W01Warning

Felicity inverter error W01

Fan is locked

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:

IVEM 6048

InverterWarning

Also applies to:IVEM6048IVEM8048-LVIVEM8048

What it means

Fan is locked — Warning: Fan is locked. Beep three times every second.

Cause: Fan wiring not connected well or fan failure.

How to fix it

  1. Check if the Fan's wiring connected well.
  2. Replace the fan.

Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.36 · FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.37

IVEM8048-II

InverterWarning

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

What it means

Fan is locked — Warning: Fan is locked. Beep three times every second.

Cause: Fan wiring not connected well or fan failure.

How to fix it

  1. Check if the Fans wiring connected well.
  2. Replace the fan.

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

T-REX-50KHP3G01

InverterFault

What it means

Battery 1 overvoltage alarm — Battery 1 voltage is too high and the battery should be discharged.

Cause: Battery 1 voltage has climbed to the overvoltage alarm threshold — the warning stage before the overvoltage fault; the pack should be discharged.

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-50KHP3G01-user-manual-.pdf, p.44

Frequently asked questions

What does error W01 mean on a Felicity inverter?
It depends on the model — 4 devices use code W01. On the IVEM 6048 it means: Fan is locked. The card for each model on this page gives its exact meaning and fix.
Is error W01 a fault or a warning?
It depends on the model: on some models W01 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 W01?
Check if the Fan's wiring connected well. Replace the fan. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the IVEM 6048

All IVEM 6048 codes All IVEM8048-LV 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.