SAJ H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) error codes explained

What 83 SAJ H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) 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 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 The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
2Fault	Master EEPROM Error The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
3Warning	Master Temperature High Error The inverter is running too hot, so it has reduced output or paused to protect itself. What you can do Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water Let it cool. It normally resumes by itself If it keeps happening on mild days, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
4Warning	Master Temperature Low Error The inverter temperature is below its operating range. What you can do Wait for temperatures to rise. It should recover by itself If it persists in normal weather, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
5Fault	Lost Communication M<->S The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
6Fault	GFCI Device Error The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
7Fault	DCI Device Error The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
8Fault	Current Sensor Error The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
9Warning	Master Phase1 Voltage High The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter. What you can do Wait. The inverter reconnects by itself once voltage is back within limits Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
10Warning	Master Phase1 Voltage Low The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter. What you can do Wait. The inverter reconnects by itself once voltage is back within limits Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
11Warning	Master Phase2 Voltage High The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter. (Phase 2/3 codes apply to three-phase models.) What you can do Wait. The inverter reconnects by itself once voltage is back within limits Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
12Warning	Master Phase2 Voltage Low The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter. (Phase 2/3 codes apply to three-phase models.) What you can do Wait. The inverter reconnects by itself once voltage is back within limits Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
13Warning	Master Phase3 Voltage High The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter. (Phase 2/3 codes apply to three-phase models.) What you can do Wait. The inverter reconnects by itself once voltage is back within limits Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
14Warning	Master Phase3 Voltage Low The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter. (Phase 2/3 codes apply to three-phase models.) What you can do Wait. The inverter reconnects by itself once voltage is back within limits Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
15Warning	Grid Voltage 10Min High The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter. What you can do Wait. The inverter reconnects by itself once voltage is back within limits Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
16Warning	OffGrid Output Voltage Low The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power. What you can do Switch off large appliances on backup circuits Wait for the system to retry (some models lock out for a period after repeated overloads) If it trips with only small loads on, or you suspect a short circuit, call an electrician H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
17Warning	OffGrid Output Short Circuit The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power. What you can do Switch off large appliances on backup circuits Wait for the system to retry (some models lock out for a period after repeated overloads) If it trips with only small loads on, or you suspect a short circuit, call an electrician H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
18Warning	Master Grid Frequency High Grid frequency moved outside the allowed range, so the inverter disconnected or reduced output as the standards require. What you can do Wait for automatic reconnection If it happens often, record the times and contact us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
19Warning	Master Grid Frequency Low Grid frequency moved outside the allowed range, so the inverter disconnected or reduced output as the standards require. What you can do Wait for automatic reconnection If it happens often, record the times and contact us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
21Fault	Phase1 DCV Error The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected. What you can do If it happened once and the system recovered, keep an eye on it If it repeats, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
22Fault	Phase2 DCV Error The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected. (Phase 2/3 codes apply to three-phase models.) What you can do If it happened once and the system recovered, keep an eye on it If it repeats, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
23Fault	Phase3 DCV Error The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected. (Phase 2/3 codes apply to three-phase models.) What you can do If it happened once and the system recovered, keep an eye on it If it repeats, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
24Warning	Master No Grid Error The inverter cannot see a normal mains supply, so it has stopped exporting to the grid (and a hybrid system may switch to backup). What you can do Check whether the rest of the house (or your neighbours) has power, and check your network operator's outage map Check the switchboard for a tripped solar supply main switch or inverter breaker. Only reset it once. If it trips again, leave it off and call an electrician Wait. Once normal grid power is back, the inverter normally reconnects by itself after its safety checks (often a few minutes) If grid power is normal but the alarm stays, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
27Critical	GFCI Error The inverter measured leakage (residual) current flowing to earth above its safety limit and disconnected. This can indicate damaged insulation somewhere in the system. What you can do Don't touch cabling or equipment If it happens repeatedly, or together with an insulation/isolation alarm, call an electrician or us promptly H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
28Fault	Phase1 DCI Error The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected. What you can do If it happened once and the system recovered, keep an eye on it If it repeats, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
29Fault	Phase2 DCI Error The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected. (Phase 2/3 codes apply to three-phase models.) What you can do If it happened once and the system recovered, keep an eye on it If it repeats, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
30Fault	Phase3 DCI Error The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected. (Phase 2/3 codes apply to three-phase models.) What you can do If it happened once and the system recovered, keep an eye on it If it repeats, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
31Critical	ISO Error Insulation resistance between the solar circuits and earth is too low. SAJ notes that on this model an earth fault alarm turns the LED ring red and shows error <31> in the eSAJ Home app. What you can do Do not touch panels, DC cables, rooftop isolators or the inverter's DC connectors If it clears by itself after the weather dries out, still report it, because repeated alarms point to a developing fault Book an electrician or call us. An insulation test needs specialist equipment If you see smoke, burn marks or smell burning, keep clear and call 000 H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
32Fault	Bus Voltage Balance Error The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
33Fault	Master Bus Voltage High The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
34Fault	Master Bus Voltage Low The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
35Warning	Master Grid Phase Error The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure. What you can do Check whether you have a partial power outage (some circuits or phases off) Wait for automatic reconnection after the grid returns to normal If it persists or started after electrical work, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
36Fault	Master PV Voltage High Error The DC voltage coming from the solar panels is higher than the inverter is rated for. Over-voltage can damage the inverter. What you can do Do not touch the DC isolator or cables unless the manufacturer's owner shutdown tells you to Call us. The string design needs to be checked by a licensed installer H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
37Warning	Master Islanding Error The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure. What you can do Check whether you have a partial power outage (some circuits or phases off) Wait for automatic reconnection after the grid returns to normal If it persists or started after electrical work, call us H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
38Fault	Master HW Bus Voltage High The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
39Fault	Master HW PV Current High The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
40Fault	Master Self-Test Failed The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
41Fault	HW Inv Current High The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician. What you can do Note the code, time and whether it clears by itself If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling. If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
42Fault	Master AC SPD Error A surge protection device (SPD) inside or connected to the inverter is reporting a fault, often after a lightning storm or grid surge. What you can do Don't open the inverter Call us. SPDs must be replaced by a licensed electrician H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter
43Fault	Master DC SPD Error A surge protection device (SPD) inside or connected to the inverter is reporting a fault, often after a lightning storm or grid surge. What you can do Don't open the inverter Call us. SPDs must be replaced by a licensed electrician H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU) · Guide only. All work must be done by a licensed electrician.	H2 hybrid series (H2-S2 single-phase / H2-T2 three-phase, AU)	Inverter

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