The Complete Guide To Omnik Inverter Error Codes

Why an Omnik error code is worth sorting now

An Omnik or Trannergy inverter showing a fault has, in most cases, stopped supplying your home. All that daylight power then comes from the grid at full price instead. An Isolation Fault or Ground Fault is a safety matter as well: the inverter has found the solar wiring leaking, or close to leaking, to earth.

Omnik has closed down. It went into liquidation in 2021, its monitoring portal closed with it, and there is no support for these inverters now. They were a smaller fleet, installed between 2011 and 2016, and a serious fault inside one usually means replacing it. Plenty of Omnik messages are not that serious. Utility Loss is often a tripped solar supply main switch or a blackout, and the grid range faults clear on their own.

Getting it checked soon costs you less in lost generation than waiting. If the inverter has reached its end, the panels usually stay and a hybrid in its place can take a battery now or later. If the fault is in the roof wiring, finding it early stops a damp connector shutting the system down again and again.

Find your code in the table below to see what it means and how urgent it is. If your home is in Adelaide, the Adelaide Hills, Gawler, the Barossa, the Fleurieu, Murray Bridge and Yorke Peninsula in South Australia, or North Brisbane, Caboolture, Bribie Island, the Sunshine Coast, Noosa and Gympie in Queensland, our own licensed electricians will go through it with you over the phone for free before anyone drives out. Check your postcode to see if we cover you.

Which Omnik inverter do you have?

The model is on the label on the side of the unit: Omnik units say Omniksol, Trannergy units start with PVI. The old Omnik portal cannot help, because it has closed.

Omniksol-1k to 3k-TL2: the Omnik range. Its screen shows numbered error codes, such as 14 for over temperature or 22 for an isolation fault.
Trannergy PVI 1800 to 5400TL: the Trannergy range, which shows short messages like Utility Loss, Isolation Fault or Relay-Check Fail. The table uses these names.

All 20 Omnik error codes, explained

Trannergy screens show a fault as a short message, like Utility Loss or Bus Voltage Fault, while the Omniksol TL2 shows a number, such as error 22 or error 14. The table uses the Trannergy names, and the search box finds the Omnik numbers too. All 20 are in one table below. The number in brackets after each code's name is its source in the reference list.

Stop and call A safety or hardware fault that nobody can fix from a phone. Do the one safe restart at most, then call.
Worth a look Something to check or restart safely. If it comes back, book a visit.
Wait and watch The inverter has paused for a reason outside itself, usually the grid or the light, and restarts on its own.

We always err on the cautious side: when a code sits between two ratings, it gets the higher one.

14 stop and call, 1 worth a look, 5 wait and watch.

Error code	What it means	What to do
AC HCT FaultOmnik AC HCT Fault	Output current sensor fault^[1] The sensor that measures the inverter's output current is reading wrong (Omnik screens call it Hole Sense Device Fault). It is an internal hardware fault listed as permanent in the manual. Safe steps in the lookup	Stop and call
Auto Test failOmnik Auto Test fail	Automatic self-test failed^[2] The inverter's grid protection self-test did not pass (Omnik code 16). One restart is worth trying; a repeat means the protection circuit has failed. A failed self-test means the inverter cannot prove its own protection works, so we treat it as a call. Safe steps in the lookup	Stop and call
Bus Voltage FaultOmnik Bus Voltage Fault	DC bus voltage fault^[2] The voltage on the inverter's internal DC bus is too high or too low (Omnik codes 4, 5 and 11). If the string voltage is within range, it is an internal fault. Safe steps in the lookup	Stop and call
Consistent FaultOmnik Consistent Fault	Internal consistency fault^[5] The inverter's two processors disagree on a reading. The manual lists it as a permanent fault: disconnect, wait for the screen to go off, reconnect, and call service if it returns. Safe steps in the lookup	Stop and call
DC INJ HighOmnik DC INJ High	DC injection too high^[1] The inverter is pushing too much direct current into the grid. The manual lists it as a permanent fault: one disconnect and reconnect, then service if it returns. DC on the AC side is a protection fault, so we treat it as a call. Safe steps in the lookup	Stop and call
EEPROM R/W FailOmnik EEPROM R/W Fail	Memory read or write fault^[1] The inverter could not read or write its settings memory. One safe restart sometimes clears it; if it comes back the control board is failing. Internal and hardware faults need testing with the right instruments, so we treat them as a call. Safe steps in the lookup	Stop and call
ENS Grid Voltage FaultOmnik ENS Grid Voltage Fault	Grid monitor (ENS) fault^[2] The inverter's second grid monitor (ENS) tripped on grid voltage, frequency or impedance (Omnik codes 24 to 27). It usually reconnects on its own; the manual's reset is a disconnect and restart if it stays. Safe steps in the lookup	Wait and watch
Fac Over RangeOmnik Fac Over Range	Grid frequency out of range^[1] The mains frequency drifted outside the inverter's limits, so it disconnected. It reconnects by itself once the grid settles; only frequent repeats need a look. Safe steps in the lookup	Wait and watch
Fan FaultOmnik Fan Fault	Cooling fan fault^[2] The cooling fan has stopped or its circuit has failed (Omnik code 19). The inverter can keep running at reduced power but will overheat on hot days. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call. Safe steps in the lookup	Stop and call
GFCI FailureOmnik GFCI Failure	Earth fault detector failure^[1] The circuit that watches for current leaking to earth has itself failed. The inverter will not run without it, and it is an internal fault. Safe steps in the lookup	Stop and call
Ground FaultOmnik Ground Fault	Earth leakage current too high^[7] Current is leaking to earth above the inverter's limit (Omnik screens call it Current Fault). That points to a wet or damaged part of the DC side or a fault on the AC side near the inverter. Safe steps in the lookup	Stop and call
Isolation FaultOmnik Isolation Fault	Insulation (isolation) fault^[9] The inverter measured too little insulation between the solar array and earth (the manual wants more than 2 megohms). Water in a roof connector, a damaged cable or an AC wire touching earth are the usual causes, and the unit stops until it is cleared. Safe steps in the lookup	Stop and call
No displayOmnik No display	No display, no lights^[3] The inverter has no power at all. On a sunny day that means the supply has been cut by a tripped switch or isolator, or the inverter's own power supply has failed, which on a Trannergy or Omnik is the end of the unit. Best effort · from a secondary copySafe steps in the lookup	Worth a look
Over TemperatureOmnik Over Temperature	Inverter over temperature^[1] The inside of the inverter got too hot, so it cut back or stopped. Blocked airflow or a hot mounting spot in full sun is the usual cause. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call. Safe steps in the lookup	Stop and call
Portal not workingOmnik Portal not working	Omnik portal is gone^[4] Omnik went into liquidation in April 2021 and shut its monitoring portal, so the Omnik portal and app will never reconnect. The inverter itself can still be working fine: read its screen in daylight. Loggers that were on the Omnik portal were moved to the Solarman platform, where the old login may still work. Best effort · from a secondary copySafe steps in the lookup	Wait and watch
PV Over VoltageOmnik PV Over Voltage	Solar array voltage too high^[1] The voltage from the panels is at or above the inverter's maximum DC input (500 V on these units). It can show on a cold bright morning on a system wired close to the limit; if it keeps appearing the strings need checking. Over-voltage, over-current and short-circuit faults can damage hardware, so we treat them as a call. Safe steps in the lookup	Stop and call
Relay-Check FailOmnik Relay-Check Fail	Output relay failure^[6] The relay that connects the inverter to the grid has failed its self-test (Omnik screens show Relay1 Fault or Relay2 Fault, codes 30 and 29). It is an internal hardware fault and the unit stays off. Safe steps in the lookup	Stop and call
SCI FailureOmnik SCI Failure	Internal communication fault^[8] The processors inside the inverter have stopped talking to each other. It is an internal board fault; a disconnect and reconnect is the only reset and it rarely holds. Safe steps in the lookup	Stop and call
Utility LossOmnik Utility Loss	No grid detected^[1] The inverter cannot see the mains. A tripped solar supply main switch, a blackout, a blown fuse or a damaged AC cable are the usual causes; the manual adds that if the grid is fine the inverter's internal fuse may have blown. Safe steps in the lookup	Wait and watch
Vac Over RangeOmnik Vac Over Range	Grid voltage out of range^[1] The mains voltage at the inverter went outside its limits, most often too high on a sunny afternoon, so it disconnected. It reconnects on its own; daily repeats mean the grid voltage or the AC cable needs checking. Safe steps in the lookup	Wait and watch

Got an Omnik error code? Free phone diagnosis in our service area

Our own licensed electricians cover Greater Adelaide and regional SA, and from North Brisbane up through the Sunshine Coast to Gympie. Check your postcode, then read us the code and tell us the install year. If it needs a visit, the callout is credited against the work.

How to reset an Omnik inverter safely

Try one restart, in this order:

Switch the solar supply main switch off at the switchboard.
Switch the DC isolator off at the inverter.
Wait five minutes.
Switch the DC isolator back on, then the solar supply main switch.

Never open the unit or touch the wiring. Never restart anything that smells hot or shows scorch marks. If the code comes back after one restart, stop and call.

Omnik inverter repair or replacement?

On a visit our electricians test the whole system first: insulation resistance on every string, earth continuity, the relay, DC string voltages and currents, the AC supply and whatever the screen is showing. An Isolation Fault on these units means the insulation between the array and earth has dropped below what the manual allows. Water in a roof connector, a damaged cable or an AC wire touching earth are the usual causes, and none of them is a reason to replace the inverter.

A Relay-Check Fail, SCI Failure or Bus Voltage Fault that keeps returning is a different story: it is the inverter's own hardware, and with Omnik gone there is nothing to repair it with. In that case we price a straight replacement and a hybrid next to each other, and the hybrid lets a battery go in now or later. The panels usually stay, and the callout comes off whichever you choose.

We do this work in Adelaide, the Adelaide Hills, Gawler, the Barossa, the Fleurieu, Murray Bridge and Yorke Peninsula in South Australia, or North Brisbane, Caboolture, Bribie Island, the Sunshine Coast, Noosa and Gympie in Queensland only. Outside those areas, everything above still applies: take the code, its meaning and the urgency to a licensed electrician near you.

Where these Omnik error codes come from

Every Omnik code on this page was read from the maker's own manual wherever one survives (90 per cent of them). Where only a secondary copy survives, the row says "best effort" and so does the lookup. The numbers match the references in the code table.

[1]
Trannergy PVI 1800 to 5400TL User Manual (3.4 Fault mode) and Omnik Omniksol TL2 User Manual V1.09 codes, from the maker's own document
[2]
Omnik Omniksol-1k to 3k-TL2 User Manual V1.04 codes, from the maker's own document
[3]
Brand-level row. Trannergy PVI 1800 to 5400TL User Manual 7.2 Troubleshooting gives the owner checklist (AC isolation switch, grid available, PV voltage above 125 V)1 code, best effort, from a secondary copy
[4]
Omnik portal shutdown notice hosted by SolarMan (liquidation, server fees unpaid, platform closed, data migrated to SolarMan) and the Homey-SolarPanels GitHub issue 148 on the migration1 code, best effort, from a secondary copy
[5]
Trannergy PVI 1800 to 5400TL User Manual1 code, from the maker's own document
[6]
Trannergy PVI 1800 to 5400TL User Manual (3.4 Fault mode, permanent faults) and Omnik Omniksol TL2 User Manual V1.01 code, from the maker's own document
[7]
Trannergy PVI 1800 to 5400TL User Manual (3.4 Fault mode) and Omnik Omniksol TL2 User Manual V1.0 (9 Troubleshooting1 code, from the maker's own document
[8]
Trannergy PVI 1800 to 5400TL User Manual (3.4 Fault mode) and Omnik Omniksol TL2 User Manual V1.0 (SCI Lose)1 code, from the maker's own document
[9]
Trannergy PVI 1800 to 5400TL User Manual (3.4 Fault mode) and Omnik Omniksol-1k to 3k-TL2 User Manual V1.0 (9 Troubleshooting1 code, from the maker's own document

Tables last updated 21 October 2026

Omnik error code questions, answered

How do I read an Omnik error code?

Check the screen in daylight. A Trannergy shows words, so copy them exactly; an Omnik may show a number, like error 9 or error 30, so note the number. Either one goes into the search box above the table.

What does Omnik Isolation Fault mean?

Isolation Fault is “insulation (isolation) fault”. The inverter measured too little insulation between the solar array and earth (the manual wants more than 2 megohms). Water in a roof connector, a damaged cable or an AC wire touching earth are the usual causes, and the unit stops until it is cleared. We rate it stop and call. See it in the table.

What does Omnik Utility Loss mean?

Utility Loss is “no grid detected”. The inverter cannot see the mains. A tripped solar supply main switch, a blackout, a blown fuse or a damaged AC cable are the usual causes; the manual adds that if the grid is fine the inverter’s internal fuse may have blown. We rate it wait and watch. See it in the table.

Do you cover my area?

We work in Adelaide, the Adelaide Hills, Gawler, the Barossa, the Fleurieu, Murray Bridge and Yorke Peninsula in South Australia, or North Brisbane, Caboolture, Bribie Island, the Sunshine Coast, Noosa and Gympie in Queensland. Check your postcode to be sure. Outside those areas, this page still tells you what your code means and how urgent it is, and a licensed electrician near you can take it from there.

What does it cost to have an Omnik looked at?

For homes in our service area, the phone diagnosis is free. If it needs a visit, there is a callout fee, and it is credited against any repair or replacement we do.

Will you work on an Omnik you did not install?

Yes, if it is in our service area. Most of our repair work is on systems someone else installed. We test the whole system, not just the unit on the wall.

Why has the Omnik portal stopped working?

Omnik went into liquidation in April 2021 and shut its monitoring portal, so it will not come back. Loggers that were on the Omnik portal were moved to the Solarman platform, and your old login may still work in the Solarman app. If it does not, the inverter itself can still be fine: check its screen in daylight for a Normal state and a power reading.

Is Trannergy the same as Omnik?

We list them together because their manuals line up: most Trannergy messages on this page match an Omnik error number for the same fault. Both are defunct with no support, so the advice is the same for either.

Where do the codes on this page come from?

From the makers’ own documents wherever they survive: the Trannergy PVI 1800 to 5400TL user manual and the Omnik Omniksol TL2 user manual. Two rows, the blank screen and the closed portal, come from secondary sources and say best effort. The bracketed number on each row points to its document in the source list.

Written by

Joe Deionno

Started in 2017 after years of subcontracting and seeing the dodgy operators at work; set out to be the installer people could trust. Oversees every install in both states.

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