PCS-ARM-18Warning

Felicity ESS error PCS-ARM-18

ARM software fault - DC busbar 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 - DC busbar software undervoltage

Cause: DC busbar undervoltage detected by software.

How to fix it

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

Source: FLS-ES232LC-S.pdf

Frequently asked questions

What does error PCS-ARM-18 mean on a Felicity ESS?
PCS-ARM-18 means: ARM software fault - DC busbar software undervoltage. DC busbar undervoltage detected by software.
Is error PCS-ARM-18 a fault or a warning?
PCS-ARM-18 is a warning: the unit keeps running. Fix the underlying condition before it escalates.
How do I clear or fix error PCS-ARM-18?
Reset to restart. Measure battery voltage; check contactor and 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.