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SolarEdge Error Codes

Expert reference guide covering all SolarEdge inverter diagnostic codes with comprehensive troubleshooting procedures and professional repair guidance

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

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SolarEdge Inverter Models

SolarEdge produces an extensive lineup of premium inverter systems for residential and commercial solar installations. The HD-Wave series represents advanced inverter technology with high efficiency and reliability, while SE series models provide various power ratings for different installation sizes. Power Optimizers work in conjunction with SolarEdge inverters to maximize energy production from each solar panel. These diagnostic codes are applicable to the majority of SolarEdge inverter systems sold in the United States. Error indicators typically manifest as LED status lights on inverters and error codes displayed on the inverter LCD screen or in the monitoring portal.

How to Read Error Codes

• Check inverter LCD screen for error code display
• Review LED status indicators on inverter
• Check monitoring portal for system status messages
• Note error code format (e.g., 2×1, 18xB, 33xA)
• Consult SolarEdge documentation for your specific model

SolarEdge Product Series

• HD-Wave Series - Advanced high-efficiency inverters
• SE Series - Reliable inverter technology for standard installations
• Power Optimizers - Module-level power optimization
• Energy Bank - Integrated energy storage solutions
• Monitoring - System monitoring and communication

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Understanding Diagnostic Codes

SolarEdge 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 monitoring portal. This intelligent diagnostic framework enables rapid problem identification and helps determine the appropriate response. All SolarEdge inverter series (HD-Wave, SE series) utilize continuous performance monitoring with real-time error detection. Error codes may be displayed in different formats depending on firmware version—older firmware (3.18xx and earlier) uses three-digit codes, while newer firmware (3.19xx and later) may use different formats. Always reference your specific model's installation manual for precise code definitions.

Isolation and Ground Fault Errors

Problems with electrical isolation and ground fault detection.

Code	Meaning	Possible Causes	Solutions
2×1	Isolation Fault - Isolation error between PV system and ground	•Damaged PV module insulation •Water ingress in junction boxes •Damaged DC wiring insulation •Ground fault in PV array •Faulty inverter isolation monitoring	Immediately shut down the system 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 Contact certified SolarEdge installer immediately This is a serious safety condition requiring professional diagnosis
25xE	Isolation Test Failed - Isolation test before startup failed	•PV system isolation below threshold •Damaged module insulation •DC wiring insulation failure •Ground fault present •Moisture in connections	Do not attempt to start the system Inspect all PV modules for physical damage Check all DC connections and junction boxes Test isolation resistance (should be above minimum threshold) Check for water ingress in junction boxes Inspect DC wiring for damage or degradation Contact certified installer to perform isolation testing
169 (18xA9)	FI Sensor Error - Residual current sensor fault	•Faulty residual current sensor •Sensor wiring issue •Internal sensor failure •Communication error with sensor	Do not attempt to restart the system Contact SolarEdge support immediately This requires professional diagnosis Sensor replacement may be necessary

Arc Fault and Safety Errors

Critical safety errors related to arc detection and fire hazards.

Code	Meaning	Possible Causes	Solutions
3×2	Arc Fault Detected - Arc detected, potential fire hazard	•Loose DC connections •Damaged DC wiring •Corroded connections •Faulty connectors •Arc in PV array	Immediately shut down the system Do not attempt to restart Contact certified installer immediately This is a critical safety condition Inspect all DC connections for looseness Check DC wiring for damage Professional inspection required before restart
12 (18xC)	ARC_DETECTED - Arc fault detected in system	•Loose DC connections •Damaged DC wiring •Faulty connectors •Corroded terminals •Arc in PV string	Immediately shut down the system Refer to arc detection and interruption section in installation manual Do not attempt to restart until arc fault is resolved Inspect all DC connections Check DC wiring for damage Contact certified installer for arc fault investigation

AC Grid Voltage Errors

Problems with AC grid voltage and frequency.

Code	Meaning	Possible Causes	Solutions
18xB	AC Voltage Too High - Grid voltage exceeds maximum limit	•Utility grid voltage too high •Grid voltage fluctuations •Transformer tap settings •Grid instability •Voltage regulation issue	Do not attempt to override safety shutdown 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 May require utility company intervention
18×2	AC Voltage Too Low - 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 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 May require utility company intervention

DC Voltage and Power Errors

Problems with DC input voltage and power optimization.

Code	Meaning	Possible Causes	Solutions
171 (18xAB)	DC Input Overvoltage - DC input voltage of inverter is too high	•Too many modules per string •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch	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 Verify module specifications match system design Contact certified installer to verify string configuration
DC Voltage Too Low	DC input voltage below minimum operating threshold	•Too few modules per string •Shading on panels •Faulty modules •DC wiring losses •String configuration error	Check string voltage with multimeter Verify minimum number of modules per string Inspect panels for shading Check for faulty modules in string Verify DC wiring connections Review string configuration Contact certified installer if voltage remains low

Temperature and Overheating Errors

Problems with inverter temperature and thermal protection.

Code	Meaning	Possible Causes	Solutions
33xA	Temperature Too High - Inverter temperature exceeds maximum limit	•Insufficient ventilation •Direct sunlight on inverter •High ambient temperature •Blocked air vents •Faulty cooling fan	Improve ventilation around inverter Ensure inverter is not in direct sunlight Check that air vents are not blocked Verify adequate clearance around inverter Check cooling fan operation Allow inverter to cool down before restart Contact installer if temperature remains high after improving ventilation

Optimizer Communication Errors

Problems with Power Optimizer communication and operation.

Code	Meaning	Possible Causes	Solutions
41×8	No Communication with Optimizer - Communication lost with power optimizer	•Optimizer communication wire break •Faulty optimizer •Optimizer not powered •Communication bus issue •Optimizer failure	Check optimizer communication cable connections Verify optimizer is receiving DC power from panel Inspect communication wiring for damage Check optimizer LED status Identify which optimizer is not communicating Replace optimizer if communication cannot be restored Contact certified installer for optimizer replacement
Multiple Optimizers Not Reporting	Several optimizers not communicating with inverter	•Communication bus break •Multiple optimizer failures •Communication wire damage •Power loss to optimizers	Identify which optimizers are not reporting Check if non-reporting optimizers are on same communication bus Inspect communication wiring for breaks or damage Verify all optimizers are receiving DC power Check inverter communication bus connections Contact certified installer if multiple optimizers fail

Inverter Internal Errors

Problems with inverter internal systems and software.

Code	Meaning	Possible Causes	Solutions
81×1	Inverter Error - Internal inverter error	•Internal inverter fault •Control board issue •Software error •Hardware failure •Component malfunction	Attempt inverter restart by turning OFF/ON switch If error persists, contact SolarEdge support Do not repeatedly restart if error continues Note error code and contact certified installer May require inverter replacement or repair
45 (3x2)	Inv. Comm. Error - No connection to internal digital card of inverter	•Internal communication failure •Digital card issue •Control board problem •Internal wiring issue	Contact SolarEdge support for assistance This requires professional diagnosis May require inverter service or replacement
48 (3xF)	SW Error - Software error occurred	•Firmware bug •Software corruption •Memory error •Internal software issue	Contact SolarEdge support May require firmware update Professional service may be needed
166-168, 170 (18xA6-A8, 18xAA)	Hardware Error - Hardware fault detected	•Internal hardware failure •Component malfunction •Control board issue •Power stage failure	Contact SolarEdge support immediately This requires professional diagnosis Inverter may need repair or replacement

Configuration and Setup Errors

Problems with inverter configuration and country settings.

Code	Meaning	Possible Causes	Solutions
44 (3xB)	No Country Selected - No country selected for inverter operation	•Inverter not commissioned •Country setting missing •Configuration incomplete •Setup not completed	Select appropriate country according to installation manual instructions Complete inverter commissioning process Verify country setting matches installation location Contact installer if country selection fails
176 (3x6A)	For info contact your installer - Inverter has been externally locked	•Inverter locked by installer •Remote lock activated •Service mode enabled •Maintenance lock	Contact your installer for information Inverter may be locked for maintenance Do not attempt to unlock without installer authorization
193 (3x6A)	OFF/ON to Reconnect - Inverter requesting restart	•Normal restart request •System recovery •Automatic restart required	Turn ON/OFF switch to ON to start power generation This is a normal operation request System should resume operation after switch is turned on

Meter and Monitoring Errors

Problems with revenue grade meter and monitoring communication.

Code	Meaning	Possible Causes	Solutions
178 (3x6D)	Internal RGM Error - Internal error of Revenue Grade Meter	•RGM internal fault •Meter sensor issue •Internal communication error •Meter hardware failure	Check wiring of meter current sensors Verify connection to inverter communication card Inspect meter sensor connections Contact SolarEdge support if issue persists
185 (3x6E)	Meter Comm. Error - Communication error with meter	•Modbus communication failure •Meter wiring issue •Communication protocol error •Meter not responding	Read troubleshooting notes for Modbus meters in installation manual Check meter communication wiring Verify Modbus communication settings Test meter communication connection Contact installer for meter communication troubleshooting

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Critical Safety Notice

Do not attempt DIY repairs on your SolarEdge 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: 2×1 (Isolation Fault), 3×2 (Arc Fault Detected), and 12 (ARC_DETECTED). Upon encountering these codes, immediately shut down the system if safe to do so and contact a certified SolarEdge installer without delay.

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

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Maintenance Guidelines

Scheduled Service Requirements

✓Professional inspection and service annually by certified SolarEdge 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 monitoring portal
✓Check inverter status and LED indicators monthly
✓Verify all optimizers are reporting in monitoring system

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 2×1 (Isolation Fault) mean?

Error code 2×1 indicates an isolation fault between the PV system and ground. This is a serious safety condition. Immediately shut down the system and do not attempt to restart until the fault is resolved. Inspect all PV module connections and junction boxes, check DC wiring for damage or water ingress, and test isolation resistance. Contact a certified SolarEdge installer immediately for professional diagnosis.

What does error code 3×2 (Arc Fault Detected) mean?

Error code 3×2 indicates that an arc fault has been detected in the system, which is a potential fire hazard. Immediately shut down the system and do not attempt to restart. Contact a certified installer immediately. This is a critical safety condition. Inspect all DC connections for looseness and check DC wiring for damage. Professional inspection is required before restart.

What should I do if I see error code 18xB (AC Voltage Too High)?

Error code 18xB indicates that the grid voltage exceeds the maximum limit. Do not attempt to override the safety shutdown. Check utility grid voltage with a multimeter and contact the utility company to report voltage issues. Wait for grid voltage to return to normal range. The system will automatically reconnect when voltage stabilizes. Contact a certified installer if voltage issues persist.

How do I check if my Power Optimizers are working?

Check optimizer status in the monitoring portal. Each optimizer should show normal operation status. Verify optimizers are receiving DC power from solar panels and are communicating with the inverter. Review production data to ensure all optimizers are functioning. Check optimizer LED indicators if accessible. Contact a certified installer if optimizers are not reporting.

Can I repair my SolarEdge system myself?

High-voltage DC and AC electrical work must exclusively be performed by licensed professionals to ensure safety compliance. Homeowners can safely perform basic tasks like cleaning panels and monitoring the system portal, but all technical repairs require certified SolarEdge installers. Unauthorized work on electrical systems poses extreme danger and violates building codes.

What should I do if my inverter shows error code 33xA (Temperature Too High)?

Error code 33xA indicates the inverter temperature exceeds the maximum limit. Improve ventilation around the inverter, ensure it is not in direct sunlight, check that air vents are not blocked, verify adequate clearance around the inverter, and check cooling fan operation. Allow the inverter to cool down before restart. Contact an installer if temperature remains high after improving ventilation.

What does error code 41×8 (No Communication with Optimizer) mean?

Error code 41×8 indicates that communication has been lost with a power optimizer. Check optimizer communication cable connections, verify the optimizer is receiving DC power from the panel, inspect communication wiring for damage, check optimizer LED status, and identify which optimizer is not communicating. Replace the optimizer if communication cannot be restored. Contact a certified installer for optimizer replacement.

How often should I clean my solar panels?

Solar panels should be cleaned quarterly or as needed based on local conditions. Panels in dusty areas or areas with heavy pollen may need more frequent cleaning. Keep panels clean to maximize energy production. Inspect panels monthly for damage or excessive soiling that may require immediate cleaning.

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Summary

Proper interpretation of diagnostic codes is essential for effective SolarEdge solar system troubleshooting. This comprehensive reference enables quick problem identification and guides appropriate response actions. SolarEdge systems utilize error codes displayed on inverter LCD screens, LED status indicators, and status messages in the monitoring portal to indicate specific sensor and system malfunctions. HD-Wave and SE series inverters provide diagnostic information through error codes and monitoring systems for convenient diagnosis.

⚠️Complex diagnostic situations, especially those involving high-voltage DC and AC electrical systems and grid connection safety, require immediate professional evaluation. Critical codes demanding urgent response include: 2×1 (Isolation Fault), 3×2 (Arc Fault Detected), and 12 (ARC_DETECTED). These indicators represent serious safety hazards requiring certified SolarEdge installer response. Adherence to scheduled maintenance protocols and immediate attention to diagnostic codes extends equipment service life and minimizes long-term operational costs. Note that error code formats may vary by firmware version—always consult your specific unit's installation and service manual for precise interpretations.