Fault

F22

Output voltage is too low.

7 Devices that report this code

What does the F22 error code mean?

F22 on a Felicity unit indicates: Output voltage is too low.. It is a fault-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 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

F22 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
F22Output voltage is too low.Fault
Description

Output voltage is too low.

Cause

Output voltage is too low.

Recommended fix

Reduce the connected load.

Source:Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf · page 43
IVEM 6048Inverter↗ view on device
F22DCDC current sensor failed.Fault
Description

Fault: DCDC current sensor failed.

Cause

DC/DC current sensor hardware failure.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 37
IVEM8048-IIInverter↗ view on device
F22DCDC current sensor failed.Fault
Description

Fault: DCDC current sensor failed.

Cause

DCDC current sensor failure.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:IVEM8K-12K-II_compressed.pdf · page 44
IVEM8048-LVInverter↗ view on device
F22DCDC current sensor failed.Fault
Description

DCDC current sensor failed.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 38
T-REX-10KHP3G01Inverter↗ view on device
F22Output voltage is too low.Fault
Description

Output voltage is below permitted level.

Recommended fix

Reduce the connected load.

Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf · page 28
T-REX-10KLP3G01Inverter↗ view on device
F22Output voltage is too low.Fault
Description

Output voltage is too low.

Cause

Connected load is too high.

Recommended fix

Reduce the connected load.

Source:T-REX-10KLP3G01-Inverter-User-Guide.pdf · page 28
T-REX-50KHP3G01Inverter↗ view on device
F22Battery 1 overcurrent fault.Fault
Description

Battery 1 current is too large, check the battery charge and discharge power.

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

Frequently asked about F22

What is the F22 error on Felicity?
F22 on a Felicity unit means: Output voltage is too low.. 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 F22 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 F22 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.