24Fault

Felicity inverter error 24 (F24)

Output voltage low

Also displayed as F24 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 voltage low — The inverter output voltage is below the allowed range.

Cause: A high-power load is dragging the output voltage down, or an internal fault has triggered.

How to fix it

  1. Turn off the inverter, disconnect all AC output wiring and then turn it on.
  2. If it still shows the fault, contact the repair center.
  3. If it works normally, check whether the output is connected to a big power load; disconnect the big load, turn on the inverter and confirm it can work normally.

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

IVCM1012 PRO

InverterFault

Also applies to:IVCM2024 PROIVCM3024 PRO

What it means

Excessive inverter current

Cause: The inverter stage current exceeded its software protection limit: the connected loads, or a startup surge from motor or compressor equipment, are drawing more current than the rating.

How to fix it

Reduce the connected load by switching off some equipment.

Source: ICM.pdf, p.14

T-REX-3KLP1G01

InverterFault

Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01

What it means

Over current or surge detected by Software

Cause: The control software measured a current or surge on the power stage beyond its protection limit. The software trip catches sustained overcurrent, as opposed to the instantaneous hardware trip of code 25.

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.38

IVEM 6048

InverterFault

Also applies to:IVEM6048

What it means

Inverter current sensor failed

Cause: Inverter current sensor hardware failure.

How to fix it

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

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

Inverter current sensor failed

Cause: Inverter current sensor failure.

How to fix it

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

Source: IVEM8K-12K-II_compressed.pdf, p.44

IVEM8048-LV

InverterFault

Also applies to:IVEM8048

What it means

Inverter current sensor failed

Cause: The inverter-stage current sensor returned an out-of-range or implausible reading, so the control board can no longer trust its inverter current measurement.

How to fix it

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

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

T-REX-10KHP3G01

InverterFault

Also applies to:T-REX-10KLP3G01

What it means

Over current or surge detected by Software

Cause: The control software measured a current or surge on the power stage beyond its protection limit. The software trip catches sustained overcurrent, as opposed to the instantaneous hardware trip of F25.

How to fix it

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

Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.28 · t-rex-10klp3g01-inverter-user-guide-english.pdf, p.28

T-REX-50KHP3G01

InverterFault

What it means

Battery 1 reverse connection fault — Battery 1 positive and negative poles is reversed, check the battery wiring.

Cause: Battery 1 is connected with positive and negative poles reversed, so the battery stage blocks it until the wiring is corrected.

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

Over current or surge detected by Software — Over current or surge detected by software protection.

Cause: Over current or surge detected by software.

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

Frequently asked questions

What does error 24 mean on a Felicity inverter?

It depends on the model — 11 devices use code 24. On the IVPS/IVPM Series it means: Output voltage low. The card for each model on this page gives its exact meaning and fix.

Is error 24 a fault or a warning?

24 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 24?

Turn off the inverter, disconnect all AC output wiring and then turn it on. If it still shows 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 IVCM1012 PRO

All IVCM1012 PRO codes

Other codes on the T-REX-3KLP1G01

All T-REX-3KLP1G01 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

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.