Can I clear the F19 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 F19 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.

Critical

F19

Q: What does F19 mean on Apollo-5KLP1G01-MX?

Output short circuit detected. Cause: Output short circuited. Recommended fix: Check if wiring is connected well and remove abnormal load.

Q: What does F19 mean on IVEM 6048?

Fault: Over temperature happen at battery circuit. Cause: The temperature of internal battery converter component is over the limitation. Recommended fix: Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.

Q: What does F19 mean on IVEM8048-II?

Fault: Over temperature happen at Convert L circuit. Cause: The temperature of Convert L battery converter component is over the limitation. Recommended fix: Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.

Q: What does F19 mean on IVEM8048-LV?

Over temperature happen at Convert L circuit. Cause: The temperature of Convert L battery converter component is over the limitation. Recommended fix: Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.

Q: What does F19 mean on T-REX-10KHP3G01?

Short circuit on the inverter output. Recommended fix: Check if wiring is connected well and remove abnormal load.

Q: What does F19 mean on T-REX-10KLP3G01?

Output short circuited. Cause: Wiring fault or abnormal load on the output. Recommended fix: Check if wiring is connected well and remove abnormal load.

Output short circuited.

7 Devices that report this code

What does the F19 error code mean?

F19 on a Felicity unit indicates: Output short circuited.. It is a critical-severity event that can appear on 7 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 critical-severity code

Critical codes trip the unit offline immediately. They typically indicate hardware failure (short-circuit, IGBT, BMS) or an unsafe operating condition. Do not bypass the fault — note the code and contact authorized service.

What triggers this code

F19 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.

Apollo-5KLP1G01-MXEnergy storage system↗ view on device

F19Output short circuited.Critical

Description

Output short circuit detected.

Cause

Output short circuited.

Recommended fix

Check if wiring is connected well and remove abnormal load.

Source:Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf · page 43

IVEM 6048Inverter↗ view on device

F19Over temperature happen at battery circuit.Fault

Description

Fault: Over temperature happen at battery circuit.

Cause

The temperature of internal battery converter component is over the limitation.

Recommended fix

Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 37

IVEM8048-IIInverter↗ view on device

F19Over temperature happen at Convert L circuit.Fault

Description

Fault: Over temperature happen at Convert L circuit.

Cause

The temperature of Convert L battery converter component is over the limitation.

Recommended fix

Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.

Source:IVEM8K-12K-II_compressed.pdf · page 43

IVEM8048-LVInverter↗ view on device

F19Over temperature happen at Convert L circuit.Fault

Description

Over temperature happen at Convert L circuit.

Cause

The temperature of Convert L battery converter component is over the limitation.

Recommended fix

Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 38

T-REX-10KHP3G01Inverter↗ view on device

F19Output short circuited.Critical

Description

Short circuit on the inverter output.

Recommended fix

Check if wiring is connected well and remove abnormal load.

Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf · page 28

T-REX-10KLP3G01Inverter↗ view on device

F19Output short circuited.Critical

Description

Output short circuited.

Cause

Wiring fault or abnormal load on the output.

Recommended fix

Check if wiring is connected well and remove abnormal load.

Source:T-REX-10KLP3G01-Inverter-User-Guide.pdf · page 28

T-REX-50KHP3G01Inverter↗ view on device

F19Battery 2 Undervoltage fault.Fault

Description

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

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

Frequently asked about F19

What is the F19 error on Felicity?: F19 on a Felicity unit means: Output short circuited.. It can appear on 7 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the F19 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 F19 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.