Fault

16

Primary-secondary CPU communication fault.

6 Devices that report this code

What does the 16 error code mean?

16 on a Felicity unit indicates: Primary-secondary CPU communication fault.. 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

16 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.

IVCM1012 PROInverter↗ view on device
16Primary-secondary CPU communication fault.Fault
Description

The communication between the primary and secondary cpus is faulty.

Recommended fix

Internal components failed. Restart the unit, if the error persists, contact the repair center.

Source:ICM.pdf · page 13
LUX-S-1600LG01Battery↗ view on device
16Output2 overcurrent.Fault
Description

Fault event: DC output channel 2 current exceeded its limit.

Recommended fix

Reduce the loads.

Source:LUX-S-1600LG01.pdf · page 22
LUX-Y-48100HG01Battery↗ view on device
16Slave Device Version Fault.Fault
Description

Slave device version fault.

Recommended fix

Contact our engineer to upgrade the program.

Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf · page 20
LUX-Y-48100HG01MNBattery↗ view on device
16Slave Device Version Fault.Fault
Description

Slave Device Version Fault.

Source:LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf · page 27
SCCM3024-IIICharge controller↗ view on device
16Parallel is fault.Critical
Description

Parallel-operation fault: a problem has been detected in the parallel connection between charge controllers.

Cause

Parallel communication or wiring fault between SCCM-III controllers connected in parallel (note: SCCM3024-III and SCCM4524-III do not support parallel operation).

Recommended fix

1. Restart the charger. 2. if the problem remains, please contact your installer.

Source:felicitysolar SCCM-III MPPT Solar Charge Controller User Guide.pdf · page 18
T-REX-3KLP1G01Inverter↗ view on device
16NO.2 Buckboost current sensor failed.Fault
Description

NO.2 Buckboost current sensor failed.

Recommended fix

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

Source:T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf · page 37

Frequently asked about 16

What is the 16 error on Felicity?
16 on a Felicity unit means: Primary-secondary CPU communication fault.. 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 16 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 16 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.