PCS-ARM-51Warning

Felicity ESS error PCS-ARM-51

ARM software fault - battery software undervoltage

Warning — a protection warning — the ESS unit keeps running, but deal with the cause before it escalates.

FLS-ES232LC-S

Energy storage systemWarning

What it means

ARM software fault - battery software undervoltage

Cause: Battery undervoltage detected by software.

How to fix it

  1. Reset to restart.
  2. Measure battery voltage; check contactor of high-voltage box, DC fuse.
  3. More than 3 faults in one day require manual intervention.

Source: fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf

Frequently asked questions

What does error PCS-ARM-51 mean on a Felicity ESS?

PCS-ARM-51 means: ARM software fault - battery software undervoltage. Battery undervoltage detected by software.

Is error PCS-ARM-51 a fault or a warning?

PCS-ARM-51 is a warning: the unit keeps running. Fix the underlying condition before it escalates.

How do I clear or fix error PCS-ARM-51?

Reset to restart. Measure battery voltage; check contactor of high-voltage box, DC fuse.

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.