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Deye Error Codes

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

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

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Deye Inverter Models

Deye is a Chinese company specializing in the development and manufacturing of inverters for photovoltaic systems. Deye inverters are known for their efficiency, reliability, and advanced technology. The product line includes the SUN series (single-phase and three-phase inverters) and hybrid inverters with integrated battery storage. These diagnostic codes are applicable to the majority of Deye inverter systems. Error indicators typically manifest as error codes displayed on the inverter LCD screen, LED status lights, or in the monitoring portal. Error codes follow the format "F" followed by a two-digit number (e.g., F12, F13, F20).

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., F12, F13, F20)
• Consult Deye documentation for your specific model
• Error codes typically start with "F" followed by numbers

Deye Product Series

• SUN Series - Single-phase and three-phase inverters
• Hybrid Inverters - Integrated battery storage solutions
• Grid-Tie Inverters - Standard grid-connected systems
• Energy Storage Systems - Complete battery solutions
• Monitoring Systems - Advanced system monitoring and control

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Understanding Diagnostic Codes

Deye 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. Error codes typically follow the format "F" followed by a two-digit number (e.g., F12, F13, F20). This intelligent diagnostic framework enables rapid problem identification and helps determine the appropriate response. All Deye inverter series utilize continuous performance monitoring with real-time error detection. Error codes may vary slightly depending on firmware version and model. Always reference your specific model's installation manual for precise code definitions and consult with a certified Deye installer for professional diagnosis and repair.

DC Input and Polarity Errors

Problems with DC input connections and polarity.

Code	Meaning	Possible Causes	Solutions
F12	DC Input Reverse Polarity - PV input polarity reversed	•Incorrect PV input polarity •Positive and negative wires swapped •Installation error •DC connection mistake	Check PV input polarity Verify positive and negative connections are correct Check wiring of solar modules Ensure connections are properly made Correct polarity if necessary Contact installer if unsure about connections

Isolation and Ground Fault Errors

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

Code	Meaning	Possible Causes	Solutions
F13	DC Isolation Impedance Fault - Persistent DC isolation impedance error	•Inverter grounding problem •Ground fault in PV system •Isolation impedance below threshold •Grounding cable issue •DC isolation failure	Check inverter grounding cable Verify proper grounding connection Test isolation impedance Check for ground faults in PV system Inspect DC wiring for damage Contact installer if error persists Professional diagnosis may be required
F14	DC Leakage Current Fault - Unusual leakage current in DC circuit	•DC leakage current detected •Insulation degradation •Moisture in system •Ground fault	This code appears rarely Check DC circuit for leakage Inspect insulation condition Check for moisture ingress If error persists, contact installer Professional diagnosis required
F15	GFDI Ground Fault - Faulty connection of solar module to ground	•GFDI ground fault •Faulty solar module grounding •Ground connection issue •GFDI circuit fault	Check solar module connection Verify proper grounding Inspect GFDI circuit Check ground connections Contact installer if error persists
F18	GFDI Fuse Blown - Defective GFDI fuse	•GFDI fuse failure •Overcurrent condition •Fuse defect	This code appears rarely Check GFDI fuse condition Replace fuse if necessary Contact installer for fuse replacement Professional service required
F19	GFDI Ground Contact Fault - Faulty ground connection	•GFDI ground contact fault •Ground connection problem •GFDI circuit issue	This code appears rarely Check ground connections Verify GFDI circuit Contact installer if error persists Professional diagnosis required
F20	Isolation Fault - Ground fault in PV modules	•Ground fault in PV modules •Isolation failure •Module insulation problem •DC ground fault	Measure isolation of modules Disconnect DC switch if necessary Check PV module insulation Inspect DC wiring for ground faults Test isolation resistance Contact installer for professional diagnosis This is a serious safety condition

Memory and Storage Errors

Problems with internal memory and EEPROM storage.

Code	Meaning	Possible Causes	Solutions
F16	Memory Read Error - Problem accessing internal memory (EEPROM)	•EEPROM read failure •Memory corruption •Internal memory error •Storage access problem	Restart the inverter If error persists, contact installer or Deye service May require firmware update Professional service may be needed
F17	Memory Write Error - Problem writing to internal memory (EEPROM)	•EEPROM write failure •Memory corruption •Internal memory error •Storage write problem	Restart the inverter If error persists, contact installer or Deye service May require firmware update Professional service may be needed

Power Supply and Relay Errors

Problems with power supply and relay control.

Code	Meaning	Possible Causes	Solutions
F21	Auxiliary Power Supply Failure - Missing DC 23V supply	•DC 23V power supply failure •Auxiliary power circuit issue •Internal power supply problem	Restart the inverter Check power supply connections If error persists, contact installer or Deye service May require component replacement
F22	AC Main Contactor Fault - Problem with AC main contactor	•AC main contactor failure •Contactor control issue •Component malfunction	This code appears rarely Check AC main contactor If error persists, contact installer Professional service required
F23	AC Auxiliary Contactor Fault - Problem with AC auxiliary contactor	•AC auxiliary contactor failure •Contactor control issue •Component malfunction	This code appears rarely Check AC auxiliary contactor If error persists, contact installer Professional service required

Overcurrent and Current Measurement Errors

Problems with overcurrent protection and current measurement.

Code	Meaning	Possible Causes	Solutions
F24	Phase Loss or AC Voltage Detection Failure - Loss of one phase or failure of part of AC voltage detection	•Phase loss •AC voltage detection failure •Three-phase imbalance •AC connection issue	Restart the inverter Check AC connections Verify all three phases are connected Check AC voltage on all phases If error persists, contact installer or Deye service
F25	DC Firmware Overcurrent - Overcurrent in DC circuit	•DC overcurrent condition •DC circuit overload •Firmware detected overcurrent	This code appears rarely Check DC circuit for overload Verify DC current ratings If error persists, contact installer Professional diagnosis required
F26	AC Firmware Overcurrent - Overcurrent in AC circuit	•AC overcurrent condition •AC circuit overload •Firmware detected overcurrent	Restart the inverter Check AC circuit for overload Verify AC current ratings If error persists, contact installer or Deye service Professional diagnosis may be required
F28	Three-Phase Current Overcurrent - Overcurrent in one of the phases	•Phase overcurrent •Three-phase imbalance •AC load issue	This code appears rarely Check three-phase current balance Verify AC load distribution If error persists, contact installer
F29	Three-Phase Current Overcurrent - Overcurrent in one of the phases	•Phase overcurrent •Three-phase imbalance •AC load issue	Restart the inverter Check three-phase current balance Verify AC load distribution If error persists, contact installer or Deye service

Leakage Current and GFCI Errors

Problems with leakage current detection and GFCI protection.

Code	Meaning	Possible Causes	Solutions
F27	GFCI (RCD) AC Leakage Current Fault - Average leakage current over 411mA	•AC leakage current too high •GFCI/RCD fault •Ground fault in AC circuit •Leakage current exceeds threshold	Check DC power supply and solar modules Restart the inverter Check for ground faults in AC circuit Test leakage current If error persists, contact installer or Deye service Professional diagnosis required

Hardware and Component Errors

Problems with internal hardware and component failures.

Code	Meaning	Possible Causes	Solutions
F20 (IGBT)	IGBT Damaged by Excessive Voltage Drop - IGBT damaged by excessive voltage drop	•IGBT component failure •Excessive voltage drop •Component damage •Internal hardware fault	This code appears rarely Contact installer immediately This requires professional diagnosis Component replacement necessary Do not attempt DIY repair
F30	All Hardware Faults Synthesis - General hardware fault	•Multiple hardware faults •General hardware failure •Component malfunction •Internal system error	This code appears rarely Contact installer immediately Export device log files for diagnosis This requires professional diagnosis Contact Deye support with log files

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Critical Safety Notice

Do not attempt DIY repairs on your Deye 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: F20 (Isolation Fault), F13 (DC Isolation Impedance Fault), F15 (GFDI Ground Fault), and F27 (GFCI Leakage Current Fault). Upon encountering these codes, immediately shut down the system if safe to do so and contact a certified Deye installer without delay. For error code F30 (Hardware Faults), export device log files before contacting support.

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

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Maintenance Guidelines

Scheduled Service Requirements

✓Professional inspection and service annually by certified Deye 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 LCD screen monthly
✓For hybrid systems, monitor battery status and health

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
✓Regularly check grounding connections

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Frequently Asked Questions

What does error code F12 (DC Input Reverse Polarity) mean?

F12 indicates that the PV input polarity is reversed. Check the PV input polarity, verify that positive and negative connections are correct, and check the wiring of solar modules. Ensure connections are properly made and correct polarity if necessary. Contact your installer if unsure about connections.

What should I do if I see error code F20 (Isolation Fault)?

F20 indicates a ground fault in PV modules. This is a serious safety condition. Measure the isolation of modules, disconnect the DC switch if necessary, check PV module insulation, and inspect DC wiring for ground faults. Test isolation resistance and contact your installer for professional diagnosis immediately.

What does error code F13 (DC Isolation Impedance Fault) mean?

F13 indicates a persistent DC isolation impedance error. Check the inverter grounding cable, verify proper grounding connection, test isolation impedance, and check for ground faults in the PV system. Inspect DC wiring for damage. Contact your installer if the error persists. Professional diagnosis may be required.

What should I do if I see error code F30 (All Hardware Faults)?

F30 indicates a general hardware fault. This code appears rarely. Contact your installer immediately, export device log files for diagnosis, and contact Deye support with the log files. This requires professional diagnosis and should not be attempted as a DIY repair.

How do I check error codes on my Deye inverter?

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

What does error code F27 (GFCI Leakage Current Fault) mean?

F27 indicates that the average AC leakage current exceeds 411mA. Check the DC power supply and solar modules, restart the inverter, check for ground faults in the AC circuit, and test leakage current. If the error persists, contact your installer or Deye service. Professional diagnosis is required.

Can I reset error codes by restarting the inverter?

Some error codes (like F16, F17, F21, F24, F26, F29) may be resolved by restarting the inverter, but many codes indicate serious conditions that require professional diagnosis. Safety-related codes (isolation faults, ground 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.