This is the complete fault table for the DEYE SUN G01P3-EU-BM8 Series Inverter family — 68 codes shared by 5 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.
Last checked against the official manuals on July 11, 2026.
The DC input from the PV strings is connected with reversed polarity.
CauseThe plus and minus conductors of a PV string are swapped at the inverter's DC input, so the inverter sees reverse polarity.
Recommended fixCheck the PV input polarity.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The insulation impedance between the DC (PV) side and ground is permanently below the protection limit.
CauseA defective or missing inverter ground connection, or degraded DC-side insulation, keeps the measured insulation impedance to ground below the limit.
Recommended fixCheck the grounding cable of the inverter.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Leakage current on the DC side exceeds the protection limit. The manual notes this code has hardly ever appeared in the field.
CauseLeakage current from the DC side to ground exceeds the protection threshold, typically caused by damaged PV cable or module insulation.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The ground-fault detector/interrupter (GFDI) has detected a ground fault on the PV side.
CauseA PV output conductor is faulted to ground, tripping the GFDI protection.
Recommended fixCheck the solar panel output connection.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Failure in reading the internal memory (EEPROM).
CauseThe controller failed to read stored data from the EEPROM memory chip.
Recommended fixRestart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Failure in writing the internal memory (EEPROM).
CauseThe controller failed to write data to the EEPROM memory chip.
Recommended fixRestart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The GFDI protection fuse has blown. The manual notes this code has hardly ever appeared in the field.
CauseThe ground-fault detector/interrupter fuse has blown, which points to a ground-fault current having flowed on the PV side.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The GFDI circuit reports a failed grounding contact. The manual notes this code has hardly ever appeared in the field.
CauseThe GFDI circuit detected a failed ground contact, so the ground-fault protection path is not intact.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
An IGBT power switch shows an excessive voltage drop. The manual notes this code has hardly ever appeared in the field.
CauseAn IGBT power switch exhibits an excessive on-state voltage drop, indicating the switch has been damaged.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The internal auxiliary switching power supply has failed; the DC 12 V rail is missing.
CauseThe internal DC 12 V auxiliary supply is not present (the manual: 'It tells the DC 12V is not existed').
Recommended fixRestart the inverter; if the fault still exists, please contact your installer.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The main AC contactor did not operate correctly. The manual notes this code has hardly ever appeared in the field.
CauseThe main AC contactor failed to switch as commanded or returned an implausible feedback state.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The auxiliary AC contactor did not operate correctly. The manual notes this code has hardly ever appeared in the field.
CauseThe auxiliary AC contactor failed to switch as commanded or returned an implausible feedback state.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Reserved code; in practice it is raised when a grid phase is lost or the AC voltage detection/relays do not close.
CauseLoss of one grid phase, a failure in the AC voltage detection part, or relays that did not close.
Recommended fixRestart the inverter; if the error still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Firmware-level DC over-current protection tripped. The manual notes this code has hardly ever appeared in the field.
CauseThe DC input current exceeded the firmware (software) over-current limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Firmware-level AC over-current protection tripped.
CauseThe AC output current exceeded the firmware limit; the internal AC sensor, its detection circuit on the control board, or a connection wire may be loose.
Recommended fix1. Check the internal AC sensor, its detection circuit on the control board and the connection wiring. 2. Restart the inverter; if the error still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The GFCI/RCD stage measured an average AC leakage current above 300 mA.
CauseThe average AC leakage current measured by the GFCI/RCD stage exceeds 300 mA, from a real leakage path on the DC supply or solar panels or from a faulty leakage current sensor or its circuit.
Recommended fix1. Check whether the DC power supply and the solar panels are OK, then check that the 'Test data' -> 'diL' value is about 40, then check the leakage current sensor and its circuit (viewing test data requires the big LCD). 2. Restart the inverter; if the error still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
The three-phase output current exceeded the over-current protection limit. The manual notes this code has hardly ever appeared in the field.
CauseThe summed three-phase output current exceeded the over-current protection limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Hardware-level AC over-current protection tripped.
CauseThe AC output current exceeded the hardware protection limit; the AC sensor or its detection circuit on the control board, or the connection wiring, may be faulty.
Recommended fix1. Check the AC sensor and its detection circuit on the control board and the connection wiring. 2. Restart the inverter or perform a factory reset; if the error still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Aggregate flag raised when hardware protection faults occur in combination. The manual notes this code has hardly ever appeared in the field.
CauseSeveral hardware protection signals tripped together; the inverter raises this synthesized (aggregate) hardware-failure flag.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Hardware-level DC over-current protection tripped.
CauseThe DC input current exceeded the hardware protection limit: solar panel output current above the allowed range, a DC current sensor or detection-circuit fault, or firmware that does not match the hardware.
Recommended fix1. Check whether the solar panel output current is within the allowed range. 2. Check the DC current sensor and its detection circuit. 3. Check that the inverter firmware version is suitable for the hardware. 4. Restart the inverter; if the error still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 61
Leakage current in the DC circuit exceeded the protection threshold. The manual notes this code has hardly ever appeared in the field.
CauseLeakage current in the DC circuit exceeded the protection threshold.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The inverter performed a crash (emergency) stop.
CauseThe external stop button (where fitted) was activated, forcing the inverter to stop immediately.
Recommended fixContact your installer for help.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The AC leakage current rose above 30 mA suddenly.
CauseThe leakage current jumped above 30 mA suddenly, from a real transient leakage path on the DC supply or solar panels or from a faulty leakage current sensor or its circuit.
Recommended fix1. Check whether the DC power supply and the solar panels are OK, then check that the 'Test data' -> 'diL' value is about 40, then check the leakage current sensor and its circuit (checking test data requires the big LCD). 2. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The PV-array-to-ground insulation impedance is too low.
CauseThe insulation impedance between the PV array and ground is too low: often a PV panel problem, poor grounding of the PV panel frames or of the inverter, or an AC/DC cable or terminal block shorted to ground or with damaged insulation.
Recommended fix1. Check the Vpe resistance on the main board and its detection on the control board, and check that the PV panels are OK - many times this issue is a PV problem. 2. Check that the PV panel aluminium frames and the inverter are grounded well; open the inverter cover and check that the inside ground cable is fixed well on the shell. 3. Check whether an AC/DC cable or terminal block is shorted to ground or has damaged insulation. 4. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
Current was detected feeding back into the DC side. The manual notes this code has hardly ever appeared in the field.
CauseCurrent was detected flowing back into the DC side (DC feedback/backfeed).
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The voltages on the two halves of the DC bus are unbalanced.
CauseThe DC bus half-voltages are unbalanced; the 'BUSN' cable or the driver-board power supply cable may be loose.
Recommended fix1. Check whether the 'BUSN' cable or the driver-board power supply cable is loose. 2. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
An insulation error was detected at the DC end. The manual notes this code has hardly ever appeared in the field.
CauseThe insulation at the DC end of the power stage fell below the acceptable level.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The DC component on inverter bridge 1 is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC component measured on inverter bridge 1 is too high.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The AC load switch failed. The manual notes this code has hardly ever appeared in the field.
CauseThe AC load switch failed to operate correctly.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The main AC relay/contactor failed to operate.
CauseThe main AC relay failed to close correctly: a relay fault, a relay driver circuit fault, or software that is not suitable for this inverter (old inverters have no relay detection function).
Recommended fix1. Check the relays and the AC voltage of the relays. 2. Check the relay driver circuit. 3. Check if the software is not suitable for this inverter (old inverters have no relay detection function). 4. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
At least one AC relay cannot close.
CauseAt least one relay cannot be closed - a relay fault or a faulty relay driver signal (old inverters have no relay detection function).
Recommended fix1. Check the relays and their driver signals. 2. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The DC component on inverter bridge 2 is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC component measured on inverter bridge 2 is too high.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The AC output current exceeded the over-current protection limit. The manual notes this code has hardly ever appeared in the field.
CauseThe AC output current exceeded the over-current protection limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The AC output current stayed above the rated level (overload). The manual notes this code has hardly ever appeared in the field.
CauseThe AC output current stayed above the rated level long enough to trip the overload protection.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
No grid voltage is detected.
CauseNo AC grid voltage is present at the inverter: a grid outage, a bad AC connector or cable, or a fault in the AC voltage detection circuit.
Recommended fix1. Check the AC grid voltage and the AC voltage detection circuit; check that the AC connector is in good condition and that the AC grid is normal in voltage. 2. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
A grid phase error was detected. The manual notes this code has hardly ever appeared in the field.
CauseThe grid phase sequence or phase angle is wrong, or a phase reference was lost.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The three grid phase voltages are unbalanced. The manual notes this code has hardly ever appeared in the field.
CauseThe three grid phase voltages are unbalanced beyond the allowed range.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
The three output phase currents are unbalanced. The manual notes this code has hardly ever appeared in the field.
CauseThe three output phase currents are unbalanced beyond the allowed range.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 62
AC over-current detected within one grid cycle.
CauseThe AC output current exceeded the limit within a single grid cycle; the AC current sensor or its circuit may be faulty.
Recommended fix1. Check the AC current sensor and its circuit. 2. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC input current exceeded the over-current protection limit. The manual notes this code has hardly ever appeared in the field.
CauseThe DC input current exceeded the over-current protection limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The W-U line voltage is above the protection setting.
CauseThe line voltage between phases W and U exceeds the protection setting; an AC cable that is too thin raises the voltage at the inverter terminals under feed-in.
Recommended fixCheck the AC voltage protection setting, and check if the AC cable is too thin. Check the voltage difference between the LCD and a meter.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The W-U line voltage is below the protection setting.
CauseThe line voltage between phases W and U is below the protection setting; loose or incorrectly connected AC cables can cause the low reading.
Recommended fixCheck the AC voltage protection setting. Check the voltage difference between the LCD and a meter, and check whether all AC cables are firmly and correctly connected.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The V-W line voltage is above the protection setting.
CauseThe line voltage between phases V and W exceeds the protection setting; an AC cable that is too thin raises the voltage at the inverter terminals under feed-in.
Recommended fixCheck the AC voltage protection setting, and check if the AC cable is too thin. Check the voltage difference between the LCD and a meter.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The V-W line voltage is below the protection setting.
CauseThe line voltage between phases V and W is below the protection setting; loose or incorrectly connected AC cables can cause the low reading.
Recommended fixCheck the AC voltage protection setting. Check the voltage difference between the LCD and a meter, and check whether all AC cables are firmly and correctly connected.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The U-V line voltage is above the protection setting.
CauseThe line voltage between phases U and V exceeds the protection setting; an AC cable that is too thin raises the voltage at the inverter terminals under feed-in.
Recommended fixCheck the AC voltage protection setting, and check if the AC cable is too thin. Check the voltage difference between the LCD and a meter.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The U-V line voltage is below the protection setting.
CauseThe line voltage between phases U and V is below the protection setting.
Recommended fixCheck the AC voltage protection setting.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The grid frequency is above the protection setting.
CauseThe measured grid frequency is above the configured protection limit.
Recommended fixCheck the frequency protection setting.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The grid frequency is below the protection setting.
CauseThe measured grid frequency is below the configured protection limit.
Recommended fixCheck the frequency protection setting.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC component of the U-phase grid current is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC component of the U-phase grid current exceeds the allowed limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC component of the V-phase grid current is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC component of the V-phase grid current exceeds the allowed limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC component of the W-phase grid current is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC component of the W-phase grid current exceeds the allowed limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC current through AC filter inductor phase A is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC current component through AC filter inductor phase A exceeds the allowed limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC current through AC filter inductor phase B is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC current component through AC filter inductor phase B exceeds the allowed limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC current through AC filter inductor phase C is too high. The manual notes this code has hardly ever appeared in the field.
CauseThe DC current component through AC filter inductor phase C exceeds the allowed limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC bus voltage is above the limit.
CauseThe DC bus (Ubus) voltage is above the limit - usually the PV input voltage is too high because too many solar panels are connected in series, or the Ubus detection circuit is faulty.
Recommended fix1. Check the PV voltage and the Ubus voltage and their detection circuit; if the PV input voltage exceeds the limit, reduce the number of solar panels in series. 2. For the Ubus voltage, check the LCD display.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
The DC bus voltage is below the limit.
CauseThe PV input voltage is low - it always happens in the early morning; if F56 appears while the inverter is running, a loss of the driver or firmware that needs updating may be responsible.
Recommended fix1. Check the PV voltage and the Ubus voltage - in the early morning this normally just reflects low PV input voltage. 2. if it shows while the inverter is running, the driver may have been lost or the firmware may need updating. 3. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
Reverse power flow into the AC grid was detected ('AC reverse irrigation', i.e. reverse feed-in).
CausePower is flowing back into the AC grid beyond what the configuration allows, so the inverter flags reverse feed-in (the manual's remedy column simply restates 'AC reverse irrigation').
Recommended fixIf export to the grid is not intended, check the zero-export/limiter settings and the meter or sensor-clamp installation; restart the inverter and contact your installer if the fault persists.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
Over-current on grid phase U. The manual notes this code has hardly ever appeared in the field.
CauseThe grid current on phase U exceeded the over-current limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 63
Over-current on grid phase V. The manual notes this code has hardly ever appeared in the field.
CauseThe grid current on phase V exceeded the over-current limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 64
Over-current on grid phase W. The manual notes this code has hardly ever appeared in the field.
CauseThe grid current on phase W exceeded the over-current limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 64
Over-current through filter reactor phase A. The manual notes this code has hardly ever appeared in the field.
CauseThe current through filter reactor phase A exceeded the over-current limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 64
Over-current through filter reactor phase B. The manual notes this code has hardly ever appeared in the field.
CauseThe current through filter reactor phase B exceeded the over-current limit.
Recommended fixRestart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 64
A DC arc was detected on the PV side.
CauseA DC arc was detected in the PV module cabling (arc-fault protection), usually at a loose or degraded PV cable connection.
Recommended fix1. Check the PV module cable connection and clear the fault. 2. Seek help from Deye if the inverter cannot go back to the normal state.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 64
The IGBT heat-sink temperature is too high.
CauseThe IGBT heat-sink temperature exceeded the limit - inadequate cooling or high ambient temperature, or a temperature sensor fault, unsuitable firmware, or a wrong model configuration producing a false reading.
Recommended fix1. Check the temperature sensor; check that the firmware is suitable for the hardware and that the inverter is its right model. 2. Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 64
An arc issue was detected on the PV side of the inverter.
CauseAn electrical arc has formed on the PV side, usually at a poor or loose PV string connection.
Recommended fixCheck the connection of the PV, then clear the fault through the ARC function in the operating parameters; the inverter can then resume operation.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 60
The firmware was upgraded incorrectly.
CauseThe firmware was upgraded incorrectly (a wrong or failed firmware package was loaded).
Recommended fixUpgrade to the correct firmware.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 60
A cooling fan is not working.
CauseOne or more fan cables are not properly connected, or a fan is broken.
Recommended fixCheck whether all fan cables are properly connected, or replace the faulty fan.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 60
A firmware version (prefix) error occurred during upgrade.
CauseA version error occurred during a firmware upgrade, leaving the inverter with a mismatched firmware version prefix.
Recommended fixContact an after-sales engineer to send the command that fixes the version error.
Source:041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf· page 60
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.
Compiled from official DEYE user manuals. Always consult your device manual and a qualified technician before performing repairs.