack cool fully before restarting Correct ventilation and ambient conditions Repair any heat-damaged connection
When should I escalate LVTopsun Danger OT?
If the pack reaches the danger temperature again after cooling and with normal current, keep it isolated and call the distributor.
Can I reset LVTopsun Danger OT myself?
Only after isolating the AC and DC sides and running the checks above. If LVTopsun Danger OT returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show LVTopsun Danger OT?
LVTopsun Danger OT 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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