72Fault

Felicity inverter error 72 (F72)

The output current of each inverter is different

Also displayed as F72 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 output current of each inverter is different — The output current differs between inverters in the parallel system.

Cause: The current-sharing cables are loose or not connected well.

How to fix it

  1. Check if the sharing cables are connected well and restart the inverter.
  2. If the problem 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

Grid Relay open circuit fault — Grid relay open circuit detected during self-check.

Cause: A safety relay inside the inverter has failed self-test or is stuck. The inverter is designed to refuse grid connection in this state, so this is not an issue you can clear with restart cycles.

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.55

T-REX-50KHP3G01

InverterFault

What it means

12V auxiliary power supply fault — Failure of 12V auxiliary power supply.

Cause: The internal 12 V auxiliary supply that powers the control and driver circuits has failed, so the inverter cannot keep its own electronics running reliably.

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 72 mean on a Felicity inverter?

It depends on the model — 3 devices use code 72. On the IVPS3524P1G1-LV it means: The output current of each inverter is different. The card for each model on this page gives its exact meaning and fix.

Is error 72 a fault or a warning?

72 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 72?

Check if the sharing 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 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.