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Delta Electronics Error Codes

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

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

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Delta Electronics Inverter Models

Delta Electronics produces an extensive lineup of premium inverter systems for residential and commercial solar installations. Delta solar inverters feature high efficiency, advanced monitoring capabilities, and robust diagnostic systems. These diagnostic codes are applicable to the majority of Delta Electronics inverter systems sold in the United States. Error indicators typically manifest as error codes on the inverter display, LED status indicators, and status messages in the monitoring portal.

How to Read Error Codes

• Check inverter display for error codes (e.g., E11, E12, E13, E14)
• Review LED status indicators on inverter
• Check monitoring portal for system status messages
• Note error code format and any additional information
• Consult Delta Electronics documentation for your specific model

Delta Electronics Product Features

• High-efficiency solar inverters
• Advanced monitoring and diagnostics
• Robust safety features
• Grid connection compliance
• Professional installation support

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Understanding Diagnostic Codes

Delta Electronics 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, 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 Delta Electronics inverter models utilize continuous performance monitoring with real-time error detection. Error codes are typically alphanumeric (e.g., E11, E12, E13, E14, AC Volt High, DC Current High) that indicate specific system conditions or faults. Always reference your specific model's installation manual for precise code definitions.

Grid Connection Errors

Problems with AC grid voltage, frequency, and connection.

Code	Meaning	Possible Causes	Solutions
AC Volt High	Grid voltage exceeds maximum limit - System shutdown for safety	•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
AC Volt Low	Grid voltage below minimum limit - System shutdown for safety	•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
AC Freq High	Grid frequency exceeds maximum limit - System shutdown	•Grid frequency too high •Grid instability •Frequency fluctuations •Grid synchronization issue	Check grid frequency (should be 50Hz or 60Hz depending on region) Verify frequency is within allowable limits Inverter will automatically attempt to reconnect when frequency returns to normal Wait for grid frequency to stabilize Contact utility company if frequency is consistently out of range Contact installer if problem persists
AC Freq Low	Grid frequency below minimum limit - System shutdown	•Grid frequency too low •Grid instability •Frequency fluctuations •Grid synchronization issue	Check grid frequency (should be 50Hz or 60Hz depending on region) Verify frequency is within allowable limits Inverter will automatically attempt to reconnect when frequency returns to normal Wait for grid frequency to stabilize Contact utility company if frequency is consistently out of range Contact installer if problem persists
Grid Quality	Grid quality issue detected - System shutdown for safety	•Grid voltage instability •Grid frequency instability •Grid harmonics •Grid quality degradation •Grid regulation issue	Check grid voltage and frequency stability Verify grid quality parameters Wait for grid quality to improve Contact utility company to report grid quality issues System will automatically reconnect when grid quality improves Contact installer if problem persists
No Grid	System has lost connection to utility grid	•Grid power outage •Main breaker tripped •Utility disconnect •Grid failure •Anti-islanding protection	Verify grid power is actually lost Check main breaker for system This is normal safety behavior during grid outage Wait for grid power to be restored System will automatically reconnect when grid is restored If grid is normal, contact installer to check grid connection
3Phase Unbalance	Three-phase voltage unbalance detected - Internal error	•Internal inverter fault •Phase imbalance in grid •Grid connection issue •Internal measurement error	Check grid voltage balance between phases Verify grid connection is correct Contact Delta inverter service for internal fault diagnosis Do not attempt to repair yourself May require inverter service or replacement
Phase Jump	Phase jump detected - Internal error	•Internal inverter fault •Grid phase issue •Internal measurement error •Control board issue	Contact Delta inverter service immediately This is an internal error requiring professional diagnosis Do not attempt to repair yourself May require inverter service or replacement

DC Voltage and Power Errors

Problems with DC input voltage and power generation.

Code	Meaning	Possible Causes	Solutions
Solar1High	DC input voltage from string 1 exceeds maximum limit	•Too many modules in string 1 •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch	Check string 1 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
Solar2High	DC input voltage from string 2 exceeds maximum limit	•Too many modules in string 2 •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch	Check string 2 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 Current High	DC input current exceeds maximum limit - Internal error	•Internal inverter fault •DC current measurement error •Control board issue •Hardware malfunction	Contact Delta inverter service immediately This is an internal error requiring professional diagnosis Do not attempt to repair yourself May require inverter service or replacement
DC Undervoltage	DC input voltage below minimum operating threshold	•Too few modules in 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

Ground Fault and Safety Errors

Problems with ground fault detection and electrical safety systems.

Code	Meaning	Possible Causes	Solutions
Ground Current	Ground current detected - System check required	•Ground fault in PV array •Damaged module insulation •Water ingress in junction box •DC wiring insulation failure •Ground fault in module	Do not attempt to start the system Inspect all PV modules for physical damage Check all DC connections and junction boxes Test ground current and isolation resistance 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
Isolation Fault	Isolation error detected 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 Delta installer immediately This is a serious safety condition requiring professional diagnosis

Hardware and Internal Errors

Problems with inverter internal systems and hardware components.

Code	Meaning	Possible Causes	Solutions
HW DSP ADC1	Hardware DSP ADC1 error - Internal error	•Internal inverter fault •DSP board issue •ADC circuit failure •Control board malfunction	Contact Delta inverter service immediately This is an internal error requiring professional diagnosis Do not attempt to repair yourself May require inverter service or replacement
HW FAN	Hardware fan error - Cooling system check required	•Fan failure •Fan blocked or obstructed •Fan wiring issue •Fan control circuit failure •Insufficient ventilation	Check fan operation and ventilation Verify fan is not blocked or obstructed Check fan wiring connections Ensure adequate ventilation around inverter Review installation manual and check PV system Contact installer if fan continues to fail
E11	Charger Error - Charger is damaged	•Charger circuit failure •Charger component failure •Internal charger fault •Charger control issue	Contact Delta service personnel Do not attempt to repair yourself Charger may need to be replaced This requires professional diagnosis
E12	Fan Error - Fan is damaged or blocked	•Fan failure •Fan blocked or obstructed •Fan wiring issue •Fan control circuit failure	Check if fan ventilation is normal Check if fan is running normally Clean filters if installed Reduce load if possible Contact Delta service personnel if fan continues to fail
E13	Overtemperature - Inverter temperature is too high	•Insufficient ventilation •Direct sunlight on inverter •High ambient temperature •Blocked air vents •Faulty cooling fan	Check if inverter ventilation is normal Reduce load if possible Check if fan is running normally Clean filters if installed Improve ventilation around inverter Ensure inverter is not in direct sunlight Allow inverter to cool down before restart Contact installer if temperature remains high after improving ventilation
E14	+/- DC BUS High/Low - DC bus irregularity detected	•DC bus voltage irregularity •Internal inverter fault •DC bus circuit failure •Control board issue	Contact Delta service personnel This is an internal error requiring professional diagnosis Do not attempt to repair yourself May require inverter service or replacement
Internal Inverter Error	Internal inverter fault or hardware error	•Internal inverter fault •Control board issue •Hardware failure •Component malfunction	Attempt inverter restart If error persists, contact Delta inverter service Do not repeatedly restart if error continues Note error code and contact certified installer May require inverter replacement or repair

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Critical Safety Notice

Do not attempt DIY repairs on your Delta Electronics 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: Ground Current, Isolation Fault, HW DSP ADC1, and E14 (+/- DC BUS High/Low). Upon encountering these codes, immediately shut down the system if safe to do so and contact a certified Delta Electronics installer without delay.

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

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Maintenance Guidelines

Scheduled Service Requirements

✓Professional inspection and service annually by certified Delta Electronics 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 fan operation and ventilation monthly

Proactive Maintenance Strategies

✓Keep panels clean to maximize energy production
✓Trim trees and vegetation to prevent shading
✓Ensure adequate ventilation around inverter
✓Monitor production trends 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 E11 (Charger Error) mean?

Error code E11 indicates that the charger is damaged. Contact Delta service personnel. Do not attempt to repair yourself. The charger may need to be replaced. This requires professional diagnosis.

What does error code E12 (Fan Error) mean?

Error code E12 indicates that the fan is damaged or blocked. Check if fan ventilation is normal, check if fan is running normally, clean filters if installed, reduce load if possible, and contact Delta service personnel if the fan continues to fail.

What does error code E13 (Overtemperature) mean?

Error code E13 indicates that the inverter temperature is too high. Check if inverter ventilation is normal, reduce load if possible, check if fan is running normally, clean filters if installed, improve ventilation around inverter, ensure inverter is not in direct sunlight, and allow inverter to cool down before restart. Contact installer if temperature remains high after improving ventilation.

What does error code E14 (+/- DC BUS High/Low) mean?

Error code E14 indicates a DC bus irregularity detected. Contact Delta service personnel. This is an internal error requiring professional diagnosis. Do not attempt to repair yourself. May require inverter service or replacement.

What should I do if I see "Ground Current" error?

Ground Current error indicates that ground current has been detected. Do not attempt to start the system. Inspect all PV modules for physical damage, check all DC connections and junction boxes, test ground current and isolation resistance, check for water ingress, and inspect DC wiring for damage. This is a serious safety condition. Contact a certified installer to perform ground fault testing.

Can I repair my Delta Electronics 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 Delta Electronics installers. Unauthorized work on electrical systems poses extreme danger and violates building codes.

What does "HW DSP ADC1" error mean?

HW DSP ADC1 error indicates a hardware DSP ADC1 error - an internal error. Contact Delta inverter service immediately. This is an internal error requiring professional diagnosis. Do not attempt to repair yourself. May require inverter service or 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 Delta Electronics solar system troubleshooting. This comprehensive reference enables quick problem identification and guides appropriate response actions. Delta Electronics systems utilize error codes displayed on inverter displays, LED status indicators, and status messages in the monitoring portal to indicate specific sensor and system malfunctions. Delta Electronics 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: Ground Current, Isolation Fault, HW DSP ADC1, and E14 (+/- DC BUS High/Low). These indicators represent serious safety hazards requiring certified Delta Electronics 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 unit's installation and service manual for precise interpretations.