15Fault

Felicity inverter error 15 (F15)

Output short

Also displayed as F15 on some models.

Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.

The exact meaning depends on your model:

IVPS/IVPM Series

InverterFault

Also applies to:IVPS2512IVPS2524IVPS3524IVPS5024IVPS5048IVPS7548IVPS-7548IVPS10048+9

What it means

Output short — A short circuit is detected on the inverter AC output.

Cause: The AC output wiring or a connected load is short-circuited.

How to fix it

  1. If the AC input is on, cut off the AC input first, then turn off the inverter, disconnect all AC output wiring and turn it on again.
  2. If the screen still displays the fault, contact the repair center.
  3. If the inverter can work again, check the output wiring and load and make sure none of them are short-circuited.

Source: IVPS-IVPM User Guide.pdf, p.17 · ivps3524p1g1-lv-ivps5048p1g1-lv-ivps7548p2g1-ivps10048p2g1-manual.pdf, p.24

T-REX-3KLP1G01

InverterFault

Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01T-REX-10KHP3G01T-REX-10KLP3G01

What it means

Buckboost current sensor failed

Cause: The buck-boost current sensor returned an out-of-range or implausible reading, so the control board can no longer trust that stage's current measurement.

How to fix it

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

Source: t-rex-3-3.6-4.6-5-6klp1g01-user-guide-english.pdf, p.37 · T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.28 · t-rex-10klp3g01-inverter-user-guide-english.pdf, p.27

IVEM 6048

InverterFault

Also applies to:IVEM6048

What it means

PV power is abnormal

Cause: PV power exceeds normal limits (too many PV modules).

How to fix it

Reduce the number of PV modules.

Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.37

IVEM8048-II

InverterFault

Also applies to:IVEM12048-IIIVEM 8K-12K Series II

What it means

PV power is abnormal

Cause: PV input power exceeds the inverter's allowed maximum.

How to fix it

Reduce the number of PV modules.

Source: IVEM8K-12K-II_compressed.pdf, p.43

IVEM8048-LV

InverterFault

Also applies to:IVEM8048

What it means

PV power is abnormal

Cause: Excessive PV power input.

How to fix it

Reduce the number of PV modules.

Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.38

T-REX-50KHP3G01

InverterFault

What it means

Battery 2 software overvoltage fault — Battery 2 voltage is too high, the battery should be discharged.

Cause: The control firmware measured battery 2 voltage above the protection limit — the pack is overcharged or its configuration exceeds the inverter's battery range, and it should be discharged.

How to fix it

  1. Power down the inverter, wait 5 minutes for capacitors to discharge, then restart.
  2. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.

Source: t-rex-25-50khp3g01-user-guide-en.pdf, p.46

Apollo-5KLP1G01-MX

Energy storage systemCritical

Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2

What it means

Buckboost current sensor failed

Cause: Buckboost current sensor failed.

How to fix it

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

Source: t-rex-5klp1g01-t-rex-6klp1g01-datasheet-en.pdf, p.43

LUX-S-1600LG01

BatteryFault

What it means

PV2 voltage is too high — Fault event: PV input 2 voltage too high. Maximum allowed PV input voltage is 60Vdc; max PV voltage rating is 95V.

Cause: A fault has been detected in the PV input stage — usually a short, ground fault, or isolation failure between the PV array and the inverter chassis. Wet connectors, damaged cable insulation, or moisture in a junction box are common causes.

How to fix it

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

Source: LUX-S-1600LG01.pdf, p.22

LUX-X-96050HG01

BatteryCritical

Also applies to:LUX-X-96050HMG01LUX-X-96050HCG01

What it means

Slave Version Fault — Firmware version mismatch on one or more slave battery modules.

Cause: Slave module firmware incompatible with the master controller.

How to fix it

Contact our engineer to upgrade the program.

Source: lux-x-96050hg01-datasheet-english.pdf, p.21

LUX-Y-48100HG01

BatteryFault

Also applies to:LUX-Y-48100HCG01LUX-Y-48100HMG01LUX-Y-48100HR13G01LUX-Y-48100HR9G01

What it means

Slave Version Fault — Slave BMS firmware version mismatch.

Cause: Slave module firmware incompatible with the master controller.

How to fix it

Contact our engineer to upgrade the program.

Source: LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf, p.20

LUX-Y-48100HG01MN

BatteryFault

What it means

Slave Version Fault

Cause: Slave module firmware incompatible with the master controller.

How to fix it

  1. Power down the inverter, wait 5 minutes for capacitors to discharge, then restart.
  2. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.

Source: LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf, p.27

Frequently asked questions

What does error 15 mean on a Felicity inverter?

It depends on the model — 14 devices use code 15. On the IVPS/IVPM Series it means: Output short. The card for each model on this page gives its exact meaning and fix.

Is error 15 a fault or a warning?

15 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.

How do I clear or fix error 15?

If the AC input is on, cut off the AC input first, then turn off the inverter, disconnect all AC output wiring and turn it on again. If the screen still displays the fault, contact the repair center. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the IVPS/IVPM Series

All IVPS/IVPM Series codes All IVPS3524P1G1-LV codes

Other codes on the T-REX-3KLP1G01

All T-REX-3KLP1G01 codes All T-REX-10KHP3G01 codes All T-REX-10KLP3G01 codes

Other codes on the IVEM 6048

All IVEM 6048 codes

Other codes on the IVEM8048-II

All IVEM8048-II codes

Other codes on the IVEM8048-LV

All IVEM8048-LV codes

Other codes on the T-REX-50KHP3G01

All T-REX-50KHP3G01 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.