Fault

F43

Parallel CAN COMM abnormality.

6 Devices that report this code

What does the F43 error code mean?

F43 on a Felicity unit indicates: Parallel CAN COMM abnormality.. It is a fault-severity event that can appear on 6 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

F43 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
F43Parallel CAN COMM abnormality.Fault
Description

Parallel CAN communication abnormality.

Cause

Parallel CAN COMM abnormality.

Recommended fix

Test the parallel communication line, restart still have problems please contact the after-sales service.

Source:Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf · page 44
IVEM 6048Inverter↗ view on device
F43Current feedback into the inverter is detected.Fault
Description

Fault: Current feedback into the inverter is detected.

Cause

Reverse-connected L/N cables or improper sharing-cable wiring in parallel/three-phase systems.

Recommended fix

1. Restart the inverter. 2. Check if L/N cables are not connected reversely in all inverters. 3. For parallel system in single phase, make sure the sharing cables are connected in all inverters. For supporting three-phase system, make sure the sharing cables are connected in the inverters in the same phase, and disconnected in the inverters in different phases. 4. if the problem remains, please contact your installer.

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 38
IVEM8048-IIInverter↗ view on device
F43Current feedback into the inverter is detected.Fault
Description

Fault: Current feedback into the inverter is detected.

Cause

Reverse current feedback detected at the inverter.

Recommended fix

1. Restart the inverter. 2. Check if L/N cables are not connected reversely in all inverters. 3. For parallel system in single phase, make sure the sharing cables are connected in all inverters. For supporting three-phase system, make sure the sharing cables are connected in the inverters in the same phase, and disconnected in the inverters in different phases. 4. if the problem remains, please contact your installer.

Source:IVEM8K-12K-II_compressed.pdf · page 45
IVEM8048-LVInverter↗ view on device
F43Current feedback into the inverter is detected.Fault
Description

Current feedback into the inverter is detected.

Cause

Reverse-connected L/N cables, or sharing cables not connected/connected across phases in three-phase setup.

Recommended fix

1. Restart the inverter. 2. Check if L/N cables are not connected reversely in all inverters. 3. For parallel system in single phase, make sure the sharing cables are connected in all inverters. For supporting three-phase system, make sure the sharing cables are connected in the inverters in the same phase, and disconnected in the inverters in different phases. 4. if the problem remains, please contact your installer.

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 39
T-REX-10KHP3G01Inverter↗ view on device
F43CAN data loss.Fault
Description

Loss of CAN bus communication data.

Recommended fix

Check if communication cables are connected well and restart the inverter. if the problem remains, please contact your installer.

Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf · page 29
T-REX-10KLP3G01Inverter↗ view on device
F43CAN data loss.Fault
Description

CAN data loss.

Cause

Communication cables not connected well.

Recommended fix

1. Check if communication cables are connected well and restart the inverter. 2. if the problem remains, please contact your installer.

Source:T-REX-10KLP3G01-Inverter-User-Guide.pdf · page 29

Frequently asked about F43

What is the F43 error on Felicity?
F43 on a Felicity unit means: Parallel CAN COMM abnormality.. It can appear on 6 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the F43 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 F43 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.