What does error W25 mean on a Felicity inverter?

It depends on the model — 2 devices use code W25. On the T-REX-10KHP3G01 it means: Phase sequence error. The card for each model on this page gives its exact meaning and fix.

Is error W25 a fault or a warning?

W25 is a warning: the red LED flashes and the unit keeps running. Fix the underlying condition before it escalates.

How do I clear or fix error W25?

Please check the phase sequence to ensure that the line sequence is correct. The exact steps for each affected model are listed on this page.

W25

Felicity inverter error W25

Phase sequence error

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

The exact meaning depends on your model:

T-REX-10KHP3G01

InverterWarning

What it means

Phase sequence error — Phase sequence error warning.

Cause: The three-phase line order the inverter sees does not match the expected sequence, so it warns until the phase wiring is corrected.

How to fix it

Please check the phase sequence to ensure that the line sequence is correct.

Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.27

Apollo-5KLP1G01-MX

Energy storage systemWarning

Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2

What it means

Phase Sequence Errors — Phase sequence error warning between input and output AC power lines.

Cause: The AC input and output power lines are connected in the wrong phase order, so the phase sequence between the input and output sides does not correspond.

How to fix it

Check that the input and output power lines correspond.

Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.42

Frequently asked questions

What does error W25 mean on a Felicity inverter?: It depends on the model — 2 devices use code W25. On the T-REX-10KHP3G01 it means: Phase sequence error. The card for each model on this page gives its exact meaning and fix.
Is error W25 a fault or a warning?: W25 is a warning: the red LED flashes and the unit keeps running. Fix the underlying condition before it escalates.
How do I clear or fix error W25?: Please check the phase sequence to ensure that the line sequence is correct. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the T-REX-10KHP3G01

All T-REX-10KHP3G01 codes

Other codes on the Apollo-5KLP1G01-MX

All Apollo-5KLP1G01-MX 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.