Inverter Error Codes

The table below lists inverter error codes you may see on your solar system.

You will notice that a lot of the codes are due to grid voltage variations which the inverter responds to. There is no fault with these and nothing to be done until the grid voltage normalises.

Many old cheap inverters break and cannot be fixed. EnviroGroup runs a dedicated service department, and we may be able to assist in resolving your inverter issue and get you back up and running again.

Book a solar service today and we will send one of our licensed solar electricians to make an assessment of your system.

Sungrow Inverter Codes

Code	Meaning	What to do?
2	The grid voltage exceeds inverter allowable upper limit.	Check the grid voltage and connection on the inverter. If the voltage is outside the tolerance range, ask your utility grid supplier for a solution. If the voltage is within the tolerance range and the error code remains, contact us for an inspection.
3	Grid transient voltage exceeds the permissible range.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
4	The grid voltage is below inverter’s allowable lower limit.	Check the grid voltage and connection on the inverter. If the grid voltage exceeds the permissible range of inverter protection parameters, ask the utility grid company for a solution. If the grid voltage is within the permissible range. If code continues to appear, contact us for an inspection.
5	The grid voltage is too low.	This is a short-term fault due to grid conditions. Inverter should fix itself. If the fault still appears, contact EnviroGroup.
6	The AC output current exceeds inverter allowable upper limit.	Wait for the current to fall below the protection value. If this code is consistently displayed, contact EnviroGroup for a consultation
7	Transient AC ocercurrent.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
8	The grid frequency exceeds inverter allowable upper limit.	Check the grid frequency and connection on the inverter. If the frequency is outside the tolerance range, ask your utility grid supplier for a solution. If the frequency is within the tolerance range and the error code remains, contact us for an inspection.
9	The grid frequency is below the inverter allowable lower limit.	Check the grid frequency and connection on the inverter. If the frequency is outside the tolerance range, ask your utility grid supplier for a solution. If the frequency is within the tolerance range and the error code remains, contact us for an inspection.
10	Islanding.	Check whether AC circuit breaker is triggered. Check whether AC cables are all firmly connected. Check whether grid is not in service. If all conditions are okay and this fault still occurs in the LCD screen, contact EnviroGroup for a consultation.
11	The DC component of AC current exceeds inverter limit.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
12	A failure current is detected.	Call EnviroGroup to check your system for ground faults.
15	The grid voltage exceeds the permissible range.	The inverter will automatically attempt to correct this error. Check the AC cable. Check the grid frequency and connection on the inverter. If the voltage is outside the tolerance range, ask your utility grid supplier for a solution. If the voltage is outside the tolerance range and the error code remains, contact EnviroGroup for a consultation.
16	The bus voltage or power is high.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
20	The bus voltage is high.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
21	PV1 input overcurrent is detected.	Contact EnviroGroup for a consultation.
22	PV2 input overcurrent is detected.	Contact EnviroGroup for a consultation.
36	The temperature of radiator is too high.	Check whether the inverter operating ambient temperature is more than the range indicated in the specification. Check whether the AC output power exceeds the nominal power. If the fault still exists, please contact EnviroGroup.

37	The internal temperature of inverter is too high	Check whether the inverter operating ambient temperature is more than the range indicated in the specification. Check whether the AC output power exceeds the nominal power. If the fault still exists, please contact EnviroGroup.
38	Relay fault is detected	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
39	The insulation resistance is low. (ISO-flt)	Check whether the positive and negative of PV panels is short-circuited with ground lead. Wait a moment for inverter recovery. If the fault occurs repeatedly, contact EnviroGroup .
41	Leakage current self-test abnormality	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
47	The PV configuration mode set in the phone application interface is not in accordance with the configuration in the connection cabinet.	Disconnect the inverter. Re-select PV configuration mode and re-connect PV strings. If the error persists, contact EnviroGroup for a consultation.
48	Sampling channel failure	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
53	Auxiliary DSP detects grid voltage exceeds set protection value	Check the grid voltage and connection on the inverter. If the voltage is outside the tolerance range, ask your utility grid supplier for a solution. If the voltage is within the tolerance range and the error code remains, contact us for an inspection.
54	Auxiliary DSP detects grid frequency exceeds set protection value	Check the grid voltage and connection on the inverter. If the frequency is outside the tolerance range, ask your utility grid supplier for a solution. If the voltage is within the tolerance range and the error code remains, contact us for an inspection.
56	Auxiliary DSP detects grid leakage current exceeds set protection range	Contact EnviroGroup to check for a ground fault.
57	Auxiliary DSP AC current sampling channel anomaly	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
58	Auxiliary DSP detects AC current DC injection exceeds inverter set protection range	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
59	Main and auxiliary DSP communication anomaly	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
60	Main and auxiliary DSP sampling difference	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
70	Fans are defective	Stop the inverter Disconnect the AC and DC cables Check the fan duct and fans If this code is consistently displayed, contact EnviroGroup for a consultation.
87	Arc self-detection anomaly warn	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
88	Arc anomaly fault	Stop the inverter Disconnect the AC and DC cables Check the fan duct and fans If this code is consistently displayed, contact EnviroGroup for a consultation.
89	Arc detection OFF warn	Remove the warning by enabling arc detection function or keep the warning by closing arc detection function.
100	The AC output current exceeds inverter protection limit.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
101	The grid frequency exceeds inverter allowable upper limit.	Check the grid frequency and connection on the inverter. If the frequency is outside the tolerance range, ask your utility grid supplier for a solution. If the frequency is within the tolerance range and the error code remains, contact us for an inspection.
102	The grid frequency is below the inverter allowable lower limit.	Check the grid frequency and connection on the inverter. If the frequency is outside the tolerance range, ask your utility grid supplier for a solution. If the frequency is within the tolerance range and the error code remains, contact us for an inspection.
106	The inverter is not grounded	Call EnviroGroup to check your system for ground faults.
200	The bus voltage is high.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
201	The bus voltage is too low.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
202	PV current overcurrent	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
205	AC output replay abnormal	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
307	DC power is too high	Contact EnviroGroup for a consultation

Fronius Inverter Codes

Code	Meaning	What to do?
STATE 102	AC voltage too high	Check connection to the grid. If the problem persists, contact EnviroGroup for a consultation or ask your utility grid supplier.
STATE 103	AC voltage too low	Check connection to the grid. If the problem persists, contact EnviroGroup for a consultation or ask your utility grid supplier.
STATE 105	AC frequency too high	Check connection to the grid. If the problem persists, contact EnviroGroup for a consultation or ask your utility grid supplier.
STATE 106	AC frequency too low	Check connection to the grid. If the problem persists, contact EnviroGroup for a consultation or ask your utility grid supplier.
STATE 107	AC grid outside the permissible limits	Check connection to the grid. If the problem persists, contact EnviroGroup for a consultation or ask your utility grid supplier.
STATE 108	Stand alone operation detected	Check connection to the grid. If the problem persists, contact EnviroGroup for a consultation or ask your utility grid supplier.
STATE 112	RCMU error	Check connection to the grid. If the problem persists, contact EnviroGroup for a consultation or ask your utility grid supplier.
STATE 301	Short term interruption due to AC overcurrent.	The fault should automatically be remedied. If the error code persists contact EnviroGroup for service advice.
STATE 302	Short term interruption due to DC overcurrent.	The fault should automatically be remedied. If the error code persists contact EnviroGroup for service advice.
STATE 303	Short term interruption due to power stage set over temperature	Check openings for cooling air and heat sink if necessary; fault is rectified automatically; if this code keeps recurring contact your solar power system installer.
STATE 304	Internal temperature too high	Check vents and cooling system, if the problem persists contact a solar installer
STATE 306	Intermediate circuit voltage too low for feeding energy into the grid	If this code appears even with sufficient sunlight, consult EnviroGroup for a solution. If the code appears early morning/late evening when sunlight is minimal, it is part of routine operations and NOT an indicator of a fault.
STATE 307	DC input voltage too low for feeding energy into the grid	If this code appears even with sufficient sunlight, consult EnviroGroup for a solution. If the code appears early morning/late evening when sunlight is minimal, it is part of routine operations and NOT an indicator of a fault.
STATE 308	Intermediate circuit overvoltage	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 309	DC input voltage MPPT 1 too high	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 311	Polarity of DC strings reversed	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 313	DC input voltage MPPT 2 too high	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 314	Current sensor calibration timeout	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 315	AC current sensor error	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 316	Interrupt Check fail	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 325	Overtemperature in the connection area	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 326	Fan 1 error	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 327	Fan 2 error	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 401	No communication with power stage set possible	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 406	Power stage set temperature sensor faulty	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 407	Internal temperature sensor faulty	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 408	DC feeding into the grid detected	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 412	Fixed voltage mode has been selected instead of MPP voltage mode and the fixed voltage has been set to too low or too high a value	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 415	Safety cut out via option card or RECERBO has triggered. The inverter is not feeding any energy into the grid.	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 416	No communication possible between power stage set and control system	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 417	Hardware ID problem	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 419	Unique ID conflict	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 420	No communication possible with the Hybrid manager	Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 421	HID range error	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 425	No communication possible with the power stage set	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 426-428	Possible hardware fault	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 431	Software problem	Switch the AC circuit breaker off and on. Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 436	One or more PC boards in the inverter are not compatible with each other	The inverter will automatically attempt to correct this error. Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 437	Power stage set problem	The inverter will automatically attempt to correct this error. Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 438	One or more PC boards in the inverter are not compatible with each other	The inverter will automatically attempt to correct this error. Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 443	Intermediate circuit voltage too low or asymmetric	Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 445	Invalid limit value settings	Update the inverter firmware. If this code is consistently displayed after the update, contact EnviroGroup for a consultation. The inverter has disconnected from the grid as a safety measure.
STATE 447	Insulation fault	If this code is consistently displayed after the update, contact EnviroGroup for a consultation. The inverter has disconnected from the grid as a safety measure.
STATE 448	Neutral conductor not connected	If this code is consistently displayed after the update, contact EnviroGroup for a consultation. The inverter has disconnected from the grid as a safety measure.
STATE 450	Guard cannot be found	If this code is consistently displayed after the update, contact EnviroGroup for a consultation. The inverter has disconnected from the grid as a safety measure.
STATE 451	Memory error detected	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 452	Communication error between the processors	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 453	Short term grid voltage error	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 454	Short term grid frequency error	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 456	Anti-islanding function is no longer implemented correctly	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 457	Grid relay sticking	Contact EnviroGroup for a consultation.
STATE 458	Error when recording the measuring signal	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 459	Error when recording the measuring signal for the insulation test	Contact EnviroGroup for a consultation.
STATE 460	Reference voltage source for the digital signal processor (DSP) is working out of tolerance	Contact EnviroGroup for a consultation.
STATE 461	Fault in the DSP data memory	Contact EnviroGroup for a consultation.
STATE 462	Error with DC feed monitoring routine	Contact EnviroGroup for a consultation.
STATE 463	Reversed AC polarity, AC connector inserted incorrectly	Contact EnviroGroup for a consultation.
STATE 472	Fuse for solar panel ground is faulty	Replace fuse for solar panel ground; If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 474	RCMU sensor faulty	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 475	Solar panel ground fault, insulation fault (connection between solar panel and ground)	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 476	Driver supply voltage too low	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 480, 481	One or more PC boards in the inverter are not compatible with each other	The inverter will automatically attempt to correct this error. Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 482	Startup incomplete	Turn the AC circuit breaker off and on. Complete start up.
STATE 483	Voltage UDC fixed on MPP2 string out of limits	Check the MPP settings. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 485	CAN transmit buffer is full	Turn the AC circuit breaker off and on. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 502	Insulation error on the solar panels	Push button on the inverter display. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 509	No energy fed into the grid in the past 24 hours	Push button on the inverter display. Look for any grid feed-in issues. Look out for further error messages.
STATE 515	No communication with filter possible	Push button on the inverter display. Look for any grid feed-in issues. Look out for further error messages.
STATE 516	No communication possible with the storage unit	If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 517	Temperature highs cause power derating	Check vents, cooling, and heat sink. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 518	Internal DSP malfunction	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 519	No communication possible with the storage unit	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 520	No energy fed into the grid by MPPT1 in the past 24 hours	Check voltage & polarity on input 1 of the inverter. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 522	DC1 Input Voltage too low	Check voltage & polarity on input 1 of the inverter. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 523	DC2 Input Voltage too low	Check voltage & polarity on input 2 of the inverter. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 551	Fuse for solar panel ground is faulty	Replace fuse for solar panel ground; If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 558, 559	One or more PC boards in the inverter are not compatible with each other	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 560	High grid frequency has caused derating.	The inverter will automatically attempt to correct this error. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 564	One or more PC boards in the inverter are not compatible with each other	Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 566	Arc detector switched off (e.g. during external arc monitoring)	No error, Confirm status code by pressing ‘Enter’.
STATE 567	Grid Voltage Dependent Power Reduction is active (grid voltage has exceeded 250 Vac)	Acknowledge the error code. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 568	Incorrect input signal on the multifunction current interface	Acknowledge status code; check the devices connected to the multi-function current interface; If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 601	CAN bus is full	Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 603	AC module temperature sensor faulty (L3)	The inverter will automatically attempt to correct this error once the frequency is within a normal range. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 604	DC module temperature sensor faulty	The inverter will automatically attempt to correct this error once the frequency is within a normal range. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 607	RCMU error	Reset status code by pressing ‘Enter’. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 608	One or more PC boards in the inverter are not compatible with each other	Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 668	Incorrect input signal on the multi-function current interface	Check the devices connected to the multi-function current interface; If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 701-716	Provides information about the internal processor status	If this code is consistently displayed, contact EnviroGroup for a consultation.

STATE 705	Conflict when setting the inverter number (e.g. number already assigned)	Correct the inverter number via the setup menu
STATE 721	EEPROM has been reinitialised or EEPROM is faulty	Acknowledge the error code. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 722-730	Provides information about the internal processor status	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 731	Initialisation error – USB stick is not supported	Check or replace USB stick. Check the file system on the USB stick. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 732	Over current on USB stick	If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 733	No USB stick connected	Check the USB is connected. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 734	Update file not recognised or not present	Check update file (e.g. for correct file name). If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 735	Update file does not match the device, update file too old	Update the inverter firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 736	Write or read error occurred	Check USB stick and the data contained on it or replace USB stick. Never unplug a USB stick if the ‘Data Transmission’ LED is still flashing or lit. If this code is consistently displayed, contact EnviroGroup for a consultation
STATE 737	File could not be opened	Remove and then reinsert USB flash drive; check or replace USB flash drive

STATE 738	USB stick is write protected or full	Create storage space, remove write protection, check or replace USB stick if necessary. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 740	Initialisation error on USB flash drive	Check USB flash drive; reformat on PC for FAT12, FAT16 or FAT32.
STATE 741	Error during recording of logging data	Remove and then reinsert USB flash drive; check or replace USB flash drive
STATE 743	Error occurred during update process	Repeat the update process, check USB stick. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 745	Update file corrupt	Download the latest firmware. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 746	Error occurred during update process	Wait for 2 minutes, then start the update again. If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 751	Time lost	Reset the time and date on the inverter. Check update file (e.g. for correct file name). If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 752	Communication error with real-time clock module	Reset the time and date on the inverter. Check update file (e.g. for correct file name). If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 753	The real-time clock module is in emergency mode	Reset the time and date on the inverter. Check update file (e.g. for correct file name). If this code is consistently displayed, contact EnviroGroup for a consultation.
STATE 754-755	Information about the processors status	If this code is consistently displayed, contact EnviroGroup for a consultation.

Enphase Inverter Codes

Note: If all LEDs continue to flash red for longer than 30-60 minutes, then try to power cycle (turn off and turn on) the gateway once.

If the issue persists, then click call EnviroGroup for a service.