Felicity IVPS3524P1G1-LV Error Codes: Causes & Fixes (28 codes)

This is the complete fault table for the Felicity IVPS3524P1G1-LV Inverter family — 28 codes shared by 6 model numbers, transcribed from the official manual. On Felicity units, a fault code means the unit has cut its output and the red LED stays solid; a warning flashes the red LED while the unit keeps running.

Also coversIVPS5048P1G1-LVIVPS7548P2G1IVPS10048P2G1IVPS3.5~10kVA-USIVPS3-5-10KVA

Last checked against the official manuals on July 10, 2026.

How to read the severity labels

  • Fault(22)— output stops · red LED solid
  • Warning(6)— unit keeps running · red LED flashing

Fault codes (22)output stops · red LED solid

13Fault

Overload happens.

Fault

The inverter is overloaded and cuts off its output; the red LED is solid on.

CauseThe connected load exceeds the rated output power of the inverter while running in battery mode.

Recommended fixTurn off the inverter, decrease the load to less than the rated output power of the inverter, then turn the inverter on again. If the overload happens while the AC input is on, wait 30 seconds and the fault will clear automatically.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

14Fault

Output voltage high.

Fault

The inverter output voltage is above the allowed range.

CauseInternal protection has triggered. Refer to the official product manual page listed on this code's source reference for the manufacturer's exact cause analysis.

Recommended fixRestart the inverter. If the fault persists, contact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

15Fault

Output short.

Fault

A short circuit is detected on the inverter AC output.

CauseThe AC output wiring or a connected load is short-circuited.

Recommended fixIf the AC input is on, cut off the AC input first, then turn off the inverter, disconnect all AC output wiring and turn it on again. If the screen still displays the fault, contact the repair center. If the inverter can work again, check the output wiring and load and make sure none of them are short-circuited.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

17Fault

Battery voltage high.

Fault

The battery voltage is above the allowed maximum.

CauseThe battery voltage is too high; on a 48V system a reading above 60V indicates a battery problem.

Recommended fixRead the battery voltage from the screen and measure the battery voltage with a multimeter. If both readings are more than 60V, the battery may have a problem and you must stop using it.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

18Fault

Over temperature.

Fault

The internal temperature of the inverter is too high.

CauseThe inverter has overheated.

Recommended fixTurn off the inverter and let it cool down. After the temperature is back to normal you can use it again.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

21Fault

Over current happen in charging mode.

Fault

Over current is detected while charging the battery.

CauseInternal protection has triggered. Refer to the official product manual page listed on this code's source reference for the manufacturer's exact cause analysis.

Recommended fixContact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

22Fault

Inv soft start timeout.

Fault

The inverter soft start did not complete in time.

CauseInternal protection has triggered. Refer to the official product manual page listed on this code's source reference for the manufacturer's exact cause analysis.

Recommended fixContact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

24Fault

Output voltage low.

Fault

The inverter output voltage is below the allowed range.

CauseA high-power load is dragging the output voltage down, or an internal fault has triggered.

Recommended fixTurn off the inverter, disconnect all AC output wiring and then turn it on. If it still shows the fault, contact the repair center. If it works normally, check whether the output is connected to a big power load; disconnect the big load, turn on the inverter and confirm it can work normally.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

27Fault

Battery disconnected.

Fault

The battery is disconnected from the inverter.

CauseThe battery connector is loose or disconnected.

Recommended fixCheck the battery connector.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 24

28Fault

Current sensor is abnormal.

Fault

The internal current sensor reports an abnormal value.

CauseInternal protection has triggered. Refer to the official product manual page listed on this code's source reference for the manufacturer's exact cause analysis.

Recommended fixContact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

32Fault

INV NTC is disconnected or abnormal.

Fault

The inverter temperature sensor (NTC) is disconnected or abnormal.

CauseThe inverter temperature sensor wiring is disconnected or the sensor failed.

Recommended fixContact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

34Fault

Heavy over load or output short.

Fault

The output is heavily overloaded or short-circuited.

CauseA heavy overload or a short circuit is present on the AC output.

Recommended fixRefer to the handling for fault 13 (overload) and fault 15 (output short).

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

40Fault

CAN data loss.

Fault

CAN communication data is lost between inverters in the parallel system.

CauseParallel communication cables between inverters are loose, damaged or not connected well.

Recommended fixCheck if the communication cables are connected well and restart the inverter. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

41Fault

Host data loss.

Fault

Host communication data is lost between inverters in the parallel system.

CauseParallel communication cables between inverters are loose, damaged or not connected well.

Recommended fixCheck if the communication cables are connected well and restart the inverter. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

42Fault

Synchronization data loss.

Fault

Synchronization data is lost between inverters in the parallel system.

CauseParallel communication cables between inverters are loose, damaged or not connected well.

Recommended fixCheck if the communication cables are connected well and restart the inverter. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

43Fault

The battery voltage of each inverter is not the same.

Fault

In the parallel system, the inverters measure different battery voltages.

CauseThe inverters do not share the same battery group, or the battery cables differ in length or material type.

Recommended fixMake sure all inverters share the same groups of batteries. Remove all loads and disconnect the AC input and PV input, then check the battery voltage of all inverters. If the values from all inverters are close, check that all battery cables are the same length and material type; otherwise, contact your installer to provide the SOP to calibrate the battery voltage of each inverter. If the problem still remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

44Fault

AC input voltage and frequency are detected different.

Fault

The inverters in the parallel system detect different AC input voltage or frequency.

CauseThe utility wiring differs between inverters, or the units do not receive utility power at the same time.

Recommended fixCheck the utility wiring connection and restart the inverter. Make sure the utility starts up at the same time; if there are breakers installed between the utility and the inverters, make sure all breakers can be turned on at the AC input at the same time. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

45Fault

AC output current unbalance.

Fault

The AC output current differs too much between inverters in the parallel system.

CauseExcessive loads, or AC input and output cables of different length or material type between inverters.

Recommended fixRestart the inverter. Remove some excessive loads and re-check the load information from the LCD of the inverters. If the values are different, check that the AC input and output cables are the same length and material type. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

46Fault

AC output mode setting is different.

Fault

The AC output mode (LCD setting #28) is not set consistently across the parallel system.

CauseLCD program #28 is set to different output modes on the paralleled inverters.

Recommended fixSwitch off the inverter and check LCD setting #28. For a parallel system in single phase, make sure no 3P1, 3P2, 3P3, 2P1 or 2P2 is set on #28. For supporting three-phase systems, make sure no PAL, 2P1 or 2P2 is set on #28. For supporting split-phase systems, make sure no PAL, 3P1, 3P2 or 3P3 is set on #28. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 25

60Fault

Current feedback into the inverter is detected.

Fault

Power is feeding back into the inverter output.

CauseL and N cables are connected reversely, or sharing cables are wired between inverters on different phases.

Recommended fixRestart the inverter. Check if the L and N cables are not connected reversely in all inverters. For a parallel system in single phase, make sure the sharing cables are connected in all inverters; for three-phase or split-phase systems, make sure the sharing cables are connected in the inverters on the same phase and disconnected in the inverters on different phases. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 26

71Fault

The firmware version of each inverter is not the same.

Fault

The inverters in the parallel system run different firmware versions.

CauseThe CPU firmware versions of the paralleled inverters differ.

Recommended fixUpdate all inverter firmware to the same version. Check the version of each inverter via the LCD setting and make sure the CPU versions are the same; if not, contact your installer to provide the firmware to update. After updating, if the problem still remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 26

72Fault

The output current of each inverter is different.

Fault

The output current differs between inverters in the parallel system.

CauseThe current-sharing cables are loose or not connected well.

Recommended fixCheck if the sharing cables are connected well and restart the inverter. If the problem remains, contact your installer.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 26

Warning codes (6)unit keeps running · red LED flashing

01Warning

Overload happens.

Warning

Overload warning; the code flashes on the LCD and the red LED flashes.

CauseThe connected load is above the inverter's rated output power.

Recommended fixReduce the connected load. The inverter forbids overload; the remaining working time depends on the percent of load.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 27

04Warning

Battery low.

Warning

The battery voltage is too low.

CauseThe battery is discharged below the low-voltage warning level.

Recommended fixThe voltage of the battery is too low; the battery should be charged.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 27

05Warning

Power derating (low utility voltage).

Warning

The inverter derates its output power because the utility voltage is low.

CauseThe AC input voltage is low (about 90-170V).

Recommended fixRead the voltage from the screen and confirm the voltage of the AC input is about 90-170V. If it is, the AC input voltage is low and the unit can work normally. If not, contact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 27

06Warning

TX NTC is disconnected.

Warning

The transformer temperature sensor (NTC) is disconnected.

CauseThe transformer temperature sensor wiring is disconnected or the sensor failed.

Recommended fixContact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 27

07Warning

INV NTC is disconnected.

Warning

The inverter temperature sensor (NTC) is disconnected.

CauseThe inverter temperature sensor wiring is disconnected or the sensor failed.

Recommended fixContact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 27

W14Warning

Input phase abnormal.

Warning

The AC input phase is abnormal. Shown as flashing warning code 14 on the LCD (distinct from solid fault code 14, output voltage high).

CauseThe AC input phase is abnormal.

Recommended fixContact the repair center.

Source:IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf· page 27

Still seeing a code on your IVPS3524P1G1-LV?

Send us the code on your screen and a Felicity technician will reply with the exact steps for your unit. Support is free for life — a first diagnosis never needs a callout.

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Related devices

Common questions about IVPS3524P1G1-LV error codes

What is the difference between a fault and a warning on the IVPS3524P1G1-LV?
A fault cuts the unit's output and the red LED stays solid — this page lists 22 of them for the IVPS3524P1G1-LV. A warning only flashes the red LED and the unit keeps running; there are 6 warning codes here. Resolve the cause of a fault before restarting; warnings can usually be cleared while the unit runs.
Which model numbers does this page cover?
The IVPS3524P1G1-LV shares its firmware and fault table with 5 other model numbers: IVPS5048P1G1-LV, IVPS7548P2G1, IVPS10048P2G1, IVPS3.5~10kVA-US, IVPS3-5-10KVA. If your unit is any of these, every code on this page applies to it.
Where do these codes come from?
Every entry was transcribed from IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf — Felicity's official documentation. Each row cites its source manual (and page where printed), so you can verify the wording before acting on it.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.