SAJ R6 3-15K-T2 three-phase string error codes explained

What 75 SAJ R6 3-15K-T2 three-phase string inverter & 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.

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

SAJ R6-(3-15)K-T2 User Manual V0.4, ch. 6 Fault Code & Troubleshooting

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

Code	Message & meaning	Model	Type
1Fault	Master Relay Error Master Relay Error 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
2Fault	Master EEPROM Error Master EEPROM Error 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
3Warning	Master Temperature High Error Master Temperature High Error What you can do Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents It usually recovers once it cools down If it repeats often or you can hear a noisy/failed fan, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
4Warning	Master Temperature Low Error Master Temperature Low Error What you can do Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents It usually recovers once it cools down If it repeats often or you can hear a noisy/failed fan, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
5Warning	Lost Communication M<->S Lost Communication M<->S What you can do Check that your home Wi-Fi/internet is working and restart your router Wait an hour - monitoring often reconnects by itself If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
6Safety-Critical	GFCI Device Error GFCI Device Error What you can do Keep clear and do not touch the inverter or cabling Note the code, date and time Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
7Fault	DCI Device Error DCI Device Error What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
8Fault	Current Sensor Error Current Sensor Error 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
9Warning	Master Phase1 Voltage High Master Phase1 Voltage High What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
10Warning	Master Phase1 Voltage Low Master Phase1 Voltage Low What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
11Warning	Master Phase2 Voltage High Master Phase2 Voltage High What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
12Warning	Master Phase2 Voltage Low Master Phase2 Voltage Low What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
13Warning	Master Phase3 Voltage High Master Phase3 Voltage High What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
14Warning	Master Phase3 Voltage Lo w Master Phase3 Voltage Lo w What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
15Warning	Grid Voltage 10Min High Grid Voltage 10Min High What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
16Warning	OGrid Output Voltage Low OGrid Output Voltage Low What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
17Fault	OGrid Output Sho Circuit OGrid Output Sho Circuit 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
18Warning	Master Grid Frequency High Master Grid Frequency High What you can do This is caused by the mains frequency moving outside the allowed range, usually briefly The inverter reconnects by itself once the grid is stable If it keeps happening, note the times and call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
19Warning	Master Grid Frequency Low Master Grid Frequency Low What you can do This is caused by the mains frequency moving outside the allowed range, usually briefly The inverter reconnects by itself once the grid is stable If it keeps happening, note the times and call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
21Fault	Phase1 DCV High Phase1 DCV High What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
22Fault	Phase2 DCV High Phase2 DCV High What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
23Fault	Phase3 DCV High Phase3 DCV High What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
24Info	Master No Grid Error Master No Grid Error What you can do Check whether the rest of your house or street has power, and check your network operator's outage map Check the switchboard for a tripped solar/inverter breaker - reset it once only; if it trips again, leave it off and call an electrician Once normal power is back the inverter usually reconnects on its own within a few minutes If the power is normal but the alarm stays, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
27Safety-Critical	GFCI Error GFCI Error What you can do Keep clear and do not touch the inverter or cabling Note the code, date and time Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
28Fault	Phase1 DCI Error Phase1 DCI Error What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
29Fault	Phase2 DCI Error Phase2 DCI Error What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
30Fault	Phase3 DCI Error Phase3 DCI Error What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
31Safety-Critical	ISO Error ISO Error What you can do Do not touch the panels, rooftop isolators or DC cables Note the code and whether it appears in wet weather or early morning - this helps the electrician If it clears by itself once things dry out, still let us know if it keeps returning Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
32Warning	Bus Voltage Balance Error Bus Voltage Balance Error What you can do Check that your home Wi-Fi/internet is working and restart your router Wait an hour - monitoring often reconnects by itself If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
33Fault	Master Bus Voltage High Master Bus Voltage High 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
34Fault	Master Bus Voltage Low Master Bus Voltage Low 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
35Fault	Master Grid Phase Lost Master Grid Phase Lost 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
36Fault	Master PV Voltage High Master PV Voltage High What you can do Do not touch the DC isolators or cables Note the time - this often shows on cold, very sunny mornings Call your installer - the panel strings may need to be checked against the inverter's limits R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
37Info	Master Islanding Error Master Islanding Error What you can do Check whether the rest of your house or street has power, and check your network operator's outage map Check the switchboard for a tripped solar/inverter breaker - reset it once only; if it trips again, leave it off and call an electrician Once normal power is back the inverter usually reconnects on its own within a few minutes If the power is normal but the alarm stays, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
38Fault	Master HW Bus Voltage High Master HW Bus Voltage High 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
39Fault	Master HW PV Current High Master HW PV Current High What you can do Check solar generation in the app compared with similar days Do not touch the DC isolators, cables or connectors, and don't go on the roof If it doesn't clear by itself, call your installer R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
40Fault	Master Self-Test Failed Master Self-Test Failed 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
41Fault	Master HW Inv Current High Master HW Inv Current High 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
42Fault	Master AC SPD Error Master AC SPD Error 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter
43Fault	Master DC SPD Error Master DC SPD Error 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 R6 3-15K-T2 three-phase string · Guide only. All work must be done by a licensed electrician.	R6 3-15K-T2 three-phase string	Inverter

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