The Complete Guide To SolarEdge Inverter Error Codes

The voltage between active and neutral at the inverter went above or below the limit, so it disconnected. It reconnects itself; if it repeats, the AC connections and the grid supply need checking.

The grid voltage at the inverter is above the Australian limit, so it disconnected to protect the grid. It reconnects itself when the voltage drops; it is common on sunny afternoons in streets with a lot of solar, and if it repeats daily the cable run or the network needs looking at.

The inverter saw a sudden surge in ground current or AC current, which usually comes from the grid side, such as a nearby large load switching or a network event. SolarEdge says to check the AC connection and ask the network about surge sources; if the grid is fine and it keeps happening, support needs to look at the inverter. Anything to do with earth or leakage current is a safety fault, so we treat it as a call.

The grid voltage at the inverter dropped below the limit, so it disconnected. This is usually a dip on the network, a blackout or a tripped solar breaker, and the inverter reconnects itself when the voltage returns.

The grid frequency went above or below the allowed band, so the inverter disconnected. This comes from the network, not your system, and the inverter reconnects itself when the frequency is back in range.

The grid voltage spiked above the inverter's limit for a moment and it disconnected to protect itself. One-offs are normal; if it keeps happening the AC cable may be undersized for the run or the street voltage is high.

SolarEdge's published lists have no code 3x60. Its 3x codes are communication and lock-out conditions (the inverter locked itself and needs an OFF/ON to reconnect), and the similar-looking 18x60 means the grid is down and the inverter restarts itself when power returns. Note the exact code and description on the screen; one restart is safe, and if it returns an installer needs to read the log.

The inverter has no grid country setting, or the wrong one, so it will not connect. Nothing is broken; the installer selects the Australian setting through SetApp or the LCD.

On HD-Wave inverters 18x37 and 18x38 are the grid voltage trips, one for too low and one for too high. The inverter disconnects to protect the grid and reconnects itself when the voltage settles; if it repeats most days the cable run or the network supply needs checking.

The 18x40 to 18x5D codes on HD-Wave inverters all mean the grid frequency measured on a phase was higher or lower than the allowed band. It is a network condition; the inverter reconnects itself, and SolarEdge's only on-site steps are to confirm the country code and the grid frequency.

The inverter has lost the grid, either a blackout, a tripped solar breaker or an islanding trip where it detected it was alone on the line. It restarts itself after the reconnection time once the grid is back; nothing is wrong with the inverter.

The DC voltage into the inverter went above its limit. The optimisers normally stop this, so if it persists a string or optimiser is misbehaving and SolarEdge's steps involve isolating strings, which is a job for an electrician.

The inverter is in night mode because it is getting less than 6 volts from the panels, which is normal after dark and before sunrise. If it shows in the middle of a clear day, the DC side is not delivering and needs testing.

The inverter could not pair with all of its optimisers. SolarEdge's first cause is shade on the panels during pairing, and the others are a disconnected or faulty optimiser, so if a retry in full sun does not work the installer needs to check the string.

The sensor that watches for current leaking to earth has failed inside the inverter, so it cannot protect the system and has stopped. This is an internal fault for SolarEdge support, not a panel problem.

Every time it starts, the inverter checks the insulation between the solar DC wiring and earth, and it found less than 600 kilo-ohms. That means DC is leaking to earth somewhere, usually moisture in a connector or optimiser, a damaged cable or a faulty panel. It is a safety trip: do not keep resetting it, the string has to be tested and the leak found.

The inverter's arc fault detector could not pass its own test, so it cannot protect the DC wiring from arcing. SolarEdge points to its arc detection application note; an installer needs to check the detector and the DC side. A failed self-test means the inverter cannot prove its own protection works, so we treat it as a call.

The inverter's residual current protection tripped because current is leaking from the solar wiring to earth, which means the insulation to earth is not good enough somewhere. SolarEdge says only a qualified technician should handle this, connecting one string at a time to find the faulty one.

SolarEdge's current error list says 3x9A means the inverter has locked itself, either because someone switched it off or because one of its safety features tripped, and it needs an OFF/ON to reconnect. Some trade websites call 3x9A an isolation fault, but that is not what SolarEdge publishes; if a restart does not clear it, an installer has to find out from the log why it locked. Insulation faults are a safety fault, so we treat them as a call.

On HD-Wave inverters 18x3D and 18x3E are the residual current trips: current is leaking from the solar wiring to earth faster or further than allowed. SolarEdge's instruction is to contact support, and the DC side needs testing before anyone resets it.

On SetApp inverters 18x86 is the isolation fault: the inverter measured less than 600 kilo-ohms between the solar DC wiring and earth, so DC is leaking to earth, usually from moisture in a connector or optimiser, a damaged cable or a faulty panel. It often comes and goes with morning dew, which is why it should be tested while it is showing rather than reset.

The inverter detected an electrical arc in the solar DC wiring, which is a fire risk, and has shut down. Do not reset it; the DC connectors, optimiser leads and cables need to be inspected and tested first.

The inverter has shut down because it is too hot. SolarEdge says to check the clearances around it and that the heat-sink fins are clean, but an inverter that keeps overheating usually has a cooling or mounting problem that needs a technician.

The inverter's internal temperature sensor is broken or disconnected, so it cannot protect itself from overheating. SolarEdge's instruction is to contact support; it is an internal fault for a technician.

Trade guides list 18x75 as the HD-Wave inverter shutting down because it is too hot; it does not appear in SolarEdge's own published error lists. An inverter that overheats more than once has a cooling or mounting problem that needs a technician. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

A cooling fan in the inverter has failed. It usually keeps producing but will run hot and may start cutting its output, so the fan should be cleaned or replaced by a technician before summer. A fan fault lets the inverter overheat, so we treat it as a call.

The relay that connects the inverter to the grid has failed its check, so the inverter cannot safely connect. This is an internal fault; SolarEdge's instruction is to contact support.

The inverter has found a fault in its own hardware, such as its internal voltage reference or power stage, and stopped. SolarEdge's instruction is to contact support for a warranty claim, so it needs a technician to log it; it is not a panel or wiring problem.

SolarEdge's published lists have no single-phase code 3x1A. The closest documented codes are 2x1A (a faulty AC relay inside the inverter, a technician job) and 33x1A (an AC voltage surge on a commercial inverter); one trade website calls 3x1A grid voltage out of range. Note the exact code and the description under it on the screen, and if it keeps coming back have an electrician check it. A relay fault can leave the inverter unable to disconnect safely, so we treat it as a call.

The inverter's main controller has lost contact with its internal digital board or hit a software error. SolarEdge's instruction is to contact support; it needs a technician to log it and check whether a firmware upgrade or replacement is needed.

The inverter has locked itself out, either because someone switched it off or because a safety feature tripped, and it needs an OFF/ON to reconnect. SolarEdge says the installer needs to know why it locked in the first place, so if it happens again after a restart, book a visit. A protection lockout means the inverter found something it will not run with, so we treat it as a call.

On HD-Wave inverters the 18xA6 to 18xAB codes are hardware errors, including an overvoltage on the DC input. SolarEdge's instruction is to check the string voltage and contact support, so it needs a technician.

The inverter has measured an overvoltage inside its own power stage, which on HD-Wave units points to a failed internal component. SolarEdge lists it as a warranty (RMA) matter: contact support, so it needs a technician to log the serial number; it is not a panel or grid problem.

SolarEdge publishes no code that is just 3x6. The codes that start this way are 3x6A (the inverter locked itself, by a switch-off or a safety feature, and needs an OFF/ON to reconnect), 3x6D (an error in the built-in energy meter) and 3x6E (the inverter cannot talk to its meter). None is a wiring hazard, but if a restart does not clear it an installer has to find out why it locked. A protection lockout means the inverter found something it will not run with, so we treat it as a call.

The inverter cannot talk to its energy meter (3x6E), or the built-in meter has an internal error (3x6D). Solar production is not affected, but export limiting and consumption data may be wrong until the meter wiring or settings are fixed. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

SolarEdge's published error lists have no code 3x14; the 3x family covers communication and lock-out conditions, and the nearest listed code, 3x114, means the inverter has locked itself and needs an OFF/ON to reconnect. Treat it as a lock-out: one restart is safe, and if it returns an installer needs to read the log.

On older single-phase SolarEdge inverters (firmware 3.18 and earlier) error numbers 4, 5, 8, 18 to 23, 39, 42, 45 and 48 are all the same thing: a software or internal fault, and SolarEdge's only instruction is to contact support. It needs a technician to log the serial number and error with SolarEdge; it is not a grid or panel problem.

Error 18 (and 19 to 23) on the older single-phase inverters is a software or internal fault; on newer firmware the same fault shows as 2x13, 2x15, 2x16 or 2x2D. SolarEdge's instruction is to contact support, so it needs a technician rather than a reset.

The inverter cannot reach the SolarEdge monitoring server, so the app shows it offline and S_OK is missing from the status screen. Production is usually fine; it is almost always the home wifi or router, a changed password or an unplugged cable.

The inverter status shows fewer optimisers reporting than are installed (P_OK with x less than y), or the monitoring shows a panel with no data. One optimiser missing around dawn or dusk is usually shade; one missing all day, or several at once, means an optimiser, its connector or its panel has a fault, and that is a roof job.