How do I clear or fix error 67?

1. Restart the system 2~3 times; 2. The exact steps for each affected model are listed on this page.

Felicity inverter error 67 (F67)

Main and auxiliary DSP communication fault

Also displayed as F67 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

Main and auxiliary DSP communication fault — Please check whether the load on backup port exceeds the generator specifications.

Cause: Communication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.

How to fix it

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

Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.52 · Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.55

T-REX-50KHP3G01

InverterFault

What it means

Fan 2 Fault — Fan 2 is faulty, check whether the fan is normal.

Cause: Internal cooling fan failure detected. Often caused by dust buildup, bearing wear, or debris fouling the fan blades.

How to fix it

Power down the inverter and remove the cover (only if the unit is field-serviceable per the manual).
Inspect the fan for debris and clean.
If the fan does not spin freely or is noisy, replace it with the manufacturer's OEM part.

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

Frequently asked questions

What does error 67 mean on a Felicity inverter?: It depends on the model — 2 devices use code 67. On the IVGM5KL-P1G1 it means: Main and auxiliary DSP communication fault. The card for each model on this page gives its exact meaning and fix.
Is error 67 a fault or a warning?: 67 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 67?: 1. Restart the system 2~3 times; 2. 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-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.