DEYE SUN SG02LP2-US Hybrid Error Codes: Causes & Fixes (19 codes)

This is the complete fault table for the DEYE SUN SG02LP2-US Hybrid Inverter family — 19 codes shared by 6 model numbers, transcribed from the official manual. On DEYE 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 coversSUN-5K-SG02LP2-US-AM2SUN-6K-SG02LP2-US-AM2SUN-7.6K-SG02LP2-US-AM2SUN-8K-SG02LP2-US-AM2SUN-10K-SG02LP2-US-AM3SUN-12K-SG02LP2-US-AM3

Last checked against the official manuals on July 11, 2026.

How to read the severity labels

  • Fault(19)— output stops · red LED solid

Fault codes (19)output stops · red LED solid

F08Fault

GFDI Relay Failure.

Fault

GFDI_Relay_Failure - ground fault detector/interrupter relay fault.

CauseIn a split-phase (120/240Vac) or three-phase (120/208Vac) system, the backup load port N line is not connected to ground, so the GFDI relay check fails.

Recommended fix1. In a split-phase (120/240Vac) or three-phase (120/208Vac) system, connect the backup load port N line to ground. 2. if the fault still exists, contact us for help.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F13Fault

Working Mode Change.

Fault

Working mode change - the inverter's working mode has been changed.

CauseThe grid type or frequency setting has been changed, the battery mode has been changed to 'No battery' mode, or (on some old firmware versions) the system's work mode has been changed.

Recommended fixGenerally it disappears automatically. if it stays the same, turn off the DC switch and AC switch, wait for one minute, then turn on the DC/AC switches. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F18Fault

AC Overcurrent (Hardware).

Fault

AC over current fault of hardware - AC side overcurrent fault detected by hardware.

CauseThe AC-side current exceeded the hardware protection limit, typically because the backup load power and common load power are beyond the allowed range.

Recommended fix1. Check whether the backup load power and common load power are within the range. 2. Restart and check whether it is normal. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F20Fault

DC Overcurrent (Hardware).

Fault

DC over current fault of the hardware - DC side overcurrent fault.

CauseThe DC-side current exceeded the hardware protection limit; a PV module or battery connection problem, or starting the inverter under a high power load in off-grid mode, can trigger it.

Recommended fix1. Check the PV module connection and battery connection. 2. In off-grid mode, starting the inverter with a high power load may report F20 - reduce the connected load power. 3. Turn off the DC switch and AC switch, wait one minute, then turn on the DC/AC switches again. 4. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F22Fault

Remote Emergency Stop.

Fault

Tz_EmergStop_Fault - the inverter has been shut down remotely.

CauseA remote shutdown command was issued; the inverter is being remotely controlled.

Recommended fixPlease contact your installer for help.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F23Fault

AC Leakage Transient Overcurrent.

Fault

AC leakage current is transient over current - leakage (residual) current fault.

CauseThe leakage current spiked beyond the transient limit, usually due to a PV-side cable ground connection problem.

Recommended fix1. Check the PV side cable ground connection. 2. Restart the system 2~3 times. 3. if the fault still exists, contact us for help.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F24Fault

DC Insulation Impedance Failure.

Fault

DC insulation impedance failure - the PV isolation resistance is too low.

CauseThe insulation resistance between the PV array and ground is below the limit; the PV panel connections or the inverter's PE grounding may be faulty.

Recommended fix1. Check that the connection of the PV panels and the inverter is firm and correct. 2. Check whether the PE cable of the inverter is connected to ground. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F26Fault

DC Busbar Unbalanced.

Fault

The DC busbar is unbalanced - the internal DC BUS voltages are unbalanced.

CauseWhen the hybrid inverter runs in split-phase mode and the load on L1 differs greatly from the load on L2, F26 is reported.

Recommended fix1. Wait for a while and check whether it returns to normal. 2. Restart the system 2~3 times. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F29Fault

Parallel CAN Bus Fault.

Fault

Parallel CANBus fault - communication fault between paralleled inverters.

CauseIn parallel mode, the parallel communication cable connection or the hybrid inverter communication address setting is incorrect; F29 also appears normally during parallel system startup until all inverters are in ON status.

Recommended fix1. In parallel mode, check the parallel communication cable connection and the hybrid inverter communication address setting. 2. During the parallel system startup period, inverters will report F29; when all inverters are in ON status, it disappears automatically. 3. if the fault still exists, contact us for help.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 54

F34Fault

AC Overcurrent Fault.

Fault

AC Overcurrent fault - the backup load exceeds the allowed power.

CauseThe load connected to the backup port exceeds the allowed power range.

Recommended fix1. Check the backup load connected and make sure it is in the allowed power range. 2. if the fault still exists, contact us for help.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F35Fault

No AC Grid (No Utility).

Fault

No AC grid - no utility grid detected.

CauseThe utility grid is lost or not detected at the grid port - a grid outage, a bad grid connection, or an open switch between the inverter and the grid.

Recommended fix1. Confirm whether the grid is lost. 2. Check that the grid connection is good. 3. Check that the switch between the inverter and the grid is on. 4. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F41Fault

Parallel System Stop.

Fault

Parallel system stop - the parallel system has stopped.

CauseOne hybrid inverter in the parallel system is in OFF status, so the other hybrid inverters in the parallel system report the F41 fault.

Recommended fix1. Check the hybrid inverter working status. 2. if the fault still exists, contact us for help.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F42Fault

AC Line Low Voltage.

Fault

AC line low voltage - grid voltage fault.

CauseThe grid AC line voltage is below the standard voltage range in the specification.

Recommended fix1. Check that the AC voltage is in the range of the standard voltage in the specification. 2. Check whether the grid AC cables are firmly and correctly connected. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F47Fault

AC Overfrequency.

Fault

AC over frequency - grid frequency out of range (too high).

CauseThe grid frequency is above the range given in the specification.

Recommended fix1. Check whether the frequency is in the range of the specification. 2. Check whether the AC cables are firmly and correctly connected. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F48Fault

AC Underfrequency.

Fault

AC lower frequency - grid frequency out of range (too low).

CauseThe grid frequency is below the range given in the specification.

Recommended fix1. Check whether the frequency is in the range of the specification. 2. Check whether the AC cables are firmly and correctly connected. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F56Fault

DC Busbar Voltage Too Low.

Fault

DC busbar voltage is too low - battery voltage low.

CauseThe DC busbar voltage is too low because the battery voltage is too low.

Recommended fix1. Check whether the battery voltage is too low. 2. if the battery voltage is too low, use PV or grid to charge the battery. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F58Fault

BMS Communication Fault.

Fault

BMS communication fault - communication with the battery BMS has been lost.

CauseThe communication between the hybrid inverter and the battery BMS is disconnected while the 'BMS_Err-Stop' function is active.

Recommended fix1. if you do not want this to happen, disable the 'BMS_Err-Stop' item on the LCD. 2. if the fault still exists, contact us for help.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F63Fault

Arc Fault.

Fault

ARC fault - a PV DC arc fault was detected.

CauseAn electric arc was detected on the PV module cabling (ARC fault detection is only for the US market).

Recommended fix1. Check the PV module cable connection and clear the fault. 2. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

F64Fault

Heat Sink High Temperature.

Fault

Heat sink high temperature failure - the heat sink temperature is too high.

CauseThe heat sink temperature exceeded the limit; the working environment temperature may be too high.

Recommended fix1. Check whether the working environment temperature is too high. 2. Turn off the inverter for 10 minutes and restart. 3. Seek help from us if it cannot go back to the normal state.

Source:059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf· page 55

Still seeing a code on your SUN SG02LP2-US Hybrid?

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Common questions about SUN SG02LP2-US Hybrid error codes

What is the difference between a fault and a warning on the SUN SG02LP2-US Hybrid?
A fault cuts the unit's output and the red LED stays solid — this page lists 19 of them for the SUN SG02LP2-US Hybrid. The SUN SG02LP2-US Hybrid manual defines no separate warning table — every listed code stops operation. 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 SUN SG02LP2-US Hybrid shares its firmware and fault table with 5 other model numbers: SUN-5K-SG02LP2-US-AM2, SUN-6K-SG02LP2-US-AM2, SUN-7.6K-SG02LP2-US-AM2, SUN-8K-SG02LP2-US-AM2, SUN-10K-SG02LP2-US-AM3, SUN-12K-SG02LP2-US-AM3. 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 059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf — DEYE'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 DEYE user manuals. Always consult your device manual and a qualified technician before performing repairs.