Fault

15

PV2 voltage is too high.

5 Devices that report this code

What does the 15 error code mean?

15 on a Felicity unit indicates: PV2 voltage is too high.. It is a fault-severity event that can appear on 5 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

15 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-S-1600LG01Battery↗ view on device
15PV2 voltage is too high.Fault
Description

Fault event: PV input 2 voltage too high. Maximum allowed PV input voltage is 60Vdc; max PV voltage rating is 95V.

Recommended fix

Please check the voltage of the solar panel; it should be less than 95V. if the voltage is OK, please contact your installer.

Source:LUX-S-1600LG01.pdf · page 22
LUX-X-96050HG01Battery↗ view on device
15Slave Version Fault.Critical
Description

Firmware version mismatch on one or more slave battery modules.

Cause

Slave module firmware incompatible with the master controller.

Recommended fix

Contact our engineer to upgrade the program.

Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf · page 21
LUX-Y-48100HG01Battery↗ view on device
15Slave Version Fault.Fault
Description

Slave BMS firmware version mismatch.

Recommended fix

Contact our engineer to upgrade the program.

Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf · page 20
LUX-Y-48100HG01MNBattery↗ view on device
15Slave Version Fault.Fault
Description

Slave Version Fault.

Source:LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf · page 27
T-REX-3KLP1G01Inverter↗ view on device
15Buckboost current sensor failed.Fault
Description

Buckboost current sensor failed.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

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

Frequently asked about 15

What is the 15 error on Felicity?
15 on a Felicity unit means: PV2 voltage is too high.. It can appear on 5 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the 15 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 15 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.