41Fault

Felicity inverter error 41 (F41)

Host data loss

Also displayed as F41 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:

IVPS3524P1G1-LV

InverterFault

Also applies to:IVPS5048P1G1-LVIVPS7548P2G1IVPS10048P2G1IVPS3.5~10kVA-USIVPS3-5-10KVA

What it means

Host data loss — Host communication data is lost between inverters in the parallel system.

Cause: Parallel communication cables between inverters are loose, damaged or not connected well.

How to fix it

  1. Check if the communication cables are connected well and restart the inverter.
  2. If the problem remains, contact your installer.

Source: IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf, p.25

IVGM5KL-P1G1

InverterFault

Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1

What it means

BUS over voltage fault — DC bus over voltage fault.

Cause: The internal DC bus voltage exceeded its protection ceiling — typically a regulation fault in the conversion stages or a surge fed in from the PV or AC side.

How to fix it

  1. Restart the system 2~3 times
  2. If the fault still exists, please contact us for help.

Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.53

IVEM 6048

InverterFault

Also applies to:IVEM6048

What it means

Host data loss

Cause: Communication cable connection issue between paralleled inverters.

How to fix it

  1. Check if communication cables are connected well and restart the inverter
  2. If the problem remains, please contact your installer.

Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.38

IVEM8048-II

InverterFault

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

What it means

Host data loss

Cause: Host data loss in parallel communication.

How to fix it

  1. Check if communication cables are connected well and restart the inverter
  2. If the problem remains, please contact your installer.

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

IVEM8048-LV

InverterFault

Also applies to:IVEM8048

What it means

Host data loss

Cause: Communication failure between paralleled inverters.

How to fix it

  1. Check if communication cables are connected well and restart the inverter
  2. If the problem remains, please contact your installer.

Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.39

T-REX-10KLP3G01

InverterCritical

What it means

Grounding errors

Cause: The inverter's ground check failed — the PE/earth connection is missing, high-impedance, or wired incorrectly, so protective earthing cannot be guaranteed.

How to fix it

  1. Confirm correct grounding
  2. Restart the unit, if the error persists, contact the repair center.

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

T-REX-50KHP3G01

InverterFault

What it means

Balanced Bridge Software Overcurrent Fault — Balanced bridge current is too high, shutdown and restart.

Cause: The control firmware measured current in the bus-balancing bridge above its protection limit — the circuit that keeps the two bus halves matched is overloaded or faulty.

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

Frequently asked questions

What does error 41 mean on a Felicity inverter?
It depends on the model — 7 devices use code 41. On the IVPS3524P1G1-LV it means: Host data loss. The card for each model on this page gives its exact meaning and fix.
Is error 41 a fault or a warning?
41 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 41?
Check if the communication cables are connected well and restart the inverter. If the problem remains, contact your installer. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the IVPS3524P1G1-LV

All IVPS3524P1G1-LV codes

Other codes on the IVGM5KL-P1G1

All IVGM5KL-P1G1 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-10KLP3G01

All T-REX-10KLP3G01 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.