Critical

0x1043

Battery cluster cell undervoltage alarm (level 3).

1 Devices that report this code

What does the 0x1043 error code mean?

0x1043 on a Felicity unit indicates: Battery cluster cell undervoltage alarm (level 3).. It is a critical-severity event that can appear on 1 device in the Felicity catalog. The same code may have slightly different recommended fixes depending on the device — the per-device sections below show the exact wording from each device's official manual.

This is a critical-severity code

Critical codes trip the unit offline immediately. They typically indicate hardware failure (short-circuit, IGBT, BMS) or an unsafe operating condition. Do not bypass the fault — note the code and contact authorized service.

What triggers this code

0x1043 is triggered when the unit's protection or monitoring logic detects the specific condition described above. The exact trigger depends on the device — see the per-device sections for the official manual entry for each.

FLS-ES232LC-SEnergy storage system↗ view on device
0x1043Battery cluster cell undervoltage alarm (level 3).Critical— level 3
Cause

Cell voltage < 2,300 mV.

Recommended fix

Send faults externally, limit power and request lower high voltage; immediately cut off the main circuit relay. Recovers when > 2,400 mV.

Source:FLS-ES232LC-S.pdf

Frequently asked about 0x1043

What is the 0x1043 error on Felicity?
0x1043 on a Felicity unit means: Battery cluster cell undervoltage alarm (level 3).. It can appear on 1 device in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the 0x1043 code myself?
It depends on the severity. Warning-level codes can usually be cleared by following the recommended fix. Fault and critical codes often require checking the source condition first; if the code returns immediately after restart, escalate to authorized service.
Is the 0x1043 fix the same on every device?
The cause is consistent — it's the same protection logic. The exact fix wording can differ per device because each official manual addresses model-specific context (input ranges, parallel-config notes, firmware revisions). Use the per-device section that matches your unit.
Where does this information come from?
Every entry is sourced directly from the official Felicity user manual for the affected device. The "Source" line at the bottom of each device's section shows the manual filename and page number.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.