What is the F27 error on Felicity?

F27 on a Felicity unit means: The AC input and output wires are inversely connected.. 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 F27 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 F27 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.

Fault

F27

The AC input and output wires are inversely connected.

4 Devices that report this code

What does the F27 error code mean?

F27 on a Felicity unit indicates: The AC input and output wires are inversely connected.. It is a fault-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 fault-severity code

Fault codes stop normal operation but the unit may attempt to recover. Common causes are out-of-range conditions (voltage, current, temperature) that require checking inputs and outputs before restart.

What triggers this code

F27 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

F27The AC input and output wires are inversely connected.Fault

Description

Fault: The AC input and output wires are inversely connected.

Cause

AC input and output wires are reversed.

Recommended fix

1. Please check AC input and output wires are connected correctly. 2. if this error happens during parallel installation, please check wires connection. if they are connected correctly, please funish parallel installation first, and then restart inverters. 3. if the problem remains, please contact your installer.

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 38

IVEM8048-IIInverter↗ view on device

F27The AC input and output wires are inversely connected.Fault

Description

Fault: The AC input and output wires are inversely connected.

Cause

AC input and output wires connected reversely.

Recommended fix

Source:IVEM8K-12K-II_compressed.pdf · page 44

IVEM8048-LVInverter↗ view on device

F27The AC input and output wires are inversely connected.Fault

Description

The AC input and output wires are inversely connected.

Cause

AC input and output wiring reversed, possibly during parallel installation.

Recommended fix

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 39

T-REX-50KHP3G01Inverter↗ view on device

F27Battery 2 relay open circuit fault.Fault

Description

Battery 2 relay not closing properly causing open circuit, shutdown and restart.

Source:T-REX-50KHP3G01-user-manual-.pdf · page 46

Frequently asked about F27

What is the F27 error on Felicity?: F27 on a Felicity unit means: The AC input and output wires are inversely connected.. 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 F27 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 F27 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.