What does error W05 mean on a Felicity inverter?

It depends on the model — 2 devices use code W05. On the IVEM8048-II it means: Three-phase input missing phase. The card for each model on this page gives its exact meaning and fix.

Is error W05 a fault or a warning?

It depends on the model: on some models W05 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 W05?

Check whether the three-phase mains input is normal. The exact steps for each affected model are listed on this page.

W05

Felicity inverter error W05

Three-phase input missing phase

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:

IVEM8048-II

InverterWarning

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

What it means

Three-phase input missing phase — Warning: Three-phase input missing phase. Fault LED flashing.

Cause: Three-phase mains input is not normal (missing phase).

How to fix it

Check whether the three-phase mains input is normal.

Source: IVEM8K-12K-II_compressed.pdf, p.42

T-REX-50KHP3G01

InverterFault

What it means

Battery 1 SOC low alarm — Battery 1 SOC is too low, the battery should be charged.

Cause: Battery 1's state of charge has dropped to the low-SOC alarm threshold — little usable energy remains and the pack should be charged.

How to fix it

Power down the inverter, wait 5 minutes for capacitors to discharge, then restart.
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.44

Frequently asked questions

What does error W05 mean on a Felicity inverter?: It depends on the model — 2 devices use code W05. On the IVEM8048-II it means: Three-phase input missing phase. The card for each model on this page gives its exact meaning and fix.
Is error W05 a fault or a warning?: It depends on the model: on some models W05 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 W05?: Check whether the three-phase mains input is normal. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the IVEM8048-II

All IVEM8048-II 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.