Fault

FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON)

CELL TEMPERATURE LOW.

1 Devices that report this code

What does the FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON) error code mean?

FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON) on a Felicity unit indicates: CELL TEMPERATURE LOW.. It is a fault-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 fault-severity code

Fault codes stop normal operation but the unit may attempt to recover. Common causes are out-of-range conditions (voltage, current, temperature) that require checking inputs and outputs before restart.

What triggers this code

FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON) 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.

LUX-E-48100LG04Battery↗ view on device
FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON)CELL TEMPERATURE LOW.Fault
Cause

An individual cell temperature fell below the lower protection threshold (charge: below 0°C; discharge: below -20°C).

Recommended fix

Warm the environment until cells are within the operating range (Charge: 0°C–55°C, Discharge: -20°C–55°C). The fault will self-clear once temperature normalises. if the fault persists, contact the local distributor.

Source:LUX-E-48100LG04-Lithium-Battery-User-Guide.pdf · page 12

Frequently asked about FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON)

What is the FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON) error on Felicity?
FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON) on a Felicity unit means: CELL TEMPERATURE LOW.. 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 FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON) 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 FAULT (RED ON, LED1=OFF, LED2=ON, LED3=OFF, LED4=ON) 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.