What does error 0x1023 mean on a Felicity ESS?

0x1023 means: Battery cluster cell undertemperature alarm (level 3). Cell minimum temperature < -30°C.

Is error 0x1023 a fault or a warning?

0x1023 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

How do I clear or fix error 0x1023?

Send faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when Temp_min > 0°C.

0x1023

Felicity ESS error 0x1023

Q: Is error 0x1023 a fault or a warning?

0x1023 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

Q: How do I clear or fix error 0x1023?

Send faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when Temp_min > 0°C.

Battery cluster cell undertemperature alarm (level 3)

Critical — the ESS unit shuts down and latches a protection fault. Don't keep restarting it — the cause needs checking first.

FLS-ES232LC-S

Energy storage systemCritical

What it means

Battery cluster cell undertemperature alarm (level 3)

Cause: Cell minimum temperature < -30°C.

How to fix it

Send faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay.
Recovers when Temp_min > 0°C.

Source: FLS-ES232LC-S.pdf

Frequently asked questions

What does error 0x1023 mean on a Felicity ESS?: 0x1023 means: Battery cluster cell undertemperature alarm (level 3). Cell minimum temperature < -30°C.
Is error 0x1023 a fault or a warning?: 0x1023 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
How do I clear or fix error 0x1023?: Send faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when Temp_min > 0°C.

Related error codes

Other codes on the FLS-ES232LC-S

All FLS-ES232LC-S codes

Prefer the full written guide? Read the complete Felicity inverter error-code guide

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