What is the W04 error on Felicity?

W04 on a Felicity unit means: Grid anomaly.. It can appear on 2 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.

Can I clear the W04 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 W04 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

W04

Q: What does W04 mean on IVEM8048-II?

Warning: Grid anomaly. Grid icon blinking. Cause: Grid input is over voltage or over frequency. Recommended fix: Check whether the input is overvoltage or overfrequency.

Grid anomaly.

2 Devices that report this code

What does the W04 error code mean?

W04 on a Felicity unit indicates: Grid anomaly.. It is a warning-severity event that can appear on 2 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

W04 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.

IVEM8048-IIInverter↗ view on device

W04Grid anomaly.Warning

Description

Warning: Grid anomaly. Grid icon blinking.

Cause

Grid input is over voltage or over frequency.

Recommended fix

Check whether the input is overvoltage or overfrequency.

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

T-REX-50KHP3G01Inverter↗ view on device

W04Battery 2 undervoltage alarm.Fault

Description

Battery 2 voltage is too low, the battery should be charged.

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

Frequently asked about W04

What is the W04 error on Felicity?: W04 on a Felicity unit means: Grid anomaly.. It can appear on 2 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the W04 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 W04 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.