What is the difference between a fault and a warning on the GB-A HV Battery?

A fault puts the unit into protection and stops normal operation — this page lists 53 of them for the GB-A HV Battery. A warning leaves the unit running; there are 2 warning codes here. Resolve the cause of a fault before restarting; warnings can usually be cleared while the unit runs.

Does this page apply to other DEYE models?

No — this table was transcribed specifically from the GB-A HV Battery manual. Other DEYE devices have their own pages; start from the error-code hub to find the one matching the model number on your unit's label.

Where do these codes come from?

Every entry was transcribed from 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.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 GB-A HV Battery Error Codes: Causes & Fixes (55 codes)

This is the complete fault table for the DEYE GB-A HV Battery Battery — all 55 codes from the official manual on one page. On this DEYE device, a fault code means the unit has entered protection and stopped normal operation; a warning leaves it running. The exact indication (LED pattern or display code) is listed per code below.

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

Fault(53)— operation stops until cleared
Warning(2)— unit keeps running · needs attention

Fault codes (53)operation stops until cleared

F001

ALARM_ID_SUM_OVER_VOLT_LEV_2.

Fault

Total battery (pack) voltage too high - level-2 protection (manual wording: 'the total pressure is too high').

CausePack voltage exceeded the level-2 over-voltage limit - the PCS charge voltage is set too high for the battery bank, or charging failed to taper near full.

Recommended fixStop charging and correct the PCS charge-voltage settings for the battery configuration. if the fault does not clear after the voltage falls, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F002

ALARM_ID_SUM_LOW_VOLT_LEV_2.

Fault

Total battery (pack) voltage too low - level-2 protection.

CauseThe pack was over-discharged below the level-2 under-voltage limit - sustained discharge without recharging, or long storage self-discharge.

Recommended fixStop discharging and recharge the battery promptly from PV or grid. if it will not recover, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F003

ALARM_ID_CHG_OVER_TEMP_LEV_2.

Fault

Charging temperature is too high.

CauseCell temperature exceeded the charging over-temperature limit - high ambient temperature, poor ventilation, or sustained high charge current.

Recommended fixStop charging and let the battery cool; improve ventilation and keep the battery within its rated charge temperature range.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F004

ALARM_ID_DSG_OVER_TEMP_LEV_2.

Fault

Discharging temperature is too high.

CauseCell temperature exceeded the discharging over-temperature limit - high load current, high ambient temperature, or poor ventilation.

Recommended fixReduce the load and let the battery cool; improve ventilation before resuming operation.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F005

ALARM_ID_CHG_LOW_TEMP_LEV_2.

Fault

The charging temperature is too low.

CauseCell temperature is below the minimum charging temperature - the battery is in an environment colder than its rated charging window.

Recommended fixWarm the installation space (or allow the internal heating to bring the cells up to temperature) before charging resumes.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F006

ALARM_ID_DSG_LOW_TEMP_LEV_2.

Fault

The discharge temperature is too low.

CauseCell temperature is below the minimum discharging temperature - the battery environment is colder than the rated discharge window.

Recommended fixWarm the installation space and wait for the cells to return to the operating temperature range.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F007

ALARM_ID_OVER_DIFF_VOLT_LEV_2.

Fault

Excessive voltage differences between cells/modules (manual wording: 'excessive pressure differences').

CauseThe voltage gap between the highest and lowest cell or module exceeded the level-2 threshold - cell imbalance from aging, long storage, or a weak module.

Recommended fixCharge the bank fully at low current so the BMS can balance the cells. if the difference does not close after several full charges, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F008

ALARM_ID_OVER_DIFF_TEMP_LEV_2.

Fault

Excessive temperature differences across the pack.

CauseThe temperature gap between measurement points exceeded the level-2 threshold - uneven heating/cooling of the cabinet or a drifting sensor.

Recommended fixCheck the battery is evenly ventilated and not partially exposed to a heat source; let temperatures equalize. if the code returns, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 12

F009

ALARM_ID_CELL_OVER_VOLT_LEV_2.

Fault

Cell overvoltage.

CauseA single cell exceeded the level-2 over-voltage limit during charging - charge voltage too high or cell imbalance.

Recommended fixStop charging and check the PCS charge-voltage settings; allow the BMS to balance the cells with a low-current full charge. Contact Deye support if it recurs.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F010

ALARM_ID_CELL_LOW_VOLT_LEV_2.

Fault

Cell undervoltage.

CauseA single cell fell below the level-2 under-voltage limit - over-discharge or a weak cell.

Recommended fixRecharge the battery promptly. if the same cell keeps triggering the fault, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F011

ALARM_ID_PRE_CHG_RES_OVER_TEMP_LEV_2.

Fault

The temperature of the precharge resistance is too high.

CauseRepeated or prolonged precharge attempts - typically into a bus short or an oversized capacitive load - overheated the precharge resistor.

Recommended fixSwitch off and let the unit cool; check the DC bus and PCS side for shorts or abnormal loading before restarting. Contact Deye support if it recurs.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F012

ALARM_ID_NORTH_CONNECTOR_OVER_TEMP_LEV_2.

Fault

The temperature of the BMS connector is too high.

CauseA loose or high-resistance connection at the BMS power connector heated up under current.

Recommended fixSwitch off, let it cool, and check/re-seat and torque the BMS connector and cabling. Contact Deye support if the heating returns.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F013

ALARM_ID_SOUTH_CONNECTOR_OVER_TEMP_LEV_2.

Fault

The temperature of the BMU connector is too high.

CauseA loose or high-resistance connection at the BMU power connector heated up under current.

Recommended fixSwitch off, let it cool, and check/re-seat and torque the BMU connector and cabling. Contact Deye support if the heating returns.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F014

ALARM_ID_CHG_OVER_CUR_LEV_2.

Fault

Charging current fault.

CauseCharging current exceeded the level-2 limit - the PCS charge-current setting is above the battery rating or current sharing between racks is uneven.

Recommended fixReduce the PCS charge-current setting to the battery's rating and check rack cabling for symmetry, then restart.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F015

ALARM_ID_DSG_OVER_CUR_LEV_2.

Fault

Discharge current fault.

CauseDischarge current exceeded the level-2 limit - the load or PCS demand is above the battery's rated discharge current.

Recommended fixReduce the load or the PCS discharge-current limit, then restart. Contact Deye support if it recurs within rating.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F016

ALARM_ID_SOC_OVER_LEV_2.

Fault

High SOC fault.

CauseThe state of charge rose above the allowed upper limit - charging continued past full, usually from wrong charge settings or SOC drift.

Recommended fixStop charging and let the battery discharge slightly; check the PCS charge cut-off settings. Contact Deye support if the SOC reading looks wrong.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F017

ALARM_ID_INSULATION_FAILURE_TWO.

Fault

Insulation fault.

CauseInsulation resistance between the high-voltage circuit and ground is below the limit - moisture ingress, damaged cable insulation, or a pinched conductor.

Recommended fixSwitch off. Inspect and dry the HV cabling and connectors, and repair any damaged insulation. Contact Deye support before re-energizing if the fault persists.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F018

ALARM_ID_HEAT_OVER_TEMP_LEV_2.

Fault

The heating film temperature is too high.

CauseThe self-heating film exceeded its temperature limit - heating stayed on too long or its sensor is misreading.

Recommended fixSwitch off and let the system cool. if the fault returns when heating engages, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F019

ALARM_ID_SOC_LOW_LEV_2.

Fault

The SOC is too low.

CauseState of charge fell below the allowed lower limit - the battery was discharged without timely recharging.

Recommended fixRecharge the battery promptly from PV or grid; check the PCS discharge cut-off settings so the bank is not run this low again.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F020

ALARM_ID_DSG_RELAY_ADHESION.

Fault

Discharge relay adhesion (the manual's description column here reads 'the total voltage is too low'; the alarm ID identifies stuck discharge-relay contacts).

CauseThe BMS self-test found the discharge relay contacts stuck (welded) closed, so the discharge path can no longer be opened.

Recommended fixSwitch the battery off and take it out of service; the relay must be serviced. Contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F021

ALARM_ID_POS_RELAY_ADHESION.

Fault

Total positive relay bonding (main positive relay contacts stuck).

CauseThe main positive relay contacts are welded closed, so the pack cannot be disconnected on the positive path.

Recommended fixSwitch the battery off and take it out of service; contact Deye support for relay service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F022

ALARM_ID_CHG_RELAY_ADHESION.

Fault

The charging relay contacts are stuck ('glued').

CauseThe charge relay contacts are welded closed, so the charge path can no longer be opened.

Recommended fixSwitch the battery off and take it out of service; contact Deye support for relay service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F023

ALARM_ID_HEAT_RELAY_ADHESION.

Fault

The heating relay contacts are stuck ('glued').

CauseThe heating relay contacts are welded closed, so the heating film can no longer be switched off reliably.

Recommended fixSwitch the battery off to prevent uncontrolled heating and contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F024

ALARM_ID_ULTIMATE_PROTECTION.

Fault

Ultimate protection.

CauseA critical parameter passed the final protection threshold, beyond the normal recoverable protection levels.

Recommended fixSwitch the battery off and disconnect it; do not keep operating it. Contact Deye support before returning it to service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F025

ALARM_ID_POWER_SUPPLY_FAULT.

Fault

Abnormal supply voltage.

CauseThe BMS auxiliary power-supply voltage is out of range - a fault in the internal supply or its source.

Recommended fixRestart the system. if the fault persists, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F026

ALARM_ID_FUSE_BLOWN.

Fault

Blown fuse.

CauseThe main pack fuse opened - an external short circuit or an extreme over-current event.

Recommended fixTake the battery out of service and contact Deye support; the cause of the over-current must be found and cleared before the fuse is replaced.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F027

ALARM_ID_BMU_ADDR_REPEAT.

Fault

Duplicate BMU address (the manual's description column reads 'the BMU repeatedly fails'; the alarm ID identifies a repeated BMU address).

CauseTwo battery modules (BMUs) are configured with the same address on the internal bus.

Recommended fixCorrect the module addressing so every BMU has a unique address, then power-cycle the system. Contact Deye support if addresses cannot be changed on site.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F028

ALARM_ID_BMS_ADDR_REPEAT.

Fault

Duplicate BMS address (manual description: 'the BMS is faulty repeatedly'; the alarm ID identifies a repeated BMS address).

CauseTwo BMS units in the system are configured with the same address on the communication bus.

Recommended fixAssign a unique address to each BMS per the parallel/rack instructions and power-cycle the system.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F029

ALARM_ID_INTERNAL_COMM_ERROR.

Fault

The internal CAN communication fails.

CauseThe internal CAN bus between BMS components dropped - loose internal wiring or a board fault.

Recommended fixRestart the system. if the fault persists, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F030

ALARM_ID_PCS_CAN_COMM_FAIL.

Fault

The PCS CAN communication fails.

CauseThe CAN link between the battery COM port and the PCS dropped - loose or miswired cable, wrong pinout, or wrong protocol selection on the PCS.

Recommended fixCheck the communication cable and pin assignment between the battery COM port and the PCS, and verify the PCS battery-protocol setting. Restart both units.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F031

MBMS_SAM_SIG_ID_PCS_ERROR_STATE.

Fault

The PCS RS485 communication fails (PCS error state signal).

CauseThe battery stopped receiving valid RS485 communication from the PCS, or the PCS is signalling an error state.

Recommended fixCheck the RS485 cable and pinout to the PCS and clear any fault on the PCS side, then restart. Contact Deye support if it persists.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 13

F032

ALARM_ID_PCS_RS485_COMM_ERROR.

Fault

The PCS RS485 communication is abnormal.

CauseThe RS485 link between battery and PCS is delivering corrupted or intermittent data - wiring, termination, or interface fault.

Recommended fixCheck the RS485 cabling, pin order and terminations between battery and PCS; restart both units. Contact Deye support if it persists.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F033

ALARM_ID_FUSE_VOLT_SAMP_ERROR.

Fault

The fuse total-voltage sampling is abnormal (manual wording: 'the FUSE total pressure collection is abnormal').

CauseThe voltage measurement across the main fuse returned an invalid reading - a sampling-circuit fault or a degraded fuse connection.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F034

ALARM_ID_BAT_VOLT_SAMP_ERROR.

Fault

Abnormal internal total-voltage sampling.

CauseThe internal pack total-voltage measurement returned an invalid reading - a sampling-circuit or harness fault.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F035

ALARM_ID_MOT_VOLT_SAMP_ERROR.

Fault

The MOT total-voltage sampling is abnormal.

CauseThe voltage measurement on the MOT (output-side) sampling point returned an invalid reading - a sampling-circuit fault.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F036

ALARM_ID_HTP_VOLT_SAMP_ERROR.

Fault

The heating-circuit total-voltage sampling is abnormal.

CauseThe voltage measurement on the heating circuit returned an invalid reading - a sampling-circuit fault.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F037

ALARM_ID_CELL_VOLT_SAMPLE_ERROR.

Fault

Voltage collection fault (cell-voltage sampling).

CauseThe cell-voltage sampling circuit or harness returned invalid readings.

Recommended fixRestart the system. if the fault persists, the sampling circuit needs service - contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F038

ALARM_ID_TEMP_SAMPLE_ERROR.

Fault

Temperature acquisition fault.

CauseA temperature sensor is open, shorted, or disconnected, so the BMS cannot read a valid temperature.

Recommended fixRestart the system. if the fault persists, contact Deye support for sensor service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F039

ALARM_ID_CURRENT_SAMPLE_ERROR.

Fault

Current acquisition fault.

CauseThe current measurement returned an invalid reading - a fault in the current sensor or its sampling circuit.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F040

ALARM_ID_CURRENT_MODULE_FAULT.

Fault

Current module fault.

CauseThe current-measurement module (shunt/Hall sensor module) failed its self-check.

Recommended fixRestart the system. if the fault persists, contact Deye support for module replacement.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F041

ALARM_ID_POS_RELAY_DRIVE_FAULT.

Fault

Total positive relay drive failure.

CauseThe drive circuit for the main positive relay failed - the relay coil or its driver cannot actuate the relay.

Recommended fixRestart the system. if the fault persists, the relay drive circuit needs service - contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F042

ALARM_ID_CHG_RELAY_DRIVE_FAULT.

Fault

Charging relay drive failure.

CauseThe drive circuit for the charge relay failed - the relay cannot be actuated.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F043

ALARM_ID_DSG_RELAY_DRIVE_FAULT.

Fault

Discharge relay drive failure.

CauseThe drive circuit for the discharge relay failed - the relay cannot be actuated.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F044

ALARM_ID_HEAT_RELAY_DRIVE_FAULT.

Fault

Heating relay drive failure.

CauseThe drive circuit for the heating relay failed - heating cannot be switched as commanded.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F045

ALARM_ID_EEPROM_ERROR.

Fault

The EEPROM storage is faulty.

CauseThe BMS could not read or write its non-volatile memory holding calibration and configuration.

Recommended fixRestart the system. if the fault persists, contact Deye support for BMS repair or replacement.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F046

ALARM_ID_PRECHAGE_ERROR.

Fault

The precharge failed.

CauseThe precharge circuit could not raise the bus voltage - a short or very large capacitive load on the DC bus, or a failed precharge resistor.

Recommended fixDisconnect and check the DC bus and PCS side for shorts, then restart. if precharge still fails, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F047

ALARM_ID_CHG_VOLT_LOW.

Fault

The charging voltage is too low.

CauseThe voltage supplied by the charger/PCS is below what the pack needs to charge - wrong PCS charge settings or a sagging DC bus.

Recommended fixCheck and correct the PCS charge-voltage settings for this battery configuration, then restart charging.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F048

ALARM_ID_BMU_COMM_ERROR.

Fault

The BMU communication is faulty.

CauseThe internal bus between the BMS and one or more battery modules (BMUs) dropped - module wiring or a module board fault.

Recommended fixCheck the inter-module communication cabling and restart the system. if the fault persists, contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F049

ALARM_ID_BMU_NUMBER_ERROR.

Fault

The number of BMUs is abnormal.

CauseThe number of battery modules detected on the bus does not match the configured system - a module is offline or the configuration is wrong.

Recommended fixCheck that all modules are powered and their communication cabling is intact; verify the configured module count. Restart the system.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F050

ALARM_ID_MBMS_NTC_BREAKLINE_ERROR.

Fault

Temperature collection of the BMS connector is abnormal (NTC open circuit).

CauseThe NTC temperature sensor line on the BMS connector is broken or disconnected.

Recommended fixRestart the system. if the fault persists, the sensor line needs service - contact Deye support.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F051

ALARM_ID_BMU_NTC_BREAKLINE_ERROR.

Fault

The temperature collection of the BMU connector is abnormal (NTC open circuit).

CauseThe NTC temperature sensor line on a BMU connector is broken or disconnected.

Recommended fixRestart the system. if the fault persists, contact Deye support for service.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F052

ALARM_ID_PACK_THERMAL_RUNAWAY.

Fault

PACK thermal runaway fault.

CauseThe BMS detected cell behaviour consistent with thermal runaway - rapidly rising temperature that the protections cannot stop.

Recommended fixTreat as an emergency: keep people away from the battery, do not attempt to operate or open it, ventilate the area, and follow the fire-safety procedure. Contact emergency services if there is smoke or fire, and contact Deye support before any re-use.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F053

ALARM_ID_PACK_FIRE_FAULT.

Fault

PACK fire failure (fire condition detected).

CauseThe fire-detection input for the pack has triggered - smoke, heat, or fire detected at the battery.

Recommended fixTreat as an emergency: evacuate the area and contact emergency services. Do not re-energize the system; contact Deye support afterwards.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

Warning codes (2)unit keeps running · needs attention

F054

ALARM_ID_TCP_CONNECT_FAIL.

Warning

TCP connection failure.

CauseThe battery's network (TCP) connection to the monitoring platform could not be established - LAN cabling, router, or network configuration issue. Battery operation itself does not depend on this link.

Recommended fixCheck the network cable, router, and network settings for the battery's monitoring connection, then restart. Contact Deye support if it will not connect.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

F055

ALARM_ID_W5500_SPI_COMM_FAIL.

Warning

The W5500 (Ethernet controller) SPI communication fails.

CauseThe BMS lost internal SPI communication with its W5500 Ethernet controller chip - a fault on the network interface, affecting monitoring connectivity.

Recommended fixRestart the system. if the fault persists, contact Deye support for service of the communication board.

Source:008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf· page 14

Still seeing a code on your GB-A HV Battery?

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 +971542899793 or use the contact form

Keep troubleshooting

Related devices

Common questions about GB-A HV Battery error codes

What is the difference between a fault and a warning on the GB-A HV Battery?: A fault puts the unit into protection and stops normal operation — this page lists 53 of them for the GB-A HV Battery. A warning leaves the unit running; there are 2 warning codes here. Resolve the cause of a fault before restarting; warnings can usually be cleared while the unit runs.
Does this page apply to other DEYE models?: No — this table was transcribed specifically from the GB-A HV Battery manual. Other DEYE devices have their own pages; start from the error-code hub to find the one matching the model number on your unit's label.
Where do these codes come from?: Every entry was transcribed from 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.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 (53)operation stops until cleared

ALARM_ID_SUM_OVER_VOLT_LEV_2.

ALARM_ID_SUM_LOW_VOLT_LEV_2.

ALARM_ID_CHG_OVER_TEMP_LEV_2.

ALARM_ID_DSG_OVER_TEMP_LEV_2.

ALARM_ID_CHG_LOW_TEMP_LEV_2.

ALARM_ID_DSG_LOW_TEMP_LEV_2.

ALARM_ID_OVER_DIFF_VOLT_LEV_2.

ALARM_ID_OVER_DIFF_TEMP_LEV_2.

ALARM_ID_CELL_OVER_VOLT_LEV_2.

ALARM_ID_CELL_LOW_VOLT_LEV_2.

ALARM_ID_PRE_CHG_RES_OVER_TEMP_LEV_2.

ALARM_ID_NORTH_CONNECTOR_OVER_TEMP_LEV_2.

ALARM_ID_SOUTH_CONNECTOR_OVER_TEMP_LEV_2.

ALARM_ID_CHG_OVER_CUR_LEV_2.

ALARM_ID_DSG_OVER_CUR_LEV_2.

ALARM_ID_SOC_OVER_LEV_2.

ALARM_ID_INSULATION_FAILURE_TWO.

ALARM_ID_HEAT_OVER_TEMP_LEV_2.

ALARM_ID_SOC_LOW_LEV_2.

ALARM_ID_DSG_RELAY_ADHESION.

ALARM_ID_POS_RELAY_ADHESION.

ALARM_ID_CHG_RELAY_ADHESION.

ALARM_ID_HEAT_RELAY_ADHESION.

ALARM_ID_ULTIMATE_PROTECTION.

ALARM_ID_POWER_SUPPLY_FAULT.

ALARM_ID_FUSE_BLOWN.

ALARM_ID_BMU_ADDR_REPEAT.

ALARM_ID_BMS_ADDR_REPEAT.

ALARM_ID_INTERNAL_COMM_ERROR.

ALARM_ID_PCS_CAN_COMM_FAIL.

MBMS_SAM_SIG_ID_PCS_ERROR_STATE.

ALARM_ID_PCS_RS485_COMM_ERROR.

ALARM_ID_FUSE_VOLT_SAMP_ERROR.

ALARM_ID_BAT_VOLT_SAMP_ERROR.

ALARM_ID_MOT_VOLT_SAMP_ERROR.

ALARM_ID_HTP_VOLT_SAMP_ERROR.

ALARM_ID_CELL_VOLT_SAMPLE_ERROR.

ALARM_ID_TEMP_SAMPLE_ERROR.

ALARM_ID_CURRENT_SAMPLE_ERROR.

ALARM_ID_CURRENT_MODULE_FAULT.

ALARM_ID_POS_RELAY_DRIVE_FAULT.

ALARM_ID_CHG_RELAY_DRIVE_FAULT.

ALARM_ID_DSG_RELAY_DRIVE_FAULT.

ALARM_ID_HEAT_RELAY_DRIVE_FAULT.

ALARM_ID_EEPROM_ERROR.

ALARM_ID_PRECHAGE_ERROR.

ALARM_ID_CHG_VOLT_LOW.

ALARM_ID_BMU_COMM_ERROR.

ALARM_ID_BMU_NUMBER_ERROR.

ALARM_ID_MBMS_NTC_BREAKLINE_ERROR.

ALARM_ID_BMU_NTC_BREAKLINE_ERROR.

ALARM_ID_PACK_THERMAL_RUNAWAY.

ALARM_ID_PACK_FIRE_FAULT.

Warning codes (2)unit keeps running · needs attention

ALARM_ID_TCP_CONNECT_FAIL.

ALARM_ID_W5500_SPI_COMM_FAIL.

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