Solis error codes explained

What 66 Solis 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 Solis questions

What does Solis Off "Off" mean?

Control device to shutdown Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does Solis LmtByEPM "LmtByEPM" mean?

The device's output is under controlled Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does Solis LmtByDRM "LmtByDRM" mean?

DRM Function ON 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 Solis LmtByVg "LmtByVg" mean?

The device is in the Volt-Watt mode Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does Solis LmtByVar "LmtByVar" mean?

The device is in the Volt-Var mode of operation Note the code, then restart the system once using the owner shutdown/start-up steps in your manual 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.

Solis S6-EH3P(5-10)K-H-AU User Manual V1.0 (2023-07-17), Table 7.1

Solis 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
OffFault	Off Control device to shutdown 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
LmtByEPMFault	LmtByEPM The device's output is under controlled 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
LmtByDRMFault	LmtByDRM DRM Function ON 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
LmtByTempWarning	LmtByTemp Over temperature power limited 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
LmtByFreqWarning	LmtByFreq Frequency power limited 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
LmtByVgFault	LmtByVg The device is in the Volt-Watt mode 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
LmtByVarFault	LmtByVar The device is in the Volt-Var mode of operation 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
LmtByUnFrWarning	LmtByUnFr Under frequency limit 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
StandbyFault	Standby Bypass run 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
StandbySynochWarning	StandbySynoch Off grid status to On grid status 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
GridToLoadFault	GridToLoad Grid to load 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
Surge AlarmFault	Surge Alarm On-site grid surge 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-G-V01Warning	OV-G-V01 Grid voltage exceeds the upper voltage range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
UN-G-V01Warning	UN-G-V01 Grid voltage exceeds the lower voltage range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-G-F01Warning	OV-G-F01 Grid frequency exceeds the upper frequency range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
UN-G-F01Warning	UN-G-F01 Grid frequency exceeds the lower frequency range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
G-PHASEWarning	G-PHASE Unbalanced grid voltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
G-F-GLUWarning	G-F-GLU Grid voltage frequency fluctuation 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
NO-GridInfo	NO-Grid No 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-G-V02Warning	OV-G-V02 Grid transient overvoltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-G-V03Warning	OV-G-V03 Grid transient overvoltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
IGFOL-FFault	IGFOL-F Grid current tracking 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-G-V05Warning	OV-G-V05 Grid voltage RMS instanta- neous overvoltage fault 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-G-V04Warning	OV-G-V04 Grid voltage exceeds the upper voltage range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
UN-G-V02Warning	UN-G-V02 Grid voltage exceeds the lower voltage range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-G-F02Warning	OV-G-F02 Grid frequency exceeds the upper frequency range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
UN-G-F02Warning	UN-G-F02 Grid frequency exceeds the lower frequency range 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
NO-BatteryFault	NO-Battery Battery is not connected 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-VbackupWarning	OV-Vbackup Inverting overvoltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
Over-LoadWarning	Over-Load Load overload fault 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
BatName-FAILFault	BatName-FAIL Wrong battery brand selection 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
CAN FailFault	CAN Fail CAN Fail 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-VbattFault	OV-Vbatt Battery undervoltage detected 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
UN-VbattFault	UN-Vbatt Battery overvoltage detected 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
Fan AlarmWarning	Fan Alarm Fan alarm 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-DC01 (1020 DATA:0001)Fault	OV-DC01 (1020 DATA:0001) DC 1 input overvoltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-DC02 (1020 DATA:0002)Fault	OV-DC02 (1020 DATA:0002) DC 2 input overvoltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
OV-BUS (1021 DATA:0000)Fault	OV-BUS (1021 DATA:0000) DC bus overvoltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
UN-BUS01 (1023 DATA:0001)Fault	UN-BUS01 (1023 DATA:0001) DC bus undervoltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter
UNB-BUS (1022 DATA:0000)Warning	UNB-BUS (1022 DATA:0000) DC bus unbalanced voltage 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 S6-EH3P(5-10)K-H-AU three-phase hybrid · Guide only. All work must be done by a licensed electrician.	S6-EH3P(5-10)K-H-AU three-phase hybrid	Inverter

Common Solis questions

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