48Fault

Felicity inverter error 48 (F48)

Buckup Overload Alarm

Also displayed as F48 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:

IVGM5KL-P1G1

InverterFault

Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1

What it means

Buckup Overload Alarm — The load is overloaded and should be reduced.

Cause: The load on the backup output exceeds the inverter's continuous rating, so it raises the overload alarm before protection cuts the output.

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: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.52

T-REX-3KLP1G01

InverterFault

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

What it means

Failure of the parallel system as a whole

Cause: Another inverter in the parallel group has an active fault, so the whole system reports a group-level failure until that unit is cleared.

How to fix it

Specific faults in other machines in the parallel system.

Source: T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf, p.39

T-REX-10KHP3G01

InverterFault

Also applies to:T-REX-10KLP3G01

What it means

Parallel installation is abnormal

Cause: The parallel bus detects an installation that does not form a valid group — wrong cabling topology or an inconsistent set of units — so the system will not start.

How to fix it

Contact after-sales service for installation technical guidance.

Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.29 · T-REX-10KLP3G01-Inverter-User-Guide.pdf, p.29

T-REX-50KHP3G01

InverterFault

What it means

Inverter short circuit fault — Short circuit at inverter, shutdown and restart.

Cause: A short circuit was detected at the inverter output: current spiked while voltage collapsed, pointing to a wiring fault or a shorted load.

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-50KHP3G01-user-manual-.pdf, p.47

Apollo-5KLP1G01-MX

Energy storage systemFault

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

What it means

Failure of the parallel system as a whole — Failure of the parallel system as a whole; specific faults in other machines in the parallel system.

Cause: Specific faults in other machines in the parallel system.

How to fix it

Specific faults in other machines in the parallel system.

Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.44

Frequently asked questions

What does error 48 mean on a Felicity inverter?
It depends on the model — 6 devices use code 48. On the IVGM5KL-P1G1 it means: Buckup Overload Alarm. The card for each model on this page gives its exact meaning and fix.
Is error 48 a fault or a warning?
48 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 48?
Power down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the IVGM5KL-P1G1

All IVGM5KL-P1G1 codes

Other codes on the T-REX-3KLP1G01

All T-REX-3KLP1G01 codes

Other codes on the T-REX-10KHP3G01

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

Other codes on the T-REX-50KHP3G01

All T-REX-50KHP3G01 codes

Other codes on the Apollo-5KLP1G01-MX

All Apollo-5KLP1G01-MX 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.