What is the W01 error on Felicity?

W01 on a Felicity unit means: Fan is locked.. It can appear on 4 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.

Can I clear the W01 code myself?

It depends on the severity. Warning-level codes can usually be cleared by following the recommended fix. Fault and critical codes often require checking the source condition first; if the code returns immediately after restart, escalate to authorized service.

Is the W01 fix the same on every device?

The cause is consistent — it's the same protection logic. The exact fix wording can differ per device because each official manual addresses model-specific context (input ranges, parallel-config notes, firmware revisions). Use the per-device section that matches your unit.

Where does this information come from?

Every entry is sourced directly from the official Felicity user manual for the affected device. The "Source" line at the bottom of each device's section shows the manual filename and page number.

Warning

W01

Fan is locked.

4 Devices that report this code

What does the W01 error code mean?

W01 on a Felicity unit indicates: Fan is locked.. It is a warning-severity event that can appear on 4 different devices in the Felicity catalog. The same code may have slightly different recommended fixes depending on the device — the per-device sections below show the exact wording from each device's official manual.

This is a warning-level code

Warning codes do not stop the unit. They flag a condition that should be addressed before it escalates — usually a near-threshold reading or a configuration check.

What triggers this code

W01 is triggered when the unit's protection or monitoring logic detects the specific condition described above. The exact trigger depends on the device — see the per-device sections for the official manual entry for each.

IVEM 6048Inverter↗ view on device

W01Fan is locked.Warning

Description

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

Cause

Fan wiring not connected well or fan failure.

Recommended fix

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

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 36

IVEM8048-IIInverter↗ view on device

W01Fan is locked.Warning

Description

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

Cause

Fan wiring not connected well or fan failure.

Recommended fix

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

Source:IVEM8K-12K-II_compressed.pdf · page 42

IVEM8048-LVInverter↗ view on device

W01Fan is locked.Warning

Description

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

Cause

Fan wiring not connected well or fan failure.

Recommended fix

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

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 37

T-REX-50KHP3G01Inverter↗ view on device

W01Battery 1 overvoltage alarm.Fault

Description

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

Source:T-REX-50KHP3G01-user-manual-.pdf · page 44

Frequently asked about W01

What is the W01 error on Felicity?: W01 on a Felicity unit means: Fan is locked.. It can appear on 4 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the W01 code myself?: It depends on the severity. Warning-level codes can usually be cleared by following the recommended fix. Fault and critical codes often require checking the source condition first; if the code returns immediately after restart, escalate to authorized service.
Is the W01 fix the same on every device?: The cause is consistent — it's the same protection logic. The exact fix wording can differ per device because each official manual addresses model-specific context (input ranges, parallel-config notes, firmware revisions). Use the per-device section that matches your unit.
Where does this information come from?: Every entry is sourced directly from the official Felicity user manual for the affected device. The "Source" line at the bottom of each device's section shows the manual filename and page number.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.