What is the difference between a fault and a warning on the SUN LP1 Hybrid Series?

A fault cuts the unit's output and the red LED stays solid — this page lists 19 of them for the SUN LP1 Hybrid Series. The SUN LP1 Hybrid Series 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.

Where do these codes come from?

Every entry was transcribed from sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf, sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf, sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf, sun-3k-manual.pdf, sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf, sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf, sun-7.6-8k-sg01lp1-eu-20260625-en-manual.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.

DEYE SUN LP1 Hybrid Series Error Codes: Causes & Fixes (19 codes)

This is the complete fault table for the DEYE SUN LP1 Hybrid Series Inverter family — 19 codes shared by 29 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-3.6K-SG05LP1-EU-SM2-PSUN-5K-SG05LP1-EU-SM2-PSUN-6K-SG05LP1-EU-SM2-PSUN-7K-SG05LP1-EU-SM2-PSUN-7.6K-SG05LP1-EU-SM2-PSUN-8K-SG05LP1-EU-SM2-PSUN-10K-SG05LP1-EU-SM2-PSUN-7.6K-SG01LP1-EUSUN-8K-SG01LP1-EUSUN-12K-SG01LP1-EUSUN-14K-SG01LP1-EUSUN-16K-SG01LP1-EUSUN-5K-SG01LP1-USSUN-6K-SG01LP1-USSUN-7.6K-SG01LP1-USSUN-8K-SG01LP1-USSUN-3K-SG04LP1-24-EUSUN-3K-SG04LP1-EUSUN-3.6K-SG04LP1-EUSUN-5K-SG04LP1-EUSUN-6K-SG04LP1-EUSUN-3K-SG04LP1-24-EU-SM1SUN-3K-SG04LP1-EU-SM1SUN-3.6K-SG04LP1-EU-SM2SUN-5K-SG04LP1-EU-SM2SUN-6K-SG04LP1-EU-SM2SUN-3.6K-OG01LP1-EU-AM2SUN-5K-OG01LP1-EU-AM2SUN-6K-OG01LP1-EU-AM2

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

Fault(19)— output stops · red LED solid

Fault codes (19)output stops · red LED solid

F08

GFDI_Relay_Failure.

Fault

Ground fault detector/interrupter (GFDI) relay failure.

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 fixWhen the inverter is in a split-phase (120/240Vac) or three-phase (120/208Vac) system, connect the backup load port N line to ground. if the fault still exists, contact Deye for help.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 49sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 45sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 45sun-3k-manual.pdf· page 48sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 48sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 44sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 45

F13

Working mode change.

Fault

The inverter's working mode has changed; this fault normally clears automatically.

CauseReported when the grid type and frequency are changed, when the battery mode is changed to 'No battery' mode, or, on some old firmware versions, when the system work mode is changed.

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

F18

AC over current fault of hardware.

Fault

AC side over current fault detected by the hardware.

CauseThe backup load power or common load power is outside the allowed range, tripping the AC side hardware overcurrent protection.

Recommended fixCheck whether the backup load power and common load power are within the range, then restart and check whether operation is normal. Seek help from Deye if the inverter cannot go back to the normal state.

F20

DC over current fault of the hardware.

Fault

DC side over current fault detected by the hardware.

CauseA PV module or battery connection problem, or, in off-grid mode, the inverter starting up with a large load power.

Recommended fixCheck the PV module and battery connections. In off-grid mode, reduce the connected load power if the inverter starts up with big power of load. Turn off the DC switch and AC switch, wait one minute, then turn the DC/AC switches on again. Seek help from Deye if the inverter cannot go back to the normal state.

F22

Tz_EmergStop_Fault.

Fault

Emergency stop fault.

CauseAn emergency-stop (Tz_EmergStop) condition has been triggered in the inverter, stopping its operation.

Recommended fixContact your installer for help.

F23

AC leakage current is transient over current.

Fault

Leakage current fault: the AC leakage (residual) current is transiently over the limit.

CauseExcess leakage current on the AC side, typically from a poor PV side cable ground connection.

Recommended fixCheck the PV side cable ground connection and restart the system 2-3 times. if the fault still exists, contact Deye for help.

F24

DC insulation impedance failure.

Fault

PV isolation resistance is too low.

CauseThe PV panels are not firmly and correctly connected to the inverter, or the PE cable of the inverter is not connected to ground, so the measured PV insulation resistance is too low.

Recommended fixCheck that the connection of PV panels and inverter is firm and correct, and check whether the PE cable of the inverter is connected to ground. Seek help from Deye if the inverter cannot go back to the normal state.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 45sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 44sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F26

The DC busbar is unbalanced.

Fault

The DC busbar voltage is unbalanced.

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

Recommended fixWait for a while and check whether it returns to normal. In split-phase mode, balance the loads on L1 and L2. Restart the system 2-3 times. Seek help from Deye if the inverter cannot go back to the normal state.

F29

Parallel CANBus fault.

Fault

Parallel CAN bus communication fault.

CauseIn parallel mode, the parallel communication cable is badly connected or the inverter communication address is set incorrectly. Inverters also report F29 normally during the parallel system startup period until all units are ON.

Recommended fixCheck the parallel communication cable connection and the hybrid inverter communication address setting. During the parallel system startup period F29 is expected; when all inverters are in ON status it disappears automatically. if the fault still exists, contact Deye for help.

F34

AC Overcurrent fault.

Fault

AC overcurrent fault on the backup load output.

CauseThe connected backup load exceeds the allowed power range.

Recommended fixCheck the backup load connected and make sure it is in the allowed power range. if the fault still exists, contact Deye for help.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F35

No AC grid.

Fault

No utility: no AC grid is detected.

CauseThe grid supply is lost, the grid connection is bad, or the switch between the inverter and the grid is off.

Recommended fixConfirm whether the grid is lost, check that the grid connection is good, and check that the switch between the inverter and the grid is on. Seek help from Deye if the inverter cannot go back to the normal state.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F41

Parallel system stop.

Fault

The parallel system has stopped.

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

Recommended fixCheck the hybrid inverter working status: if one inverter is in OFF status, the other inverters may report F41 in the parallel system. if the fault still exists, contact Deye for help.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F42

AC line low voltage.

Fault

Grid voltage fault: the AC line voltage is out of the permitted range.

CauseThe grid AC voltage is outside the standard voltage range in the specification, or the grid AC cables are not firmly and correctly connected.

Recommended fixCheck that the AC voltage is in the range of the standard voltage in the specification and that the grid AC cables are firmly and correctly connected. Seek help from Deye if the inverter cannot go back to the normal state.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F47

AC over frequency.

Fault

Grid frequency out of range: the AC frequency is too high.

CauseThe grid frequency is above the range in the specification, or the AC cables are not firmly and correctly connected.

Recommended fixCheck that the frequency is in the range of the specification and that the AC cables are firmly and correctly connected. Seek help from Deye if the inverter cannot go back to the normal state.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F48

AC lower frequency.

Fault

Grid frequency out of range: the AC frequency is too low.

CauseThe grid frequency is below the range in the specification, or the AC cables are not firmly and correctly connected.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F56

DC busbar voltage is too low.

Fault

Battery voltage low: the DC busbar voltage is too low.

CauseThe battery voltage is too low.

Recommended fixCheck whether the battery voltage is too low; if it is, use PV or grid power to charge the battery. Seek help from Deye if the inverter cannot go back to the normal state.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 50sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 46sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 49sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 49sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 46

F58

BMS communication fault.

Fault

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

CauseThe communication link between the hybrid inverter and the battery BMS has been lost while the 'BMS_Err-Stop' setting is enabled.

Recommended fixRestore the communication between the inverter and the battery BMS. if you do not want this fault reported, you can disable the 'BMS_Err-Stop' item on the LCD. if the fault still exists, contact Deye for help.

Source:sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf· page 51sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf· page 47sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf· page 46sun-3k-manual.pdf· page 50sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf· page 50sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf· page 45sun-7.6-8k-sg01lp1-eu-20260625-en-manual.pdf· page 47

F63

ARC fault.

Fault

PV arc fault detected (AFCI). ARC fault detection is only for the US market.

CauseDC arcing detected on the PV side, typically from a bad PV module cable connection.

Recommended fixCheck the PV module cable connection and clear the fault. Seek help from Deye if the inverter cannot go back to the normal state.

F64

Heat sink high temperature failure.

Fault

The heat sink temperature is too high.

CauseThe working environment temperature is too high, causing the inverter heat sink to overheat.

Recommended fixCheck whether the work environment temperature is too high. Turn off the inverter for 10 minutes and restart. Seek help from Deye if the inverter cannot go back to the normal state.

Still seeing a code on your SUN LP1 Hybrid Series?

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

Message a technician on WhatsApp Call +97142550887 or use the contact form

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Common questions about SUN LP1 Hybrid Series error codes

What is the difference between a fault and a warning on the SUN LP1 Hybrid Series?: A fault cuts the unit's output and the red LED stays solid — this page lists 19 of them for the SUN LP1 Hybrid Series. The SUN LP1 Hybrid Series 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 LP1 Hybrid Series shares its firmware and fault table with 28 other model numbers: SUN-3.6K-SG05LP1-EU-SM2-P, SUN-5K-SG05LP1-EU-SM2-P, SUN-6K-SG05LP1-EU-SM2-P, SUN-7K-SG05LP1-EU-SM2-P, SUN-7.6K-SG05LP1-EU-SM2-P, SUN-8K-SG05LP1-EU-SM2-P, SUN-10K-SG05LP1-EU-SM2-P, SUN-7.6K-SG01LP1-EU, SUN-8K-SG01LP1-EU, SUN-12K-SG01LP1-EU, SUN-14K-SG01LP1-EU, SUN-16K-SG01LP1-EU, SUN-5K-SG01LP1-US, SUN-6K-SG01LP1-US, SUN-7.6K-SG01LP1-US, SUN-8K-SG01LP1-US, SUN-3K-SG04LP1-24-EU, SUN-3K-SG04LP1-EU, SUN-3.6K-SG04LP1-EU, SUN-5K-SG04LP1-EU, SUN-6K-SG04LP1-EU, SUN-3K-SG04LP1-24-EU-SM1, SUN-3K-SG04LP1-EU-SM1, SUN-3.6K-SG04LP1-EU-SM2, SUN-5K-SG04LP1-EU-SM2, SUN-6K-SG04LP1-EU-SM2, SUN-3.6K-OG01LP1-EU-AM2, SUN-5K-OG01LP1-EU-AM2, SUN-6K-OG01LP1-EU-AM2. 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 sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf, sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf, sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf, sun-3k-manual.pdf, sun-3-3.6-5-6k-sg04lp1-eu-sm1-sm2-20260428-en-manual.pdf, sun-5-6-7.6-8k-sg01lp1-us-20260406-en-manual.pdf, sun-7.6-8k-sg01lp1-eu-20260625-en-manual.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.

How to read the severity labels

Fault codes (19)output stops · red LED solid

GFDI_Relay_Failure.

Working mode change.

AC over current fault of hardware.

DC over current fault of the hardware.

Tz_EmergStop_Fault.

AC leakage current is transient over current.

DC insulation impedance failure.

The DC busbar is unbalanced.

Parallel CANBus fault.

AC Overcurrent fault.

No AC grid.

Parallel system stop.

AC line low voltage.

AC over frequency.

AC lower frequency.

DC busbar voltage is too low.

BMS communication fault.

ARC fault.

Heat sink high temperature failure.

Still seeing a code on your SUN LP1 Hybrid Series?

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Common questions about SUN LP1 Hybrid Series error codes