Fault

F45

Parallel Synchronisation Signal Abnormal.

7 Devices that report this code

What does the F45 error code mean?

F45 on a Felicity unit indicates: Parallel Synchronisation Signal Abnormal.. 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

F45 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
F45Parallel Synchronisation Signal Abnormal.Fault
Description

Parallel synchronisation signal abnormal.

Cause

Parallel Synchronisation Signal Abnormal.

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
F45The output current of each inverter is different.Fault
Description

Fault: The output current of each inverter is different.

Cause

Sharing cables not connected well between paralleled inverters.

Recommended fix

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

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 39
IVEM8048-IIInverter↗ view on device
F45The output current of each inverter is different.Fault
Description

Fault: The output current of each inverter is different.

Cause

Output current imbalance between parallel inverters.

Recommended fix

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

Source:IVEM8K-12K-II_compressed.pdf · page 45
IVEM8048-LVInverter↗ view on device
F45The output current of each inverter is different.Fault
Description

The output current of each inverter is different.

Cause

Sharing cable connection issue between paralleled inverters.

Recommended fix

1. Check if sharing cables are connected well and restart the inverter. 2. 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
F45Synchronization data loss.Fault
Description

Synchronization data loss between paralleled units.

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
F45Synchronization data loss.Fault
Description

Synchronization 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
T-REX-50KHP3G01Inverter↗ view on device
F45Inverter voltage fault.Fault
Description

Inverter voltage is too high, shutdown and restart.

Source:T-REX-50KHP3G01-user-manual-.pdf · page 47

Frequently asked about F45

What is the F45 error on Felicity?
F45 on a Felicity unit means: Parallel Synchronisation Signal Abnormal.. 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 F45 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 F45 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.