71Fault

Felicity inverter error 71 (F71)

The firmware version of each inverter is not the same

Also displayed as F71 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

The firmware version of each inverter is not the same — The inverters in the parallel system run different firmware versions.

Cause: The CPU firmware versions of the paralleled inverters differ.

How to fix it

  1. Update all inverter firmware to the same version.
  2. Check the version of each inverter via the LCD setting and make sure the CPU versions are the same; if not, contact your installer to provide the firmware to update.
  3. After updating, if the problem still remains, contact your installer.

Source: ivps3524p1g1-lv-ivps5048p1g1-lv-ivps7548p2g1-ivps10048p2g1-manual.pdf, p.26

IVGM5KL-P1G1

InverterFault

Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1

What it means

AC leakage current fault — AC leakage current detected.

Cause: Leakage (residual) current to ground exceeded the safety limit — commonly degraded PV insulation or a grounding fault on the array cabling.

How to fix it

  1. Check PV side cable ground connection
  2. Restart the system 2~3 times
  3. If the fault still exists, please contact us for help.

Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.55

T-REX-50KHP3G01

InverterFault

What it means

EEPROM Fault — There was an error with the EEPROM write.

Cause: A write error occurred in the EEPROM that stores the inverter's settings and calibration, so the control board cannot reliably save or recall its configuration.

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.48

Frequently asked questions

What does error 71 mean on a Felicity inverter?

It depends on the model — 3 devices use code 71. On the IVPS3524P1G1-LV it means: The firmware version of each inverter is not the same. The card for each model on this page gives its exact meaning and fix.

Is error 71 a fault or a warning?

71 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 71?

Update all inverter firmware to the same version. Check the version of each inverter via the LCD setting and make sure the CPU versions are the same; if not, contact your installer to provide the firmware to update. 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 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.