Primary-secondary CPU communication fault
Also displayed as F16 on some models.
Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.
The exact meaning depends on your model:
Also applies to:IVCM2024 PROIVCM3024 PRO
Primary-secondary CPU communication fault — The communication between the primary and secondary cpus is faulty.
Cause: Communication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Source: ICM.pdf, p.13
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
NO.2 Buckboost current sensor failed
Cause: The second buck-boost current sensor returned an out-of-range or implausible reading, so the control board can no longer trust that channel's current measurement.
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, p.37
Also applies to:IVEM6048
Over current happen at PV port
Cause: Overcurrent at the PV input.
Restart the unit, if the error persists, contact the repair center.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.37
Also applies to:IVEM12048-IIIVEM 8K-12K Series II
Over current happen at PV port
Cause: Over current detected at the PV input port.
Restart the unit, if the error persists, contact the repair center.
Source: IVEM8K-12K-II_compressed.pdf, p.43
Also applies to:IVEM8048
Over current happen at PV port
Cause: Current flowing in from the PV array exceeded the charge stage's protection limit.
Restart the unit, if the error persists, contact the repair center.
Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.38
Battery 1 Overvoltage fault — Battery 1 voltage is too high, the battery should be discharged.
Cause: Battery 1 voltage tripped the hardware overvoltage protection, which acts independently of the firmware — the pack is above the permitted range and should be discharged.
Source: T-REX-50KHP3G01-user-manual-.pdf, p.46
Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
NO.2 Buckboost current sensor failed — Number 2 Buckboost current sensor failed.
Cause: NO.2 Buckboost current sensor failed.
Restart the unit, if the error persists, contact the repair center.
Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.43
Output2 overcurrent — Fault event: DC output channel 2 current exceeded its limit.
Cause: Current on DC output channel 2 exceeded its limit — the connected load draws more than the output rating, or the output wiring has a short.
Source: LUX-S-1600LG01.pdf, p.22
Also applies to:LUX-Y-48100HCG01LUX-Y-48100HMG01LUX-Y-48100HR13G01LUX-Y-48100HR9G01
Slave Device Version Fault
Cause: A slave device's firmware or protocol version does not match the master controller — the program must be upgraded before the system can run.
Contact our engineer to upgrade the program.
Source: LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf, p.20
Slave Device Version Fault
Cause: A slave device's firmware or protocol version does not match the master controller — the program must be upgraded before the system can run.
Source: LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf, p.27
Also applies to:SCCM4524-IIISCCM4548-IIISCCM6048-IIISCCM8048-IIISCCM10048-IIISCCM12048-III
Parallel is fault — 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).
Source: felicitysolar SCCM-III MPPT Solar Charge Controller User Guide.pdf, p.18
Prefer the full written guide? Read the complete Felicity inverter error-code guide
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.