Pylontech error codes explained

What 15 Pylontech battery fault and error codes mean, in plain English, with safe checks you can do and when to call a licensed electrician.

Safety first: never open the switchboard, remove covers, or pull apart or disconnect the inverter, batteries, isolators or wiring. Only use the switches and buttons described here. Anything else must be done by a licensed electrician. Call 1300 209 503 or book a service request.

Guide only. This information is a general guide taken from manufacturer documentation. All electrical work must be performed by a licensed electrician. Never open your inverter, battery or switchboard. If you see smoke, smell burning or see damage, keep clear and call 000.

Code	Message & meaning	Model	Type
1Fault	No power output, no led on. Press start button too short. What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
The battery voltage is too low.Fault	The battery voltage is too low. The battery voltage is too low. What you can do Note the code and the battery state of charge shown in the app Let the system run - some battery voltage protections clear by themselves after charging or discharging If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
The connector of base is failureFault	The connector of base is failure The connector of base is failure What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
2Fault	After turned on, status LED slow flashing orange. Others off. Self-checking failure. DC side has a voltage, but voltage difference with the battery system is higher than 20V. What you can do Check the battery status and any extra alarms in the app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear and call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
BMS internal failure.Fault	BMS internal failure. BMS internal failure. What you can do Check the battery status and any extra alarms in the app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear and call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
3Fault	Status LED fast flashing orange, others off. The time interval after last time black start is too short. What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
4Fault	Buzzer rings continue Relay adhesion or failure. What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
5Fault	Status LED solid orange. Battery module LED blue solid. Communication lost with inverter What you can do Check the app - the battery may show as offline or with no state of charge Restart the system once using the shutdown and start-up steps in your owner's manual (battery last off, first on, unless your manual says otherwise) If the alarm comes back, call your installer - battery communication cables must be checked by them Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
Over current protection.Fault	Over current protection. Over current protection. What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
Controller failure.Fault	Controller failure. Controller failure. What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
6Fault	Status LED solid orange. Battery module exists LED in orange solid Over/ under temperature protection. What you can do Check the battery status and any extra alarms in the app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear and call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
Over voltage protection.Fault	Over voltage protection. Over voltage protection. What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
Under voltage protection.Fault	Under voltage protection. Under voltage protection. What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
Battery module BMS failureFault	Battery module BMS failure Battery module BMS failure What you can do Check the battery status and any extra alarms in the app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear and call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery
8Fault	Other failure Cell failure or electrical board failure. Or failure need debug tool for further debug. What you can do Check the battery status and any extra alarms in the app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear and call your installer Force H2 battery · Guide only. All work must be done by a licensed electrician.	Force H2 battery	Battery

Common Pylontech questions

What does Pylontech 1 "No power output, no led on." mean?

Press start button too short. Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

What does Pylontech The battery voltage is too low. "The battery voltage is too low." mean?

The battery voltage is too low. Note the code and the battery state of charge shown in the app This is a guide only; any electrical work must be done by a licensed electrician.

What does Pylontech The connector of base is failure "The connector of base is failure" mean?

The connector of base is failure Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

What does Pylontech 2 "After turned on, status LED slow flashing orange. Others off." mean?

Self-checking failure. DC side has a voltage, but voltage difference with the battery system is higher than 20V. Check the battery status and any extra alarms in the app This is a guide only; any electrical work must be done by a licensed electrician.

What does Pylontech BMS internal failure. "BMS internal failure." mean?

BMS internal failure. Check the battery status and any extra alarms in the app This is a guide only; any electrical work must be done by a licensed electrician.

Need help with this fault?

Get a licensed electrician to call you back.

Total Solar can help: our licensed electricians install and service systems. Based in Ellenbrook, WA, with Victoria and Queensland also available.

Or call 1300 209 503

Sources

Meanings are summarised from these manufacturer documents. Check your own model's manual, as codes vary between models and firmware versions.

Pylontech Force-H2 Operation Manual V2.2

Pylontech is a trademark of its owner. Total Solar is not affiliated with the manufacturer unless stated. All fault code guides

Common Pylontech questions

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