Fault Code Reference

Growatt Fault Codes

Growatt string and hybrid inverters. One of the best-selling inverter brands in the UK market, covering SPH, MIN, and MOD series products.

58
Fault codes
Device types covered
Inverter (58)

Common fault codes

Error 200
AFCI — Arc Fault Detected
Inspect all MC4 connectors and DC cable runs for burn marks or carbonisation. Ch…
Error 201
Leakage Current High
Test insulation resistance of each string independently (500 V DC IR test). Belo…
Error 202
PV Voltage Too High
Measure Voc of each string before sunrise (coldest condition). Compare to invert…
Error 203
PV Isolation Low (RISO)
Disconnect all strings. IR test each string at 500 V DC — any reading below 1 MΩ…
Error 300
AC Voltage Out of Range
Measure AC voltage at inverter terminals. Check ShinePhone for voltage history. …
Error 302
No AC Connection
Check AC isolator and consumer unit MCB. Confirm grid present with voltage teste…

All Growatt fault codes

Error 200
AFCI — Arc Fault Detected
Inspect all MC4 connectors and DC cable runs for burn marks or carbonisation. Ch…
Error 201
Leakage Current High
Test insulation resistance of each string independently (500 V DC IR test). Belo…
Error 202
PV Voltage Too High
Measure Voc of each string before sunrise (coldest condition). Compare to invert…
Error 203
PV Isolation Low (RISO)
Disconnect all strings. IR test each string at 500 V DC — any reading below 1 MΩ…
Error 300
AC Voltage Out of Range
Measure AC voltage at inverter terminals. Check ShinePhone for voltage history. …
Error 302
No AC Connection
Check AC isolator and consumer unit MCB. Confirm grid present with voltage teste…
Error 303
PE Abnormal / Earth Fault
Test earth continuity from inverter PE terminal to consumer unit earth bar. Must…
Error 304
AC Frequency Out of Range
Check frequency reading in ShinePhone. Log over time to determine if it is trans…
Error 402
DCI — DC Current Injection
Power cycle inverter. Allow full self-test
Error 404
Bus Sample Fault
Power cycle inverter. Check DC input voltage is within range before restarting
Error 405
Relay Fault
Power cycle inverter. Listen for relay click during startup sequence
Error 406
Model Mismatch
Check inverter model on label matches ShineServer registration. Check firmware v…
Error 407
Auto Test Failed
Check grid voltage and frequency are stable. Retry power cycle and allow inverte…
Error 408
Over-Temperature / NTC Fault
Check ambient temperature and ventilation clearances (min 200 mm clear above and…
Error 411
Internal Communication Fault
Power cycle inverter. Check firmware version matches expected version for the mo…
Error 418
Firmware Mismatch
Check DSP and ARM firmware versions in ShinePhone. Both should be the same relea…
Warning 506
Battery NTC Open Circuit
Check NTC sensor cable connector is fully seated at battery terminal block
ARK: Cell OV Alarm
Cell Over-Voltage Alarm
Allow a full charge cycle to maximum SOC — passive cell balancing only operates …
ARK: Cell UV Prot
Cell Under-Voltage Protection
Initiate charge immediately. Check minimum SOC setting in ShinePhone — increase …
ARK: Charge Hi Temp
High Temperature During Charge
Check ambient temperature at battery location. ARK operating range: 0–55°C disch…
ARK: Low Temp Chg Prot
Low Temperature Charge Inhibit
This is a normal protection — charging will resume when temperature rises above …
ARK: Int CAN Fail
Internal CAN Communication Failure
Check all Link0/Link1 cables between ARK modules — each cable must be fully seat…
ARK: Ext Comm Fail
External Communication Failure (Inverter Link)
Check INV port cable from BDC controller to inverter COM port is fully seated at…
ARK: Precharge SC
Pre-Charge Short Circuit
STOP. Do not re-energise. Inspect all DC wiring from battery to inverter for sho…
ARK: Insul Prot
Insulation Resistance Protection
Disconnect battery from inverter. Use an insulation resistance tester (500V DC) …
ARK: EEPROM Fail
BMS EEPROM Fault
Power cycle the system. If fault clears, monitor for recurrence
ARK: Cell Volt Diff
Cell Voltage Difference Too Large
Allow a full charge/discharge cycle to 100% SOC — passive balancing only operate…
THOR-100
Emergency Stop Activated
Locate red E-stop button on the side/front of the THOR charger. If pressed, twis…
THOR-105
Over-Voltage on Phase L1
Measure supply voltage at the charger input terminal. UK standard is 230V ±10% (…
THOR-110
DC Leakage Current / Internal RCD Trip
Disconnect the EV. Check if fault clears with EV removed. If it does, the leakag…
THOR-111
RS485 Meter Communication Fault
Open THOR side window. Check RS485 A and B terminals are wired correctly — A to …
THOR-115
PE (Earth) Fault
Check PE (yellow/green) conductor is connected at THOR terminal block. Measure e…
THOR-116
PEN Fault Detected
Do not reset and continue operation. A PEN fault on a PME network is a serious s…
ShineWiFi: Solid Green
ShineWiFi-X Not Connecting to Router
Check router: ensure 2.4GHz band is enabled (not disabled in favour of 5GHz-only…
ShineWiFi: Flashing Green
Router Connected But No Internet
Confirm internet on another device on the same network. If no internet on other …
ShineLink: Device Off
ShineRFStick-X Not Paired with ShineLanBox
Re-pair using the 4-step procedure: (1) Reset ShineLanBox (hold button until all…
Error 204
PV Input Mode Configuration Error
Open ShinePhone and check PV input mode setting. SPH models support two independ…
Error 205
PV String Balance / Ground Fault
Perform per-string IR test at 500V DC. The string with lower resistance is the l…
Error 301
AC Overcurrent -- Output Short Circuit
Open AC isolator and consumer unit MCB. Inspect AC wiring for visible damage. Co…
Error 305
Grid Overvoltage -- Persistent High Supply
Log grid voltage over 24 hours using ShinePhone or a power quality logger. Note …
Error 306
Grid Frequency Out of Range
Check if any generator or UPS is running on site. Grid frequency events are typi…
Error 307
Anti-islanding Protection Triggered
Check mains supply at the consumer unit. Confirm grid is present and MCB has not…
Error 400
Internal Hardware Fault
Perform a full power cycle: DC off, AC off, wait 3 minutes, AC on, DC on. Allow …
Error 401
EEPROM / Flash Memory Fault
Power cycle the inverter fully. If it restores settings and operates normally, t…
Error 403
Temperature Sensor Fault
Check ambient temperature at inverter location. A sensor reading extreme tempera…
Error 409
DSP Communication Fault
Power cycle fully. DSP communication faults that clear on restart may be one-off…
Error 412
Cooling Fan Failure
Listen for fan noise during high load. SPH fans are audible -- silence during pe…
Error 413
AC Overcurrent -- Hardware Protection
Isolate AC immediately. Inspect wiring for visible damage or burning. Do not res…
Error 414
DC Bus Overvoltage
Check PV string open-circuit voltage at inverter DC terminals -- particularly on…
Error 415
DC Bus Undervoltage
Check PV string voltage at inverter DC terminals. Below MPPT minimum (100V for S…
Error 416
DC Bus Imbalance / Asymmetry
Power cycle the inverter. Single occurrences may be transient
Error 417
AC Inductor Overcurrent
Isolate AC immediately. Inspect AC wiring and downstream loads. Do not restart w…
Warning 500
BMS Communication Fault
Check CAN cable between ARK battery BMS port and inverter BMS port. Confirm full…
Warning 501
Battery SOC Low Warning
Check ShinePhone for grid availability. If grid is present and battery is not ch…
Warning 502
Battery High Temperature Warning
Check the battery installation location temperature. ARK batteries must not exce…
Warning 503
Battery High Voltage Warning
Check ShinePhone battery voltage reading. Confirm it is within ARK specification…
Warning 504
Battery Overcurrent Warning -- Charge
Check ShinePhone battery charge power setting. Ensure charge rate does not excee…
Warning 505
Battery Polarity Reversed
ISOLATE DC IMMEDIATELY. Do not attempt to restart. If the inverter was energised…
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