How do I read the yellow fault lights on an AlphaESS SMILE-G3 battery?
Short answer
The second row of five lights shows the fault number in binary, worth 1, 2, 4, 8 and 16 from right to left. AlphaESS's SMILE-G3 manual (V01, 2023) lists protection codes such as 3 (high temperature) and 9 (cell undervoltage), and error codes such as 06 (breaker open) and 12 (more than one master). Many protections clear themselves.
Last checked 24 September 2026 · 1 source
What does this mean?
Protection 9: the manual describes pressing the battery button five times in 10 seconds to let the inverter recharge it. Let your installer decide on this. Error 12 'Multi master' says to restart all batteries. Error 15 'Total voltage fault' says to restart and then call for service.
What should I do first?
Record the code and current battery state before changing settings. Follow only the owner-safe reset steps in the manual.
When do I need an engineer?
Use an installer or manufacturer support route if the fault returns, involves isolation or protection, or the manual does not give an owner reset.
What to do next
If the system is hot, smoking, damaged or making unusual electrical noises, move away from it and follow the manufacturer emergency guidance.
Sources
Last checked: 24 September 2026