Delta error codes explained

What 7 Delta 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.

Code	Message & meaning	Model	Type
Equipment fault.Fault	Equipment fault. Internal or external fault (interrupted feed). See also display messages! 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 SOLIVIA AP G3 (older single-phase) · Guide only. All work must be done by a licensed electrician.	SOLIVIA AP G3 (older single-phase)	Inverter
General error condition.Fault	General error condition. Solar inverter is not connected to the grid. No power is delivered. See also display messages! 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 SOLIVIA AP G3 (older single-phase) · Guide only. All work must be done by a licensed electrician.	SOLIVIA AP G3 (older single-phase)	Inverter
AC frequency failureWarning	AC frequency failure Grid frequency overshoo- ting or undershooting specified limit 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 SOLIVIA AP G3 (older single-phase) · Guide only. All work must be done by a licensed electrician.	SOLIVIA AP G3 (older single-phase)	Inverter
AC voltage failureWarning	AC voltage failure Grid voltage overshooting or undershooting specified limit 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 SOLIVIA AP G3 (older single-phase) · Guide only. All work must be done by a licensed electrician.	SOLIVIA AP G3 (older single-phase)	Inverter
AC relay failureInfo	AC relay failure One of the anti-islanding protection output relays is faulty / defective. 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 SOLIVIA AP G3 (older single-phase) · Guide only. All work must be done by a licensed electrician.	SOLIVIA AP G3 (older single-phase)	Inverter
DC injection failureFault	DC injection failure DC component of input- side alternating current is too 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 SOLIVIA AP G3 (older single-phase) · Guide only. All work must be done by a licensed electrician.	SOLIVIA AP G3 (older single-phase)	Inverter
Error # 301Warning	Error # 301 Internal communication error or hardware fault. 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 SOLIVIA AP G3 (older single-phase) · Guide only. All work must be done by a licensed electrician.	SOLIVIA AP G3 (older single-phase)	Inverter

Common Delta questions

What does Delta Equipment fault. "Equipment fault." mean?

Internal or external fault (interrupted feed). See also display messages! 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 Delta General error condition. "General error condition." mean?

Solar inverter is not connected to the grid. No power is delivered. See also display messages! 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 Delta DC injection failure "DC injection failure" mean?

DC component of input- side alternating current is too high. 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 Delta AC frequency failure "AC frequency failure" mean?

Grid frequency overshoo- ting or undershooting specified limit range. This is caused by the mains frequency moving outside the allowed range, usually briefly This is a guide only; any electrical work must be done by a licensed electrician.

What does Delta AC voltage failure "AC voltage failure" mean?

Grid voltage overshooting or undershooting specified limit range. This is usually caused by the mains supply, not the solar system 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.

Delta SOLIVIA 5.0 AP G3 Operation and Installation Manual, display messages

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

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