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Solis (Ginlong) Error Codes

Expert reference guide covering all Solis (Ginlong) inverter diagnostic codes with comprehensive troubleshooting procedures and professional repair guidance

Quickly identify problems with your Solis solar system and learn the correct response procedures

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Solis (Ginlong) Inverter Models

Solis, manufactured by Ginlong Technologies, produces a comprehensive range of solar inverters for residential, commercial, and utility-scale applications. Solis inverters are known for their reliability, efficiency, and advanced monitoring capabilities. The product line includes single-phase and three-phase inverters with various power ratings to suit different installation requirements. These diagnostic codes are applicable to the majority of Solis (Ginlong) inverter systems. Error indicators typically manifest as error codes displayed on the inverter LCD screen, LED status lights, or in the Solis monitoring portal.

How to Read Error Codes

• Check inverter LCD screen for error code display
• Review LED status indicators on inverter
• Check Solis monitoring portal for system status messages
• Note error code format (e.g., OV-TEM, PV ISO-PRO, NO-GRID)
• Consult Solis documentation for your specific model

Solis Product Series

• Single-Phase Inverters - Residential applications
• Three-Phase Inverters - Commercial and utility applications
• Hybrid Inverters - Integrated energy storage solutions
• Monitoring Systems - Advanced system monitoring and communication
• Smart Energy Management - Intelligent energy optimization

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Understanding Diagnostic Codes

Solis (Ginlong) inverter systems incorporate sophisticated diagnostic capabilities that automatically detect operational issues. When a problem is identified, the system communicates through error codes displayed on the inverter LCD screen, LED status indicators, and status messages in the Solis monitoring portal. This intelligent diagnostic framework enables rapid problem identification and helps determine the appropriate response. All Solis inverter series utilize continuous performance monitoring with real-time error detection. Error codes may be displayed in different formats depending on firmware version and model. Always reference your specific model's installation manual for precise code definitions and consult with a certified Solis installer for professional diagnosis and repair.

Temperature and Overheating Errors

Problems with inverter temperature and thermal protection.

Code	Meaning	Possible Causes	Solutions
OV-TEM	Overtemperature - Inverter temperature exceeds maximum limit	•Insufficient ventilation around inverter •Direct sunlight exposure on inverter •High ambient temperature •Blocked air vents •Faulty cooling system •Inverter installed in enclosed space	Improve ventilation around the inverter Ensure inverter is not exposed to direct sunlight Check that air vents are not blocked Verify adequate clearance around inverter (minimum 30cm on all sides) Check cooling fan operation if applicable Allow inverter to cool down before restart Relocate inverter if necessary to improve ventilation Contact installer if temperature remains high after improving ventilation

Initialization and System Errors

Problems with inverter initialization and internal systems.

Code	Meaning	Possible Causes	Solutions
INI-FAULT	Initialization Fault - Error in initialization system	•System startup failure •Internal control board issue •Software initialization error •Hardware component failure •Power supply issue during startup	Restart the inverter by turning OFF/ON switch Wait 30 seconds before restarting Check DC and AC connections Verify grid connection is stable If error persists, contact certified installer May require firmware update or professional service
DSP-B-FAULT	DSP Communication Fault - Communication error between main and auxiliary DSP	•Internal communication failure •DSP board issue •Control board problem •Internal wiring issue •Component malfunction	Restart the inverter by turning OFF/ON switch Wait for system to fully initialize If error persists, contact certified installer This may require professional diagnosis May need inverter service or component replacement
12Power-FAULT	12V Power Supply Fault - Error in 12V power supply	•12V power supply failure •Internal power supply issue •Control board power problem •Component failure	Restart the inverter by turning OFF/ON switch Check inverter power connections If error persists, contact certified installer This requires professional diagnosis May need power supply replacement

Isolation and Ground Fault Protection

Critical safety errors related to electrical isolation and ground fault detection.

Code	Meaning	Possible Causes	Solutions
PV ISO-PRO 01/02	PV Isolation Protection - PV isolation fault detected	•Damaged PV module insulation •Water ingress in junction boxes •Damaged DC wiring insulation •Ground fault in PV array •Faulty inverter isolation monitoring •Moisture in connections	Immediately shut down the system Disconnect all DC inputs, reconnect them, and restart the inverter Do not attempt to restart until fault is resolved Inspect all PV module connections and junction boxes Check DC wiring for damage or water ingress Test isolation resistance with megohmmeter Check for moisture in junction boxes Contact certified installer immediately This is a serious safety condition requiring professional diagnosis
ILeak-PRO 01/02/03/04	Leakage Current Protection - Leakage current protection activated	•AC or DC connection issues •Internal cable connection problems in inverter •Ground fault •Insulation degradation •Moisture in system	Check AC and DC connections Inspect internal cable connections of the inverter Verify all connections are secure and dry Test for ground faults Check insulation resistance If error persists, contact certified installer Professional diagnosis required

Arc Fault and Safety Errors

Critical safety errors related to arc detection and fire hazards.

Code	Meaning	Possible Causes	Solutions
AFCI-Selbsterkennung	AFCI Self-Detection Error - Self-detection error of AFCI module	•AFCI module fault •Internal AFCI circuit issue •AFCI module communication error •Component failure	Restart the inverter by turning OFF/ON switch If error persists, contact certified technician This requires professional diagnosis AFCI module may need replacement
Lichtbogenschutz	Arc Fault Protection - Arc detected in DC circuit	•Loose DC connections •Damaged DC wiring •Corroded connections •Faulty connectors •Arc in PV array	Immediately shut down the system Do not attempt to restart Check DC connections for arcs Inspect all DC connections for looseness Check DC wiring for damage Contact certified installer immediately This is a critical safety condition Professional inspection required before restart

DC Voltage and Power Errors

Problems with DC input voltage and power.

Code	Meaning	Possible Causes	Solutions
OV-DC01/02/03/04	DC Overvoltage - DC input voltage exceeds maximum limit	•Too many modules per string •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch •Open circuit voltage too high	Check string voltage with multimeter Verify number of modules per string matches inverter specifications Review string configuration in installation manual Account for cold weather voltage rise in calculations Reduce number of modules in series if necessary Verify module specifications match system design Contact certified installer to verify string configuration
OV-BUS	DC Bus Overvoltage - DC bus voltage exceeds maximum limit	•DC bus voltage too high •Inverter inductance connection issue •Driver connection problem •Internal component failure	Check connections of inverter inductance Check driver connections Restart the inverter If error persists, contact certified installer May require professional diagnosis
UN-BUS01/02	DC Bus Undervoltage - DC bus voltage below minimum limit	•DC bus voltage too low •Insufficient DC input •Internal power supply issue •Component failure	Check DC bus voltage Verify DC input connections Check string voltage If error persists, contact certified installer May require professional diagnosis
Reve-DC	Reverse DC Polarity - One of the DC strings is reverse connected	•Incorrect DC string polarity •Positive and negative wires swapped •Installation error	Check polarity of PV strings Verify positive and negative connections Correct polarity during low sunlight conditions Do not attempt to correct during high sunlight Contact installer if unsure about connections
DCinj-FAULT	DC Injection Fault - High DC injection current detected	•DC component in AC output •Internal inverter fault •Control circuit issue •Component failure	Restart the inverter If error persists, contact certified installer This requires professional diagnosis May need inverter service or repair
DC-INTF OV-DCA-I	DC Input Overcurrent - Overcurrent at DC input	•Faulty PV string •Short circuit in DC circuit •Overcurrent condition •String configuration error	Restart the inverter Identify and remove the faulty PV string Check DC connections for shorts Verify string configuration If error persists, contact certified installer Professional diagnosis may be required

AC Grid Voltage and Frequency Errors

Problems with AC grid voltage, frequency, and grid connection.

Code	Meaning	Possible Causes	Solutions
OV-G-V01/02/03/04	Grid Overvoltage - Grid voltage exceeds maximum limit	•Utility grid voltage too high •Grid voltage fluctuations •Transformer tap settings •Grid instability •Voltage regulation issue •AC cable resistance too high	Do not attempt to override safety shutdown Check utility grid voltage with multimeter Check AC cables for excessive resistance Adjust protection threshold if allowed by grid operator Contact utility company to report voltage issues Wait for grid voltage to return to normal range System will automatically reconnect when voltage stabilizes Contact certified installer if voltage issues persist
UN-G-V01/02	Grid Undervoltage - Grid voltage below minimum limit	•Utility grid voltage too low •Grid voltage fluctuations •Transformer issues •Grid instability •Voltage drop in distribution	Do not attempt to override safety shutdown Adjust protection threshold if allowed by grid operator Check utility grid voltage with multimeter Contact utility company to report voltage issues Wait for grid voltage to return to normal range System will automatically reconnect when voltage stabilizes Contact certified installer if voltage issues persist
OV-G-F01/02	Grid Overfrequency - Grid frequency exceeds maximum limit	•Grid frequency too high •Grid instability •Utility frequency regulation issue	Check grid frequency Wait for grid frequency to return to normal range If error persists, contact certified installer May require utility company intervention
UN-G-F01/02	Grid Underfrequency - Grid frequency below minimum limit	•Grid frequency too low •Grid instability •Utility frequency regulation issue	Check grid frequency Wait for grid frequency to return to normal range If error persists, contact certified installer May require utility company intervention
NO-GRID	No Grid Voltage - No grid voltage detected	•Grid connection lost •Grid switch off •AC breaker tripped •Grid outage •AC connection issue	Check grid connections and grid switch Check grid voltage at inverter terminals Verify AC breaker is not tripped Check for grid outage Wait for grid to return System will automatically reconnect when grid is available Contact installer if grid connection cannot be restored
G-IMP	High Grid Impedance - Grid impedance too high	•Poor grid connection •High grid impedance •AC connection issue •Grid instability	Check grid connections Verify AC connections are secure Check AC cable size and length If error persists, contact certified installer May require grid connection improvement
GRID-INTF01/02	Grid Interference - Grid disturbance detected	•Grid disturbance •Grid instability •Voltage fluctuations •Frequency variations	Restart the inverter Wait for grid to stabilize If error persists, contact certified installer May require utility company investigation
OV-G-I	Grid Overcurrent - Grid current exceeds maximum limit	•Grid current too high •Grid connection issue •Inverter output problem	Check grid connections Verify AC connections are correct If error persists, contact certified installer May require professional diagnosis

Current Measurement and Control Errors

Problems with current measurement and control systems.

Code	Meaning	Possible Causes	Solutions
IGBT-OV-I	IGBT Overcurrent - IGBT current exceeds maximum limit	•IGBT overcurrent condition •Internal inverter fault •Component failure •Control circuit issue	Restart the inverter If error persists, contact certified installer This requires professional diagnosis May need inverter service or component replacement
IGFOL-F	Grid Current Tracking Failure - Grid current tracking failed	•Current tracking circuit failure •Control system issue •Component malfunction	Restart the inverter If error persists, contact certified installer This requires professional diagnosis May need inverter service
IG-AD	Grid Current Measurement Failure - Grid current measurement failed	•Current sensor failure •Measurement circuit issue •Component malfunction	Restart the inverter If error persists, contact certified installer This requires professional diagnosis May need sensor or component replacement

Relay and Control Errors

Problems with relay control and system checks.

Code	Meaning	Possible Causes	Solutions
RelayChk-FAIL	Relay Check Failed - Relay control check failed	•Relay failure •Relay control circuit issue •Component malfunction •Internal fault	Restart the inverter If error persists, contact certified installer This requires professional diagnosis May need relay replacement or repair

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Critical Safety Notice

Do not attempt DIY repairs on your Solis solar system. The majority of diagnostic codes relate to high-voltage DC and AC electrical systems, grid connection safety mechanisms, or critical safety features. Specific codes requiring immediate professional intervention include: PV ISO-PRO (Isolation Protection), ILeak-PRO (Leakage Protection), Lichtbogenschutz (Arc Fault), and AFCI-Selbsterkennung (AFCI Fault). Upon encountering these codes, immediately shut down the system if safe to do so and contact a certified Solis installer without delay.

Professional service is mandatory—contact a licensed solar installer or reach out to Solis technical support for expert assistance.

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Maintenance Guidelines

Scheduled Service Requirements

✓Professional inspection and service annually by certified Solis installer
✓Monthly visual inspection of solar panels for damage or soiling
✓Clean panels quarterly or as needed based on local conditions
✓Monitor system performance daily through Solis monitoring portal
✓Check inverter status and LED indicators monthly
✓Verify all system components are reporting correctly

Proactive Maintenance Strategies

✓Keep panels clean to maximize energy production
✓Trim trees and vegetation to prevent shading
✓Inspect DC wiring and connections for damage or corrosion
✓Monitor production trends for early problem detection
✓Ensure adequate ventilation around inverter
✓Review system alerts and error codes promptly

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Frequently Asked Questions

What does error code PV ISO-PRO mean?

PV ISO-PRO indicates a PV isolation protection fault. This is a serious safety condition where the isolation between the PV system and ground has failed. Immediately shut down the system and do not attempt to restart until the fault is resolved. Disconnect all DC inputs, inspect all PV module connections and junction boxes, check DC wiring for damage or water ingress, and test isolation resistance. Contact a certified Solis installer immediately for professional diagnosis.

What should I do if I see error code OV-TEM?

OV-TEM indicates the inverter temperature is too high. Improve ventilation around the inverter, ensure it is not exposed to direct sunlight, check that air vents are not blocked, and verify adequate clearance around the inverter. Allow the inverter to cool down before restart. If the temperature remains high after improving ventilation, contact your installer.

What does error code NO-GRID mean?

NO-GRID means no grid voltage is detected. Check grid connections and the grid switch, verify the AC breaker is not tripped, check for grid outages, and verify grid voltage at the inverter terminals. The system will automatically reconnect when the grid is available. Contact your installer if the grid connection cannot be restored.

How do I check error codes on my Solis inverter?

Error codes can be viewed on the inverter LCD screen, through LED status indicators on the inverter, or in the Solis monitoring portal. Check the LCD display for error messages, observe the LED status lights, and log into your Solis monitoring account to view system status and error history.

What should I do if I see error code Lichtbogenschutz?

Lichtbogenschutz (Arc Fault Protection) indicates an arc has been detected in the DC circuit. This is a critical safety condition. Immediately shut down the system and do not attempt to restart. Check DC connections for arcs, inspect all DC connections for looseness, and check DC wiring for damage. Contact a certified installer immediately for professional inspection before restart.

Can I reset error codes by restarting the inverter?

Some error codes may be resolved by restarting the inverter (turning OFF/ON switch), but many codes indicate serious conditions that require professional diagnosis. Safety-related codes (isolation faults, arc faults) should never be reset without professional inspection. Always follow the recommended solutions for each specific error code and contact a certified installer if the error persists.