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Pylontech Error Codes

Complete Australian reference for Pylontech battery diagnostic codes with professional troubleshooting guidance and repair solutions

Identify issues with your Pylontech battery system and understand proper response procedures for Australian installations

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Pylontech Battery Models in Australia

Pylontech offers a comprehensive range of premium battery storage systems designed for Australian residential and commercial solar installations. The US2000, US3000, and Force H2 series deliver high-quality lithium-ion battery storage solutions with advanced battery management systems compatible with Australian grid standards (230V single-phase / 400V three-phase, 50Hz). These diagnostic codes apply to Pylontech battery systems installed across Australia and comply with AS/NZS 4777.2 grid connection standards. All Pylontech battery systems installed in Australia must be installed by CEC (Clean Energy Council) accredited installers. Error indicators appear as numeric error codes (e.g., 60, 71, 72, 80-86), LED blink patterns on ALM (alarm) LEDs, and status messages in the monitoring system. Error codes are displayed through LED sequences and system communication, providing comprehensive diagnostic information for system operators and installers.

Reading Error Codes

• Check ALM LED blink patterns (1, 2, 5, 15 blinks)
• Review numeric error codes (60, 71, 72, 80-86)
• Check battery LED status indicators on front panel
• Review monitoring system for status messages
• Consult Pylontech installation manual for your specific model
• Master battery has red SW button for reset

Pylontech Product Series

• US2000 - 2.4 kWh battery modules
• US3000 - 3.5 kWh battery modules
• Force H2 - High-capacity battery systems
• Advanced battery management system
• CAN bus communication

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Understanding Pylontech Diagnostic Codes

Pylontech battery systems feature sophisticated diagnostic capabilities that continuously monitor system performance and automatically detect operational issues. When a problem is identified, the system communicates through multiple channels: numeric error codes (e.g., 60, 71, 72, 80-86), LED blink patterns on ALM (alarm) LEDs, and status messages in the monitoring system. This comprehensive diagnostic framework enables rapid problem identification and helps determine appropriate response procedures. All Pylontech battery series utilise continuous performance monitoring with real-time error detection. LED blink patterns indicate specific errors: 1 blink (short circuit), 2 blinks (overcurrent discharge), 5 blinks (cell/module undervoltage), 15 blinks (system error), and continuously blinking (communication error). Always reference your specific system's installation and service manual for precise code definitions and model-specific information.

Australian Standards Compliance: Pylontech battery systems installed in Australia must comply with AS/NZS 4777.2 grid connection standards and be installed by Clean Energy Council (CEC) accredited installers. All electrical work must be performed by licensed electricians in accordance with Australian wiring rules (AS/NZS 3000).

Communication and System Errors

Issues with battery communication and system configuration.

Code	Meaning	Possible Causes	Solutions
80	CAN Bus Communication Error - Communication error in CAN bus between battery and inverter	•CAN bus wire break •Battery not responding •CAN bus failure •Inverter communication issue •Firmware incompatibility	Check CAN bus wiring between battery and inverter Verify battery is properly connected Check battery LED status indicators Restart battery system by turning off all modules and waiting 10-20 seconds Press and hold red SW button on master battery for 1 second Verify inverter and battery firmware compatibility Check for loose or damaged CAN bus cables Contact CEC-accredited Pylontech installer if communication cannot be restored
81	Connection Error - General connection error between battery and other system components	•Connection wire break •Battery not responding •Connection failure •Inverter connection issue •Module connection error	Check all connection wiring between battery and inverter Verify battery is properly connected Check battery LED status indicators Restart battery system by power cycling Verify all module connections are secure Check for loose or damaged connection cables Contact CEC-accredited installer if connection cannot be restored
82	Synchronisation Loss - Synchronisation between battery and system is lost	•Synchronisation failure •System configuration error •Communication interruption •Firmware mismatch •Module synchronisation error	Restart battery system by turning off all modules Wait 10-20 seconds Turn all module switches back on Press and hold red SW button on master battery Verify system configuration Check firmware compatibility Contact CEC-accredited installer if synchronisation cannot be restored
71	Firmware Version Not Compatible - Battery firmware version is not compatible with system	•Firmware version mismatch •Incompatible firmware versions •Firmware update required •System firmware incompatibility	Check firmware versions of battery and inverter Update battery firmware to compatible version Update inverter firmware if necessary Verify firmware compatibility list Contact CEC-accredited Pylontech installer for firmware update assistance Do not mix incompatible firmware versions
ALM LED Continuously Blinking	Communication Error - System error or communication error with other batteries	•Communication wire break •Module communication failure •CAN bus error •System communication error	Check communication cables for proper seating and damage Verify correct communication protocols and settings are used Restart battery system by power cycling Check module LED status indicators Verify all modules are communicating Contact CEC-accredited installer if communication cannot be restored

Battery and Charging Errors

Issues with battery cells, charging, and discharging.

Code	Meaning	Possible Causes	Solutions
60	Feedback Protection - Battery status prevents charging and discharging after successful communication	•Battery protection activated •Battery status issue •System protection •Battery management system error	Check battery status and state of charge Verify battery is not in protection mode Restart battery system by power cycling Check battery management system status Contact CEC-accredited installer if protection cannot be cleared
72	Current Sharing Error - Problem with current distribution within system	•Current sharing circuit failure •Module current imbalance •Current distribution error •Battery management system error	Check current sharing between modules Verify all modules are functioning correctly Check module connections Restart battery system by power cycling Contact CEC-accredited installer if current sharing cannot be restored
83	Battery Voltage Different Detected - Different voltage values detected within battery system	•Module voltage imbalance •Cell voltage imbalance •Battery cell failure •Module failure •Voltage measurement error	Check individual module voltages with calibrated multimeter Verify module voltages are balanced Check for faulty modules Allow battery management system to balance voltages Contact CEC-accredited installer if voltage imbalance persists May require module replacement
5 Blinking ALM LEDs	Cell or Module Undervoltage - One or more cells or modules have too low voltage	•Deep discharge •Cell failure •Module failure •Battery not used for extended period •System fault	Charge battery to increase voltage Check cell voltages with calibrated multimeter Replace defective modules if necessary Avoid deep discharge cycles Contact CEC-accredited installer if voltage remains low after charging This may require module replacement
Battery Overvoltage	Battery voltage exceeds maximum limit	•Overcharging •Battery cell imbalance •Charging system fault •Battery management system error •Cell failure	Stop charging immediately Check battery voltage with calibrated multimeter Verify charging system is functioning correctly Check for battery cell imbalance Contact CEC-accredited Pylontech installer immediately Do not attempt to discharge if voltage is critically high This may require battery service or replacement
Battery Undervoltage	Battery voltage below minimum threshold	•Deep discharge •Battery not used for extended period •System fault •Battery cell imbalance •Discharging system fault	Stop discharging immediately Check battery voltage with calibrated multimeter Begin charging if safe to do so Check for battery cell imbalance Contact CEC-accredited Pylontech installer if voltage is critically low Avoid deep discharge cycles This may require battery service or replacement

Overcurrent and Protection Errors

Issues with overcurrent protection and discharge limits.

Code	Meaning	Possible Causes	Solutions
1 Blinking ALM LED	Overcurrent Discharge - Short circuit protection	•Short circuit in wiring •Reversed polarity •High discharge current •Faulty load •Wiring error	Check wiring for short circuits or reversed polarity Remove current load and test with different device Ensure no metal parts are grounded that touch positive pole Check all connections for proper polarity Verify load is within battery specifications Contact CEC-accredited installer if problem persists
2 Blinking ALM LEDs	Overcurrent Discharge - Protection against excessively high current discharge	•Excessively high discharge current •Load exceeds battery capacity •Faulty load •System overload	Reduce load to within battery specifications Check load current requirements Verify load is compatible with battery Remove excessive load Check for faulty load devices Contact CEC-accredited installer if problem persists

AC Grid and System Errors

Issues with AC grid connection and system configuration parameters.

Code	Meaning	Possible Causes	Solutions
84	AC Input Voltage and Frequency Different Detected - Deviations in AC input voltage and frequency detected	•Grid voltage fluctuations •Grid frequency fluctuations •Grid instability •Grid quality issues •Voltage measurement error	Check grid voltage and frequency with calibrated multimeter (should be 230V ±10% for single-phase, 400V ±10% for three-phase, 50Hz ±0.5Hz) Verify voltage and frequency are within allowable limits Wait for grid to stabilise Contact your DNSP (Distribution Network Service Provider) if voltage/frequency is consistently out of range Request DNSP to lower tap transformer if voltage consistently high System will automatically reconnect when grid stabilises within acceptable limits Contact CEC-accredited installer if problem persists
85	AC Output Current Asymmetry - Uneven AC output current detected	•AC output current imbalance •Load imbalance •Inverter fault •System configuration error	Check AC output current balance Verify load distribution Check inverter operation Review system configuration Contact CEC-accredited installer if current asymmetry persists
86	AC Output Mode Setting Different - Different AC output mode settings detected	•Configuration mismatch •System configuration error •Settings not synchronised •Firmware issue	Check AC output mode settings Verify all modules have same settings Synchronise system settings Review system configuration Contact CEC-accredited installer if settings cannot be synchronised

Hardware and Internal Errors

Issues with battery internal systems and hardware components.

Code	Meaning	Possible Causes	Solutions
15 Blinking ALM LEDs	System Error - General system error detected	•System fault •Internal error •Battery management system error •General system malfunction	Restart battery system by turning off all modules Wait 10-20 seconds Turn all module switches back on Press and hold red SW button on master battery If error persists, contact CEC-accredited Pylontech installer Do not repeatedly restart if error continues May require professional diagnosis and repair
Internal Battery Error	Internal battery fault or hardware error	•Internal battery fault •Control board issue •Hardware failure •Component malfunction	Restart battery system by power cycling If error persists, contact CEC-accredited Pylontech installer Do not repeatedly restart if error continues Note error details and contact CEC-accredited installer May require battery replacement or repair
Module Failure	Battery module failure detected	•Module hardware failure •Module cell failure •Module communication failure •Module control board issue	Identify which module has failed Check module LED status indicators Contact CEC-accredited Pylontech installer immediately This requires professional diagnosis Module may need replacement Do not attempt to repair yourself

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Critical Safety Notice

Do not attempt DIY repairs on your Pylontech battery system. The majority of diagnostic codes relate to high-voltage battery systems, battery management systems, or critical safety features. Specific codes requiring immediate professional intervention include: Battery Overvoltage, Battery Undervoltage, Overcurrent Discharge (1-2 blinking ALM LEDs), and Module Failure. Upon encountering these codes, immediately shut down the system if safe to do so and contact a CEC-accredited Pylontech installer or service without delay.

Professional service by CEC-accredited installers is mandatory—contact a licensed solar installer or reach out to CEC-accredited Pylontech installer for expert assistance.

Australian Requirements: All battery repairs must be performed by Clean Energy Council (CEC) accredited installers in accordance with AS/NZS 4777.2 and Australian wiring rules (AS/NZS 3000). Unauthorised work on electrical systems poses extreme danger and violates Australian electrical safety regulations.

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Battery Reset Procedure

A reset can help resolve communication errors or restore functionality. Follow these steps to reset your Pylontech battery system:

1
Turn off inverter and all battery modules
Turn off the inverter. Turn off all toggle switches on the left side of each battery module.
2
Wait and turn modules back on
Wait 10 to 20 seconds. Turn all toggle switches back on.
3
Press SW button on master battery
Identify the master battery (connected to inverter). Press and hold the red SW button on the front of the master battery for 1 second until all LEDs light up.
4
Verify system operation
Observe LED indicators; a successful reset restores normal LED pattern. Turn the inverter back on.

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Maintenance Guidelines for Australian Installations

Scheduled Service Requirements

✓Professional inspection and service annually by CEC-accredited Pylontech installer
✓Monthly visual inspection of battery modules for damage or issues
✓Monitor system performance daily through monitoring system
✓Check battery status and LED indicators monthly
✓Verify CAN bus communication monthly
✓Check battery temperature and ventilation quarterly

Proactive Maintenance Strategies

✓Ensure adequate ventilation around battery modules (critical in Australian summer)
✓Keep battery in temperature-controlled environment
✓Monitor battery state of charge and health
✓Review system alerts and error codes promptly
✓Keep firmware updated for latest features and fixes
✓Inspect CAN bus wiring for damage or corrosion

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Frequently Asked Questions

What does error code 80 (CAN Bus Communication Error) mean?

Error code 80 indicates a communication error in the CAN bus between battery and inverter. Check CAN bus wiring, verify battery is properly connected, check battery LED status indicators, restart battery system by turning off all modules and waiting 10-20 seconds, press and hold red SW button on master battery, verify firmware compatibility, check for loose or damaged CAN bus cables, and contact CEC-accredited Pylontech installer if communication cannot be restored.

What does 1 blinking ALM LED (Overcurrent Discharge) mean?

1 blinking ALM LED indicates overcurrent discharge due to short circuit protection. Check wiring for short circuits or reversed polarity, remove current load and test with different device, ensure no metal parts are grounded that touch positive pole, check all connections for proper polarity, verify load is within battery specifications, and contact CEC-accredited installer if problem persists.

What does 5 blinking ALM LEDs (Cell/Module Undervoltage) mean?

5 blinking ALM LEDs indicate that one or more cells or modules have too low voltage. Charge battery to increase voltage, check cell voltages with calibrated multimeter, replace defective modules if necessary, avoid deep discharge cycles, contact CEC-accredited installer if voltage remains low after charging, and this may require module replacement.

How do I reset my Pylontech battery system?

To reset your Pylontech battery system: 1) Turn off inverter and all battery module switches, 2) Wait 10-20 seconds, 3) Turn all module switches back on, 4) Press and hold red SW button on master battery for 1 second until all LEDs light up, 5) Verify system operation by observing LED indicators, then turn inverter back on.

What does error code 84 (AC Input Voltage and Frequency Different) mean?

Error code 84 indicates deviations in AC input voltage and frequency detected. Check grid voltage and frequency with calibrated multimeter (should be 230V ±10% for single-phase, 400V ±10% for three-phase, 50Hz ±0.5Hz), verify voltage and frequency are within allowable limits, wait for grid to stabilise, contact your DNSP (Distribution Network Service Provider) if voltage/frequency is consistently out of range, request DNSP to lower tap transformer if voltage consistently high, and contact CEC-accredited installer if problem persists.

Can I repair my Pylontech battery system myself?

High-voltage battery systems must exclusively be serviced by CEC-accredited licensed professionals to ensure safety compliance with Australian standards. Homeowners can safely perform basic tasks like monitoring the system and checking LED indicators, but all technical repairs require certified CEC-accredited Pylontech installers. Unauthorised work on battery systems poses extreme danger and violates Australian electrical safety regulations and building codes.

What should I do if I see "Internal Error" in my monitoring system?

Internal Error can occur when individual modules shut down at low state of charge (SOC) and stop communication. This behaviour has been observed at SOC below 15%. Try resetting the battery system, check module SOC levels, ensure all modules are charging, and contact CEC-accredited installer if error persists.

How often should I check my battery system?

Monitor your battery system daily through the monitoring system, check battery status and LED indicators monthly, verify CAN bus communication monthly, and perform professional inspection and service annually by a CEC-accredited Pylontech installer. Review system alerts and error codes promptly.

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Summary

Proper interpretation of diagnostic codes is essential for effective Pylontech battery system troubleshooting in Australian installations. This comprehensive reference enables quick problem identification and guides appropriate response actions. Pylontech systems utilise numeric error codes (60, 71, 72, 80-86), LED blink patterns on ALM LEDs (1, 2, 5, 15 blinks), and status messages in the monitoring system to indicate specific sensor and system malfunctions. US2000, US3000, and Force H2 series battery systems provide diagnostic information through error codes and LED indicators for convenient diagnosis.

⚠️Complex diagnostic situations, especially those involving high-voltage battery systems, battery management systems, and overcurrent protection, require immediate professional evaluation by CEC-accredited installers. Critical codes demanding urgent response include: Battery Overvoltage, Battery Undervoltage, Overcurrent Discharge (1-2 blinking ALM LEDs), and Module Failure. These indicators represent serious safety hazards requiring certified CEC-accredited Pylontech installer response. Adherence to scheduled maintenance protocols and immediate attention to diagnostic codes extends equipment service life and minimises long-term operational costs. Note that error code formats may vary by model and firmware version—always consult your specific system's installation and service manual for precise interpretations. All repairs must comply with AS/NZS 4777.2 grid connection standards and Australian wiring rules (AS/NZS 3000).