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Tigo Energy Error Codes

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

Quickly identify problems with your Tigo Energy system and learn the correct response procedures

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Tigo Energy Products

Tigo Energy produces intelligent solar and energy management solutions, including Module-Level Power Electronics (MLPE), Power Optimizers, and Rapid Shutdown Devices (RSD). Tigo optimizers provide module-level monitoring and optimization, improving system performance and safety. These diagnostic codes are applicable to Tigo Energy inverters and optimizer systems sold worldwide. Error indicators typically manifest as error codes displayed on the inverter display, LED status indicators, and status messages in the monitoring portal. Error codes are categorized as warnings (200-series) and errors (300-series and 400-series).

How to Read Error Codes

• Check inverter display for error codes (e.g., 203, 301, 401)
• Review LED status indicators on inverter
• Check monitoring portal for system alerts
• Warning codes (200-series) indicate potential issues
• Error codes (300-series, 400-series) indicate faults
• Consult Tigo Energy documentation for your specific model

Tigo Energy Product Series

• Power Optimizers - Module-level optimization
• Rapid Shutdown Devices (RSD) - Safety shutdown
• Monitoring Systems - System monitoring
• Inverters - Power conversion
• Tigo Cloud - Cloud-based monitoring

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Understanding Diagnostic Codes

Tigo Energy 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 display, 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 Tigo Energy systems utilize continuous performance monitoring with real-time error detection. Error codes are categorized as: Warning codes (200-series) that indicate potential issues requiring attention, Inverter error codes (300-series) for AC/DC and safety issues, and System error codes (400-series) for communication, firmware, and hardware issues. Always reference your specific system's documentation for precise code definitions.

Inverter Warning Codes

Warning codes that indicate potential issues requiring attention.

Code	Meaning	Possible Causes	Solutions
203	PV1 or PV2 Short Circuit - Short circuit in PV1 or PV2 circuit	•Short circuit in PV wiring •Reversed polarity •Faulty module •Wiring error •Module failure	Check polarity of PV modules Restart inverter If warning persists, contact Tigo support Inspect PV wiring for short circuits Check for reversed polarity connections Verify module connections
204	Disconnect Function Abnormality - Faulty disconnect function	•Disconnect switch failure •Wiring error •Disconnect device malfunction •Control circuit error	Turn off system Check wiring of disconnect switch Restart inverter If warning persists, contact Tigo support Verify disconnect switch operation Check disconnect device connections
205	PV1 or PV2 Boost Error - Error in boost section of PV1 or PV2	•Boost circuit failure •Internal inverter fault •PV input issue •Control circuit error	Restart inverter If warning persists, contact Tigo support Check PV input connections Verify PV module operation Contact installer for diagnosis
207	USB Overcurrent - Overcurrent at USB port	•USB device drawing too much current •USB port overload •Faulty USB device •USB port failure	Remove USB device or monitor Restart inverter Reconnect USB device or monitor after shutdown Use USB device within current limits Check USB device specifications

AC Grid Connection Errors

Problems with AC grid voltage, frequency, and connection.

Code	Meaning	Possible Causes	Solutions
301	AC Overcurrent - Overcurrent in AC output	•AC load too high •AC wiring fault •Grid connection issue •Overload condition	Check AC wiring Restart inverter If error persists, contact Tigo support Verify AC load is within limits Check for faulty AC connections
302	AC Overvoltage - Overvoltage in AC output	•Utility grid voltage too high •Grid voltage fluctuations •Transformer tap settings •Grid instability	Check AC wiring Check grid voltage and ensure it is within allowable limits Restart inverter If error persists, contact Tigo support Contact utility company if voltage is consistently out of range
303	AC Undervoltage - Undervoltage in AC output	•Utility grid voltage too low •Grid voltage fluctuations •Transformer issues •Grid instability	Check AC wiring Check grid voltage and ensure it is within allowable limits Restart inverter If error persists, contact Tigo support Contact utility company if voltage is consistently out of range
304	AC Overfrequency - Overfrequency in AC output	•Grid frequency too high •Grid instability •Frequency fluctuations	Check grid frequency Verify frequency is within allowable limits Restart inverter If error persists, contact Tigo support Contact utility company if frequency is consistently out of range
305	AC Underfrequency - Underfrequency in AC output	•Grid frequency too low •Grid instability •Frequency fluctuations	Check grid frequency Verify frequency is within allowable limits Restart inverter If error persists, contact Tigo support Contact utility company if frequency is consistently out of range
306	AC Error - General AC error	•AC wiring fault •Grid parameter issue •AC connection problem •Grid quality issue	Check AC wiring Check grid parameters Verify AC connections Restart inverter Contact installer if error persists
307	AC Overtemperature - AC section overtemperature	•Insufficient ventilation •High ambient temperature •Blocked air vents •Faulty cooling	Ensure inverter is properly ventilated Verify ambient temperature is within operating limits Check that air vents are not blocked Improve ventilation around inverter Contact installer if temperature remains high

DC Voltage and Power Errors

Problems with DC input voltage and power generation.

Code	Meaning	Possible Causes	Solutions
308	DC Overvoltage - DC input voltage exceeds maximum limit	•Too many modules in string •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration	Check DC input voltage Verify voltage is within allowable limits Review string configuration Account for cold weather voltage rise Contact installer to verify string configuration
309	DC Undervoltage - DC input voltage below minimum threshold	•Too few modules in string •Shading on panels •Faulty modules •DC wiring losses	Check DC input voltage Verify voltage is within allowable limits Inspect panels for shading Check for faulty modules Verify DC wiring connections Contact installer if voltage remains low
310	DC Error - General DC error	•DC wiring fault •PV module issue •DC connection problem •Module failure	Check DC wiring Check PV modules Verify DC connections Inspect modules for damage Contact installer if error persists
311	DC Overcurrent - DC input current exceeds maximum limit	•DC current too high •Module mismatch •Wiring fault •Optimizer issue	Check DC wiring Check PV modules Verify current is within limits Check optimizer operation Contact installer if error persists
312	DC Overtemperature - DC section overtemperature	•Insufficient ventilation •High ambient temperature •Blocked air vents •Faulty cooling	Ensure inverter is properly ventilated Verify ambient temperature is within operating limits Check that air vents are not blocked Improve ventilation around inverter Contact installer if temperature remains high

Ground Fault and Safety Errors

Problems with ground fault detection and electrical safety systems.

Code	Meaning	Possible Causes	Solutions
313	Isolation Fault - Isolation values of PV modules and wiring are out of range	•Damaged module insulation •Water ingress in junction boxes •Damaged DC wiring insulation •Ground fault in PV array	Check isolation values of PV modules and wiring Inspect all PV module connections and junction boxes Check DC wiring for damage or water ingress Test isolation resistance with megohmmeter Contact certified installer immediately This is a serious safety condition requiring professional diagnosis
314	Ground Fault - Ground fault detected in PV system	•Ground fault in PV array •Damaged module insulation •Water ingress in junction box •DC wiring insulation failure	Check PV modules and wiring for ground faults Inspect all DC connections and junction boxes Test ground fault detection system Check for water ingress in junction boxes Inspect DC wiring for damage or degradation Contact certified installer to perform ground fault testing This is a serious safety condition

System and Internal Errors

Problems with system communication, firmware, and internal components.

Code	Meaning	Possible Causes	Solutions
315	Internal Error - Internal inverter fault	•Internal inverter fault •Control board issue •Hardware failure •Component malfunction	Restart inverter If error persists, contact Tigo support Do not repeatedly restart if error continues Note error code and contact certified installer May require inverter replacement or repair
401	Communication Error - Error in communication between system components	•Communication wire break •Device not responding •Communication bus failure •Network connectivity problem •Firmware incompatibility	Check communication connections between system components Check communication wiring Restart system If error persists, contact Tigo support Verify network connectivity Check for loose or damaged communication cables
402	Firmware Error - Firmware issue detected	•Firmware corruption •Firmware update failure •Firmware incompatibility •Firmware version mismatch	Update inverter firmware Check for latest firmware version Follow firmware update procedure Contact Tigo support for firmware update assistance Do not interrupt firmware update process
403	Hardware Error - Hardware fault detected	•Hardware failure •Component malfunction •Internal hardware error •Device failure	Contact Tigo support for further assistance Do not attempt to repair yourself Note error details for service technician May require device replacement or repair
404	Memory Error - Memory fault detected	•Memory corruption •Storage device failure •Memory error •Data storage issue	Restart inverter If error persists, contact Tigo support May require device service or replacement Do not attempt to repair yourself
405	Temperature Error - Temperature sensor or system fault	•Temperature sensor failure •System temperature issue •Sensor wiring issue •Internal temperature error	Ensure inverter is properly ventilated Verify ambient temperature is within operating limits Check temperature sensor operation Contact installer if temperature error persists
406	Fan Error - Fan fault detected	•Fan failure •Fan blocked or obstructed •Fan wiring issue •Fan control circuit failure	Check inverter fan for proper operation Verify fan is not blocked or obstructed Check fan wiring connections Contact installer if fan continues to fail
407	Relay Error - Relay fault detected	•Relay failure •Relay stuck •Relay circuit failure •Relay control issue	Contact Tigo support for further assistance Do not attempt to repair yourself May require device service or replacement
408	Sensor Error - Sensor fault detected	•Sensor failure •Sensor wiring issue •Internal sensor failure •Sensor communication error	Check inverter sensors for proper operation Verify sensor connections Check sensor wiring Contact installer if sensor error persists
409	Grid Error - Grid parameter or connection issue	•Grid parameter issue •AC connection problem •Grid quality issue •Grid instability	Check grid parameters Check AC wiring Verify grid connection Contact installer if error persists
410	PV Error - PV module or connection issue	•PV module failure •DC connection problem •Module issue •DC wiring fault	Check PV modules Check DC wiring Verify module connections Inspect modules for damage Contact installer if error persists

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Critical Safety Notice

Do not attempt DIY repairs on your Tigo Energy 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: 313 (Isolation Fault), 314 (Ground Fault), 301 (AC Overcurrent), and 311 (DC Overcurrent). Upon encountering these codes, immediately shut down the system if safe to do so and contact a certified Tigo Energy installer or service without delay.

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

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Maintenance Guidelines

Scheduled Service Requirements

✓Professional inspection and service annually by certified Tigo Energy installer
✓Monthly visual inspection of solar panels and optimizers for damage or issues
✓Monitor system performance daily through monitoring portal
✓Check inverter status and LED indicators monthly
✓Verify optimizer communication monthly
✓Check inverter temperature and ventilation quarterly

Proactive Maintenance Strategies

✓Keep panels clean to maximize energy production
✓Trim trees and vegetation to prevent shading
✓Ensure adequate ventilation around inverter
✓Monitor optimizer performance for early problem detection
✓Keep firmware updated for latest features and fixes
✓Review system alerts and error codes promptly

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Frequently Asked Questions

What does error code 203 (PV1 or PV2 Short Circuit) mean?

Error code 203 indicates a short circuit in PV1 or PV2 circuit. Check polarity of PV modules, restart inverter, if warning persists contact Tigo support, inspect PV wiring for short circuits, check for reversed polarity connections, and verify module connections.

What does error code 313 (Isolation Fault) mean?

Error code 313 indicates that isolation values of PV modules and wiring are out of range. Check isolation values, inspect all PV module connections and junction boxes, check DC wiring for damage or water ingress, test isolation resistance, contact certified installer immediately, and this is a serious safety condition requiring professional diagnosis.

What does error code 314 (Ground Fault) mean?

Error code 314 indicates a ground fault detected in PV system. Check PV modules and wiring for ground faults, inspect all DC connections and junction boxes, test ground fault detection system, check for water ingress, inspect DC wiring for damage, contact certified installer to perform ground fault testing, and this is a serious safety condition.

What does error code 401 (Communication Error) mean?

Error code 401 indicates an error in communication between system components. Check communication connections between system components, check communication wiring, restart system, if error persists contact Tigo support, verify network connectivity, and check for loose or damaged communication cables.

Can I repair my Tigo Energy 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 portal, but all technical repairs require certified Tigo Energy installers. Unauthorized work on electrical systems poses extreme danger and violates building codes.

What should I do if I see error code 301 (AC Overcurrent)?

Error code 301 indicates overcurrent in AC output. Check AC wiring, restart inverter, if error persists contact Tigo support, verify AC load is within limits, and check for faulty AC connections.

What does error code 402 (Firmware Error) mean?

Error code 402 indicates a firmware issue detected. Update inverter firmware, check for latest firmware version, follow firmware update procedure, contact Tigo support for firmware update assistance, and do not interrupt firmware update process.

How often should I check my Tigo Energy system?

Monitor your system daily through the monitoring portal, check inverter status and LED indicators monthly, verify optimizer communication monthly, and perform professional inspection and service annually by a certified Tigo Energy installer. Review system alerts and error codes promptly.

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Summary

Proper interpretation of diagnostic codes is essential for effective Tigo Energy system troubleshooting. This comprehensive reference enables quick problem identification and guides appropriate response actions. Tigo Energy systems utilize error codes displayed on the inverter display, LED status indicators, and status messages in the monitoring portal to indicate specific sensor and system malfunctions. Tigo optimizers and inverter systems 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: 313 (Isolation Fault), 314 (Ground Fault), 301 (AC Overcurrent), and 311 (DC Overcurrent). These indicators represent serious safety hazards requiring certified Tigo Energy 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 model and firmware version—always consult your specific system's documentation for precise interpretations.