The Complete Guide To Growatt Inverter Error Codes

The grid frequency has drifted outside the allowed band, so the inverter has paused. This is a network event, not a fault in the inverter, and it clears on its own.

The mains voltage at your house has gone outside the band the inverter is allowed to run in, so it has paused. On sunny days with lots of solar in the street this is common and clears itself.

Code 124 is how older Growatt units log No AC Connection: the inverter cannot see mains power. Usually a tripped solar supply main switch, a street outage or a loose AC connection.

The mains voltage has gone outside the band the inverter is allowed to run in (shown as AC V Outrange), so it has paused. Common on sunny days in streets with lots of solar, and it clears itself.

The inverter cannot see mains power on its AC side (shown as No AC Connection). Usually a tripped solar supply main switch, a street outage or a loose AC connection.

The grid frequency has drifted outside the allowed band (shown as AC F Outrange), so the inverter has paused. It is a network event and clears on its own.

The inverter cannot see mains power on its AC side. Usually a tripped solar supply main switch, a power outage in the street, or a loose AC connection.

The surge protection device on the inverter's DC side has reported a problem, often after a storm has used it up. The inverter keeps running but has lost that protection until the device is replaced. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter cannot see mains power. Usually a tripped solar supply main switch, a power outage or a loose AC connection.

The mains voltage has gone outside the band the inverter is allowed to run in, so it has paused. Common on sunny days in streets with lots of solar, and it clears itself.

The grid frequency has drifted outside the allowed band, so the inverter has paused. It is a network event, not an inverter fault, and clears on its own; Error 302 on the same units means no AC connection instead.

On Australian three-phase units this is a drive fault in the power stage; the US single-phase manual uses 111 for neutral-to-earth voltage being too high. Either way the inverter has stopped and needs an electrician.

The voltage from the panels is above the inverter's maximum (shown as PV Voltage High). Growatt says to disconnect the DC switch straight away and have the string checked; it is usually too many panels in one string.

The inverter has found its AC terminals wired the wrong way round. This is an installation fault and must be corrected by an electrician.

On a hybrid unit, the appliances on the backup circuit are drawing more than the inverter can supply. Reducing the load clears it; if it happens with little running, book a visit.

The inverter's output has a DC offset it should not have. Growatt says restart first; if it stays, the output stage or its sensing needs a look. DC on the AC side is a protection fault, so we treat it as a call.

The inverter's DC side voltage is too high and it has stopped to protect itself. Growatt's MOD manual says restart once, then contact them; Warning 401 on the same units is the meter warning, which is minor.

The inverter found too much DC mixed into the AC power it sends to the grid (shown as Output High DCI). A one-off is usually a grid blip; if it keeps coming back the output stage needs a look. DC on the AC side is a protection fault, so we treat it as a call.

On a three-phase inverter the current on the three phases is out of balance, which can be a grid or wiring issue or a fault in the output stage. An electrician needs to check which.

A fault in the drive for the inverter's main power switches, which is a board-level failure. The inverter has stopped and needs a technician.

The inverter found too much DC mixed into the AC power it sends to the grid. A one-off is usually a grid blip; if it keeps coming back the output stage or its sensing needs a look. DC on the AC side is a protection fault, so we treat it as a call.

The voltage coming from the panels is above what the inverter can take, which happens when too many panels are in one string, especially on cold clear mornings. Growatt says to switch the DC isolator off straight away and have it checked.

The inverter has found a short circuit on one of its solar inputs, usually a wiring or connector fault or reversed polarity. This needs an electrician; do not keep restarting it.

The boost circuit on one of the solar inputs has failed, so that string is not producing. Growatt's manual points to a power board replacement.

A fuse on one of the solar inputs has opened, so that string is not producing. Fuses blow for a reason, so the string needs checking before the fuse is replaced.

The voltage from the panels is above the inverter's maximum, usually too many panels in a string on a cold morning. Growatt says to disconnect the DC switch straight away and have the string checked.

One of the solar inputs is wired with the polarity reversed. This is an installation fault and needs an electrician to correct it.

The boost module on the inverter's solar input has reported a fault. Growatt says restart once; if it stays, it is a board fault.

The inverter detected an electrical arc in the solar DC wiring and shut down. Arcing is a fire risk, so leave the system off and have it inspected.

The inverter's arc-fault detection module failed its own self-check, so the inverter will not run without that protection. This is an internal fault.

The circuit that watches for current leaking to earth has failed its check, so the inverter will not run without that protection. This is an internal fault.

Code 125 is how older Growatt units log PV Isolation Low: the insulation between the solar DC wiring and earth is too low. Usually moisture in a connector or isolator, a damaged cable or a faulty panel.

The inverter detected an electrical arc in the solar DC wiring, sounded its buzzer and shut down. Arcing is a fire risk, so leave the system off and have it inspected rather than resetting it.

The inverter detected current leaking to earth and tripped (shown as Residual I High on the screen). It usually points to moisture or damage in the DC wiring or panels, or an AC neutral or earth problem.

The insulation between the solar DC wiring and earth is too low (shown as PV Isolation Low). Usually moisture in a connector or isolator, a damaged cable or a faulty panel; the inverter will not connect until it is fixed.

The inverter measured more than 30 volts between neutral and earth, which means a problem with the earth or neutral connection somewhere in the installation. This is a safety fault for an electrician.

The circuit that watches for current leaking to earth has reported a fault, so the inverter will not run without that protection. Growatt says restart once, then contact them.

The inverter's arc-fault detection failed its own self-check, so the inverter will not run without that protection. Growatt says restart once, then contact them.

The inverter measured too little insulation between the solar DC wiring and earth, usually moisture in a connector or isolator, a damaged cable or a faulty panel. It will not connect until this is fixed.

The inverter detected current leaking to earth that should not be there, which is a safety trip. It usually points to moisture or damage somewhere in the DC wiring or panels, or an AC neutral or earth problem.

The inverter's temperature sensor reads too hot and it has stopped to protect itself. Growatt says to restart once the surroundings are below 60 degrees; if it keeps happening the fan or airflow needs a look. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The inverter's temperature sensor is not connected properly or has failed, so it cannot protect itself from overheating and has stopped. This is an internal fault.

The inverter has got hotter than it is allowed to run and has wound back or stopped to protect itself. It restarts on its own once it cools. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The inverter's cooling fan is not running properly. It keeps producing but will run hotter and may wind back on warm days until the fan is replaced. A fan fault lets the inverter overheat, so we treat it as a call.

The inverter's cooling fan is not running properly. It keeps producing but will run hotter and wind back on warm days until the fan is replaced. A fan fault lets the inverter overheat, so we treat it as a call.

The inverter runs a self-test of its grid protection when it starts and this one did not pass, usually because the grid was unstable at the time. A restart repeats the test. A failed self-test means the inverter cannot prove its own protection works, so we treat it as a call.

An internal reference voltage on the control board is out of range, so the inverter cannot trust its own measurements and has stopped. This is a board fault, not something in your wiring.

The two processors inside the inverter have stopped talking to each other. A restart often clears a one-off; if it comes back, a board needs attention. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The two processors inside the inverter took different readings of the grid, which Growatt says is usually caused by the grid voltage or frequency changing quickly. A restart clears it; if it keeps happening the grid supply needs checking. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The settings memory on the control board has failed. Growatt's manual says to contact them; it is a board repair rather than something a restart fixes.

The relay that connects the inverter to the grid failed its check (Growatt's guide says after six failed attempts). The inverter stays disconnected until the relay or its board is repaired.

The inverter could not load its model settings when it started, so it will not run. This is an internal fault that Growatt says to refer to them.

The sensor that measures the inverter's output current has failed, so the inverter cannot run safely. This is an internal fault.

The main processor stopped receiving data from the communication board. Growatt says to restart first; if it keeps happening the board needs attention. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The voltage on the inverter's internal DC bus is out of range (too high on the three-phase units). The inverter has stopped to protect itself and the cause is inside the unit or in the string configuration.

The inverter cannot measure its internal DC bus voltage properly, so it has stopped. This is an internal fault; Growatt says restart once, then contact them.

The relay that connects the inverter to the grid failed its check, so the inverter stays disconnected. Growatt says restart once, then contact them; it is usually a relay or board repair.

The inverter's start-up self-test of its grid protection did not pass (shown as Auto Test Failed), usually because the grid was unstable at the time. A restart repeats the test. A failed self-test means the inverter cannot prove its own protection works, so we treat it as a call.

The voltage on the inverter's internal DC bus went too high and it has stopped to protect itself. This can be a string configuration issue or a fault inside the unit.

The inverter's main processor and its communication board have stopped talking. Growatt says to check the solar connections on a new install, restart, and if it stays they update the firmware. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter had a fault with its settings memory. Growatt says restart first; if it keeps coming back the control board needs a look. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter could not read its settings memory properly. It usually clears with a restart; if it keeps appearing the control board needs a look. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter could not save to its settings memory. A restart usually clears it; if it keeps coming back the control board needs a look. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter had trouble with its settings memory. A restart usually clears it; if it keeps coming back the control board needs a look. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter's two processors disagree on a safety measurement (on later three-phase units the leakage current reading), so it has stopped. This is an internal fault.

The inverter could not load its model settings when it started. Growatt's manual calls for a mode reset by a technician; it is not something a home restart fixes.

The inverter's two processors took different readings of the same measurement. A restart clears a one-off; if it keeps happening a board needs attention.

The two processors inside the inverter are running firmware that does not match. It needs a firmware update from Growatt or an installer rather than anything you can do at home.

The inverter has lost contact with its energy meter (used for export limiting or battery control), so it may be holding back output. The meter needs to be powered and connected; the solar itself is fine.

The two processors inside the inverter are running firmware that does not match and it needs an update from Growatt or an installer. (Error 405 on the same units is a relay fault, which is more serious.) A relay fault can leave the inverter unable to disconnect safely, so we treat it as a call.