Is error 84 a fault or a warning?

It depends on the model: on some models 84 is a fault (output cut, red LED solid), on others a warning (red LED flashing, unit keeps running). Check the card for your model on this page.

How do I clear or fix error 84?

Charge the battery and check the battery connections. If the warning persists, contact the repair center. The exact steps for each affected model are listed on this page.

Felicity inverter error 84 (F84)

Faults for battery low voltage of built-in MPPT

Also displayed as F84 on some models.

Warning — the red LED flashes and the inverter keeps running. Deal with it before it escalates.

Severity differs by model — check your model below.

The exact meaning depends on your model:

IVPS/IVPM Series

InverterWarning

Also applies to:IVPS2512IVPS2524IVPS3524IVPS5024IVPS5048IVPS7548IVPS-7548IVPS10048+3

What it means

Faults for battery low voltage of built-in MPPT — The built-in MPPT charge controller reports battery low voltage.

Cause: The battery voltage measured by the built-in MPPT charge controller is too low.

How to fix it

Charge the battery and check the battery connections.
If the warning persists, contact the repair center.

Source: IVPS-IVPM User Guide.pdf, p.18

T-REX-50KHP3G01

InverterFault

What it means

Short circuit fault of inverter relay — Inverter relay not properly disconnected causing short circuit, shutdown and restart.

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

This requires service — the relay assembly is not user-replaceable.
Record the exact fault code and contact your installer or the manufacturer's service line.
Do not bypass any safety interlock.

Source: T-REX-50KHP3G01-user-manual-.pdf, p.48

Frequently asked questions

What does error 84 mean on a Felicity inverter?: It depends on the model — 2 devices use code 84. On the IVPS/IVPM Series it means: Faults for battery low voltage of built-in MPPT. The card for each model on this page gives its exact meaning and fix.
Is error 84 a fault or a warning?: It depends on the model: on some models 84 is a fault (output cut, red LED solid), on others a warning (red LED flashing, unit keeps running). Check the card for your model on this page.
How do I clear or fix error 84?: Charge the battery and check the battery connections. If the warning persists, 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

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.