Can I clear the F01 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 F01 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

F01

Q: What does F01 mean on Apollo-5KLP1G01-MX?

PV input voltage exceeds the allowed maximum. Cause: PV voltage is too high. Recommended fix: Reduce the number of PV modules in series.

Q: What does F01 mean on IVEM 6048?

Fault: Bus voltage is too high. Cause: AC Surge or internal components failed. Recommended fix: Restart the unit, if the error persists, contact the repair center.

Q: What does F01 mean on IVEM8048-LV?

Bus voltage is too high. Cause: AC Surge or internal components failed. Recommended fix: Restart the unit, if the error persists, contact the repair center.

Q: What does F01 mean on T-REX-10KHP3G01?

PV input voltage exceeds permitted range. Cause: Too many PV modules connected in series. Recommended fix: Reduce the number of PV modules in series.

Q: What does F01 mean on T-REX-10KLP3G01?

PV voltage is too high. Cause: PV input voltage exceeds inverter limits (too many PV modules in series). Recommended fix: Reduce the number of PV modules in series.

PV voltage is too high.

7 Devices that report this code

What does the F01 error code mean?

F01 on a Felicity unit indicates: PV voltage is too high.. 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

F01 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

F01PV voltage is too high.Fault

Description

PV input voltage exceeds the allowed maximum.

Cause

PV voltage is too high.

Recommended fix

Reduce the number of PV modules in series.

Source:Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf · page 42

IVEM 6048Inverter↗ view on device

F01Bus voltage is too high.Fault

Description

Fault: Bus voltage is too high.

Cause

AC Surge or internal components failed.

Recommended fix

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

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

IVEM8048-IIInverter↗ view on device

F01Bus voltage is too high.Fault

Description

Fault: Bus voltage is too high. Inverter cuts off output, fault LED solid on, ERROR icon shown on LCD.

Cause

AC Surge or internal components failed.

Recommended fix

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

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

IVEM8048-LVInverter↗ view on device

F01Bus voltage is too high.Fault

Description

Bus voltage is too high.

Cause

AC Surge or internal components 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 37

T-REX-10KHP3G01Inverter↗ view on device

F01PV voltage is too high.Fault

Description

PV input voltage exceeds permitted range.

Cause

Too many PV modules connected in series.

Recommended fix

Reduce the number of PV modules in series.

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

T-REX-10KLP3G01Inverter↗ view on device

F01PV voltage is too high.Fault

Description

PV voltage is too high.

Cause

PV input voltage exceeds inverter limits (too many PV modules in series).

Recommended fix

Reduce the number of PV modules in series.

Source:T-REX-10KLP3G01-Inverter-User-Guide.pdf · page 27

T-REX-50KHP3G01Inverter↗ view on device

F01PV1 overvoltage fault.Fault

Description

The voltage of the PV1 is too high, check the voltage of the string.

Source:T-REX-50KHP3G01-user-manual-.pdf · page 45

Frequently asked about F01

What is the F01 error on Felicity?: F01 on a Felicity unit means: PV voltage is too high.. 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 F01 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 F01 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.