What it means
ARM software fault - output undervoltage
Cause: Output side undervoltage (off-grid).
How to fix it
- Reset to restart.
- Off-grid output AC undervoltage.
- Check whether the device is in an overload state.
Source: FLS-ES232LC-S.pdf
Felicity ESS error PCS-ARM-12
ARM software fault - output undervoltage
Warning — a protection warning — the ESS unit keeps running, but deal with the cause before it escalates.
Frequently asked questions
- What does error PCS-ARM-12 mean on a Felicity ESS?
- PCS-ARM-12 means: ARM software fault - output undervoltage. Output side undervoltage (off-grid).
- Is error PCS-ARM-12 a fault or a warning?
- PCS-ARM-12 is a warning: the unit keeps running. Fix the underlying condition before it escalates.
- How do I clear or fix error PCS-ARM-12?
- Reset to restart. Off-grid output AC undervoltage.
Related error codes
Other codes on the FLS-ES232LC-S
- 0x10A1WarningCell voltage accumulation overvoltage alarm in battery cluster (level 1).
- 0x10A2FaultCell voltage accumulation overvoltage alarm in battery cluster (level 2).
- 0x10A3CriticalCell voltage accumulation overvoltage alarm in battery cluster (level 3).
- 0x10B1WarningCell voltage accumulation undervoltage alarm in battery cluster (level 1).
- 0x10B2FaultCell voltage accumulation undervoltage alarm in battery cluster (level 2).
- 0x10B3CriticalCell voltage accumulation undervoltage alarm in battery cluster (level 3).
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.