Fault

04

PV temperature is too high.

6 Devices that report this code

What does the 04 error code mean?

04 on a Felicity unit indicates: PV temperature is too high.. It is a fault-severity event that can appear on 6 different devices 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

04 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.

IVCM1012 PROInverter↗ view on device
04PV temperature is too high.Fault
Description

PV temperature is too high.

Recommended fix

Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.

Source:ICM.pdf · page 13
LUX-X-96050HG01Battery↗ view on device
04Low Cell Voltage.Warning
Description

Individual cell voltage below minimum allowed value.

Cause

Cell-level undervoltage (imbalance or deep discharge of a single cell).

Recommended fix

Stop discharging.

Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf · page 21
LUX-Y-48100HG01Battery↗ view on device
04Low Cell Voltage.Warning
Description

Individual cell voltage fell below the lower threshold.

Recommended fix

Stop discharging.

Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf · page 20
LUX-Y-48100HG01MNBattery↗ view on device
04Low Cell Voltage.Fault
Description

Low Cell Voltage.

Source:LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf · page 27
SCCM3024-IIICharge controller↗ view on device
04Battery voltage is high.Critical
Description

Battery voltage has exceeded the controller's high-voltage disconnect threshold.

Cause

Battery overvoltage condition, possibly due to incorrect battery system voltage setting or external charging source raising battery voltage above safe limits.

Recommended fix

1. Reconnect the battery to the charger. 2. if the problem remains, please contact your installer.

Source:felicitysolar SCCM-III MPPT Solar Charge Controller User Guide.pdf · page 18
T-REX-3KLP1G01Inverter↗ view on device
04Short circuit happen at PV port.Fault
Description

Short circuit happen at PV port.

Recommended fix

Check if wiring is connect well.

Source:T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf · page 37

Frequently asked about 04

What is the 04 error on Felicity?
04 on a Felicity unit means: PV temperature is too high.. It can appear on 6 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the 04 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 04 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.