FranklinWH Battery Error Codes

Complete diagnostic guide for FranklinWH energy storage systems including aGate and battery modules.

Grid and Voltage Errors

Error codes related to grid connection, voltage levels, and frequency issues.

Code	Meaning	Possible Causes	Solutions
W00	Grid voltage too low	•Utility grid voltage below acceptable limits •Grid instability •Transformer issue •Voltage regulation failure	Check utility grid voltage Contact utility company if grid voltage is consistently low Wait for grid to stabilize Check inverter AC voltage settings Verify grid connection Monitor grid voltage trends
W01	Grid voltage too high	•Utility grid voltage exceeds acceptable limits •Grid instability •Transformer issue •Voltage regulation failure	Check utility grid voltage Contact utility company if grid voltage is consistently high Wait for grid to stabilize Check inverter AC voltage settings Verify grid connection Monitor grid voltage trends
W02	Grid frequency too low	•Utility grid frequency below acceptable limits •Grid instability •Generator issue •Frequency regulation failure	Check utility grid frequency Contact utility company if grid frequency is consistently low Wait for grid to stabilize Check inverter AC frequency settings Verify grid connection
W03	Grid frequency too high	•Utility grid frequency exceeds acceptable limits •Grid instability •Generator issue •Frequency regulation failure	Check utility grid frequency Contact utility company if grid frequency is consistently high Wait for grid to stabilize Check inverter AC frequency settings Verify grid connection
W29	Grid VoltLock failure	•Grid voltage lock mechanism failure •Voltage monitoring system issue •Grid connection instability •Hardware fault	Check grid voltage stability Verify grid connection Check voltage monitoring system Restart system if safe to do so Contact FranklinWH support or qualified technician

Battery Voltage and Current Errors

Error codes related to battery voltage levels, current limits, and battery management system (BMS) issues.

Code	Meaning	Possible Causes	Solutions
W06	Battery undervoltage	•Battery deep discharge •Battery capacity degradation •Charging system failure •BMS issue	Check battery state of charge Verify charging system operation Check battery capacity Monitor battery voltage Contact qualified technician if voltage remains low
W07	Battery voltage too low	•Battery discharge below minimum •Battery aging •Charging system failure •BMS protection activated	Check battery state of charge Verify charging system is operating Check battery health status Allow battery to charge if safe Contact FranklinWH support if issue persists
W08	Battery voltage too high	•Battery overcharging •Charging system fault •BMS issue •Voltage regulation failure	Check battery charging status Verify battery management system operation Check charging system settings Monitor battery voltage Contact qualified technician if voltage remains high
W16	BMS overvoltage	•Battery cell overvoltage •BMS voltage monitoring fault •Charging system overvoltage •Battery cell imbalance	Check battery cell voltages Verify BMS operation Check charging system Monitor battery cell balance Contact FranklinWH support immediately
W21	BMS undervoltage	•Battery cell undervoltage •BMS voltage monitoring fault •Deep discharge •Battery cell imbalance	Check battery cell voltages Verify BMS operation Check battery state of charge Monitor battery cell balance Contact FranklinWH support if issue persists
W23	BMS significant overvoltage	•Severe battery cell overvoltage •Critical BMS fault •Charging system failure •Battery cell damage	Shut down system immediately Do not attempt to restart Check battery cell voltages Contact FranklinWH support immediately Do not bypass safety systems
W14	BMS discharge overcurrent	•Discharge current exceeds limits •Load demand too high •BMS current protection •Battery module fault	Reduce load demand Check discharge current settings Verify BMS operation Check battery module status Contact FranklinWH support if issue persists
W15	BMS charge overcurrent	•Charge current exceeds limits •Charging system fault •BMS current protection •Battery module fault	Check charging current settings Verify charging system operation Check BMS operation Check battery module status Contact FranklinWH support if issue persists
W19	BMS voltage imbalance	•Battery cell voltage imbalance •Cell aging differences •BMS balancing failure •Battery module issue	Check battery cell voltages Verify BMS balancing operation Monitor cell voltage differences Allow BMS to balance cells Contact FranklinWH support if imbalance persists

Battery Temperature Errors

Error codes related to battery temperature management and thermal protection.

Code	Meaning	Possible Causes	Solutions
W17	BMS overtemperature	•Battery temperature exceeds limits •Inadequate ventilation •Ambient temperature too high •Cooling system failure	Check battery temperature Ensure adequate ventilation around battery Maintain minimum clearance from walls Check for obstructions blocking airflow Check ambient temperature Contact FranklinWH support if temperature remains high
W18	BMS discharge temperature too low	•Battery temperature below minimum for discharge •Ambient temperature too low •Installation in unheated space	Check battery temperature Verify ambient temperature meets requirements Allow battery to warm up Check installation location Review temperature requirements
W22	BMS charge temperature too low	•Battery temperature below minimum for charging •Ambient temperature too low •Installation in unheated space	Check battery temperature Verify ambient temperature meets requirements Allow battery to warm up before charging Check installation location Review temperature requirements
W24	BMS significant overtemperature	•Severe battery overheating •Critical thermal fault •Cooling system failure •Battery damage	Shut down system immediately Do not attempt to restart Check battery temperature Verify ventilation Contact FranklinWH support immediately Do not bypass safety systems

Battery Management System (BMS) Errors

Error codes related to BMS communication, firmware, and system errors.

Code	Meaning	Possible Causes	Solutions
W20	BMS communication error	•Communication failure between BMS and inverter •Communication cable issue •BMS module fault •Firmware mismatch	Check BMS communication cables Verify BMS module connections Check firmware versions are compatible Restart system if safe to do so Contact FranklinWH support if issue persists
W25	BMS update in progress	•BMS firmware update •System maintenance •Firmware upgrade	Wait for BMS update to complete Do not interrupt the update process Monitor update progress No action required during update
W26	BMS program version error	•BMS firmware version mismatch •Incompatible firmware version •Firmware corruption	Check BMS firmware version Verify firmware compatibility Contact FranklinWH support for firmware update Do not attempt firmware update without proper knowledge
W27	BMS program update failed	•Firmware update interruption •Communication failure during update •BMS module fault •Update file corruption	Do not attempt to restart update Check BMS communication Contact FranklinWH support immediately Do not bypass safety systems Wait for qualified technician
W13	Battery current loss	•Battery current interruption •Battery module disconnection •Current sensor fault •Battery connection issue	Check battery connections Verify battery module connections Check current sensors Inspect battery wiring Contact FranklinWH support if issue persists

Solar and Power Loss Errors

Error codes related to solar production, power loss, and system operation.

Code	Meaning	Possible Causes	Solutions
W04	Solar power loss	•Solar panel output lost •PV string disconnection •Inverter PV input issue •Shading on panels •Panel fault	Check solar panel connections Verify PV string connections Check for shading on panels Inspect panels for damage Check inverter PV input Verify solar production in monitoring app
W05	Battery power loss	•Battery disconnected •Battery module failure •Battery connection issue •BMS protection activated	Check battery connections Verify battery module status Check BMS status Inspect battery wiring Contact FranklinWH support if issue persists
W30	PV system off	•PV system disconnected •PV circuit breaker tripped •PV disconnect switch open •Solar panel fault	Check PV circuit breaker Verify PV disconnect switch is closed Check PV system connections Inspect solar panels Verify PV system is properly connected

System Protection and Safety Errors

Error codes related to system protection, overload, and safety systems.

Code	Meaning	Possible Causes	Solutions
W09	System overload	•Load demand exceeds system capacity •Multiple high-power loads •System capacity exceeded •Inverter overload	Reduce load demand Turn off unnecessary loads Check system capacity rating Verify load distribution Contact FranklinWH support if overload persists
W10	GFCI overcurrent	•Ground fault circuit interrupter triggered •Ground fault detected •GFCI protection activated •Electrical fault	Do not reset GFCI immediately Check for ground faults Inspect electrical connections Verify proper grounding Contact qualified electrician before resetting Do not bypass safety systems
W11	Line-Neutral reversal	•Incorrect wiring •L-N connection reversed •Installation error •Electrical connection fault	Do not attempt to fix yourself Shut down system immediately Contact qualified electrician Verify wiring is correct Do not bypass safety systems
W28	CT (Current Transformer) reversal	•CT wiring reversed •Installation error •CT connection fault •Monitoring system issue	Check CT wiring Verify CT connections are correct Check monitoring system Contact qualified technician for correction

Hardware and System Errors

Error codes related to hardware failures, fan issues, and system resets.

Code	Meaning	Possible Causes	Solutions
W12	Fan failure	•Cooling fan malfunction •Fan motor failure •Fan obstruction •Fan control circuit fault	Check fan operation Verify fan is not obstructed Check fan connections Clean fan if dirty Contact FranklinWH support if fan does not operate
W31	System reset	•System restart •Firmware update •Manual reset •System recovery •Power cycle	Wait for system to complete reset Monitor system status Check system operation after reset Verify all connections Contact FranklinWH support if reset issues persist

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Important Information

If you encounter persistent errors or are unable to resolve an issue using the solutions provided, contact FranklinWH customer support or a qualified solar system technician for professional assistance. Battery systems involve high voltage DC electricity, which can be extremely dangerous. Never attempt to repair electrical components, wiring, or battery modules yourself unless you are a qualified and certified technician. Different FranklinWH system configurations may have model-specific error codes—always consult your system's documentation and the FranklinWH monitoring app for the most accurate information.

For technical support, contact FranklinWH customer service or consult a qualified solar system technician for expert assistance.

Safety Information: Battery systems operate at high voltages that can cause serious injury or death. Always shut down the system properly before any work. DC electricity from batteries is present whenever the battery is charged, even if the system is off. Never work on battery systems without proper safety equipment and training. Always follow lockout/tagout procedures. Working with battery systems requires specialized training and certification. If you are unsure about any procedure, contact a qualified technician immediately. Never bypass safety systems or attempt repairs you are not qualified to perform.

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Troubleshooting Guidelines

Common Resolution Steps

✓Check FranklinWH monitoring app for detailed error information
✓Verify system is properly shut down before any inspection
✓Check system status indicators and LED lights
✓Verify network connection for monitoring system
✓Check battery temperature and ventilation
✓Document error codes and system status for service calls
✓Contact qualified technician for electrical issues

Prevention Strategies

✓Schedule regular professional maintenance
✓Ensure adequate battery ventilation (minimum clearance required)
✓Monitor system performance regularly through FranklinWH app
✓Maintain proper operating temperature range
✓Keep system documentation accessible
✓Maintain proper network connectivity
✓Follow manufacturer maintenance schedule

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Frequently Asked Questions

What does error code W00 mean on my FranklinWH battery?

Error code W00 indicates grid voltage is too low. Check utility grid voltage, contact your utility company if grid voltage is consistently low, wait for grid to stabilize, check inverter AC voltage settings, and verify grid connection. The system will automatically reconnect when grid voltage returns to normal.

What should I do if I see error code W16 (BMS overvoltage)?

Error code W16 indicates battery management system overvoltage. Check battery cell voltages, verify BMS operation, check charging system, monitor battery cell balance, and contact FranklinWH support immediately. Do not attempt to reset the system without professional assistance.

Why is my battery showing error code W17 (BMS overtemperature)?

Error code W17 indicates battery temperature is too high. Check battery temperature, ensure adequate ventilation around battery, maintain minimum clearance from walls, check for obstructions blocking airflow, check ambient temperature, and contact FranklinWH support if temperature remains high.

How do I fix error code W20 (BMS communication error)?

For BMS communication errors, check BMS communication cables, verify BMS module connections, check firmware versions are compatible, restart system if safe to do so, and contact FranklinWH support if the issue persists. Do not attempt to repair communication systems yourself.

What causes error code W09 (system overload)?

Error code W09 indicates system overload. Reduce load demand, turn off unnecessary loads, check system capacity rating, verify load distribution, and contact FranklinWH support if overload persists. The system will automatically protect itself from damage.

How often should I maintain my FranklinWH battery system?

Regular maintenance helps prevent many error codes. Ensure adequate ventilation (minimum clearance required), monitor system performance regularly through the FranklinWH app, maintain proper operating temperature range, schedule professional maintenance annually, and follow manufacturer recommendations for your specific model.

Can I repair FranklinWH battery systems myself?

Some basic troubleshooting like checking the monitoring app, verifying network connections, and checking status indicators can be done safely. However, all electrical work, wiring repairs, and battery repairs must be performed by qualified and certified technicians. Battery systems involve high voltage DC electricity that can be extremely dangerous. Always contact a qualified technician for electrical issues.

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Summary

Proper interpretation of FranklinWH battery error codes is essential for efficient troubleshooting and maintenance. This comprehensive reference enables quick problem identification and guides appropriate response actions. FranklinWH battery systems display error codes through the monitoring app and system displays to indicate specific issues. Understanding these codes helps maintain system performance and maximizes energy storage efficiency. FranklinWH manufactures premium battery storage systems including aGate and battery modules, each with model-specific features and error code systems. This guide provides diagnostics and solutions for all common FranklinWH battery error codes.

ℹ️For persistent errors or issues that cannot be resolved using this guide, contact FranklinWH customer support or consult a qualified solar system technician for professional assistance. Some errors may require technical support, component replacement, or specialized diagnostic equipment. Always document error codes and symptoms when contacting support for faster resolution. Note that error code formats may vary by system model and software version—always consult your specific system's documentation and the FranklinWH monitoring app for the most accurate information. Safety should always be the top priority when working with battery systems. Battery systems involve high voltage DC electricity that can cause serious injury or death. Never work on battery systems unless you are a qualified and certified technician. Always follow proper safety procedures and lockout/tagout protocols.