Fronius error codes explained

What 84 Fronius inverter 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.

Common Fronius questions

What does Fronius 108 "Stand-alone operation detected" mean?

Stand-alone operation detected Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Fronius 112 "RCMU error" mean?

RCMU error Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Fronius 301 "RCMU error" mean?

What does Fronius 306 "LOW PV OUTPUT Intermediate circuit voltage too low for feeding energy into the grid" mean?

LOW PV OUTPUT Intermediate circuit voltage too low for feeding energy into the grid Short-term interruption while feeding energy into the grid The inverter resumes with its start-up routine. Check solar generation in the app compared with similar days This is a guide only; any electrical work must be done by a licensed electrician.

What does Fronius 308 "Intermediate circuit overvoltage" mean?

Intermediate circuit overvoltage Short-term interruption while feeding energy into the grid The inverter resumes with its start-up routine. 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.

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.

Fronius Primo 3.0-1 - 8.2-1 Operating Instructions (online manual 42,0426,0191), Status codes classes 1-7

Fronius 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
102Warning	AC voltage too high AC voltage too high Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
103Warning	AC voltage too low AC voltage too low Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
105Warning	AC frequency too high AC frequency too high Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
106Warning	AC frequency too low AC frequency too low Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
107Info	No AC grid No AC grid Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
108Fault	Stand-alone operation detected Stand-alone operation detected Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
112Fault	RCMU error RCMU error Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
301Fault	RCMU error RCMU error Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
302Info	Overcurrent (DC) Overcurrent (DC) Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. What you can do This is normal at dawn, dusk or in heavy cloud If it shows in full sun, check the app for low generation and look for new shading from the ground (don't go on the roof) If generation stays low on sunny days, call your installer Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
303Warning	Power stage set overtemperature Power stage set overtemperature Short-term interruption while feeding energy into the grid due to overtemperature The inverter resumes with its startup routine. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
304Warning	Internal temperature too high Internal temperature too high Short-term interruption while feeding energy into the grid due to overtemperature The inverter resumes with its startup routine. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
306Fault	LOW PV OUTPUT Intermediate circuit voltage too low for feeding energy into the grid LOW PV OUTPUT Intermediate circuit voltage too low for feeding energy into the grid Short-term interruption while feeding energy into the grid The inverter resumes with its start-up routine. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
307Warning	LOW PV VOLTAGE DC input voltage too low for feeding energy into the grid LOW PV VOLTAGE DC input voltage too low for feeding energy into the grid Short-term interruption while feeding energy into the grid The inverter resumes with its start-up routine. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
308Fault	Intermediate circuit overvoltage Intermediate circuit overvoltage Short-term interruption while feeding energy into the grid The inverter resumes with its start-up routine. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
309Fault	DC input voltage MPPT 1 too high DC input voltage MPPT 1 too high Short-term interruption while feeding energy into the grid The inverter resumes with its start-up routine. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
313Fault	DC input voltage MPPT2 too high DC input voltage MPPT2 too high Short-term interruption while feeding energy into the grid The inverter resumes with its start-up routine. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
401Warning	Unable to communicate with the power stage set Unable to communicate with the power stage set The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
406Warning	Power stage set temperature sensor faulty Power stage set temperature sensor faulty The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
407Warning	Internal temperature sensor faulty Internal temperature sensor faulty The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
408Warning	Direct current feeding in detected Direct current feeding in detected The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
412Fault	Fixed voltage mode has been selected instead of MPP voltage mode, and the fixed voltage has been set to too low or too h Fixed voltage mode has been selected instead of MPP voltage mode, and the fixed voltage has been set to too low or too high a value. - 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
415Fault	Safety cut-out via option card or RECERBO has triggered Safety cut-out via option card or RECERBO has triggered The inverter is not feeding any energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
416Warning	No communication possible between power stage set and control system. No communication possible between power stage set and control system. The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
417Warning	Hardware ID problem Hardware ID problem The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
419Warning	Unique ID conflict Unique ID conflict The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
421Warning	HID range error HID range error The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
425Warning	Unable to communicate with the power stage set Unable to communicate with the power stage set The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
426 - 428Warning	Possible hardware fault Possible hardware fault The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
431Warning	Software problem Software problem The inverter is not feeding any energy into the grid. What you can do Make sure the system is online so it can receive updates Restart the system once using the owner steps in your manual If the alarm stays, call your installer - settings and firmware must be fixed by them or the manufacturer Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
436Warning	Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC bo Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
437Warning	Power stage set problem Power stage set problem The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
438Warning	Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC bo Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
443Fault	Intermediate circuit voltage too low or asymmetric Intermediate circuit voltage too low or asymmetric The inverter is not feeding any energy into the grid. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
445Fault	Impermissible limit value settings Impermissible limit value settings The inverter is not feeding any energy into the grid for safety reasons. 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
447Safety-Critical	Insulation fault Insulation fault If this status code keeps recurring, contact your system engineer 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
448Warning	Neutral conductor not connected Neutral conductor not connected If this status code keeps recurring, contact your system engineer What you can do Turn off some large appliances (air-conditioners, ovens, kettles, pool pumps) - backup outputs have a power limit The system usually recovers by itself once the load drops If it keeps happening with normal loads, call your installer Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
450Warning	Guard cannot be found Guard cannot be found If this status code keeps recurring, contact your system engineer What you can do Turn off some large appliances (air-conditioners, ovens, kettles, pool pumps) - backup outputs have a power limit The system usually recovers by itself once the load drops If it keeps happening with normal loads, call your installer Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
451Warning	Memory error detected Memory error detected The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
452Warning	Communication error between the processors Communication error between the processors The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter
453Warning	Short-term grid voltage error Short-term grid voltage error The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid 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 Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units) · Guide only. All work must be done by a licensed electrician.	Primo 3.0-1 to 8.2-1 (also similar on Symo/Galvo display units)	Inverter

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