Danfoss Error 1027 is primarily an internal hardware or configuration fault commonly associated with the VLT Micro Drive FC 51
and certain solar inverter models. Depending on your specific Danfoss device, the error indicates a failure in the internal DC interface or a critical power board malfunction. Solis Inverters Error Meaning by Device Type VLT Micro Drive (FC 51
Error 1027 is typically labeled as an "Internal Error". It often points to a failure on the power card or a communication break between the internal control components. Solar Inverters (Solis/Danfoss variants): Code 1027 refers to a DC-INTF (DC Interface)
fault. This means the inverter has detected an issue with the internal DC power stage, often triggered by improper string connections or internal hardware damage. Solis Inverters Troubleshooting Steps Perform a Hard Reset Disconnect all AC and DC power from the unit. Wait at least 5–10 minutes for the internal capacitors to fully discharge.
Reconnect power and check if the error clears. If it recurs immediately, the fault is likely permanent hardware damage. Verify Digital Inputs (VFDs) Check if any digital input is programmed as an External Interlock
If a terminal is set for this function but is not receiving a 24V signal, the drive may trip. Ensure a jumper exists between terminal 12 (24V DC) and the programmed input. Check DC String Connections (Solar Inverters) MC4 connectors for loose connections or poor crimping.
Verify the polarity of all DC strings connected to the inverter. Measure the Voc (Open Circuit Voltage)
of PV strings using a multimeter to ensure they are within the inverter's operating range. Inspect Internal Power Board
If the error persists after a reset, it often indicates a failed power supply board or a locked-up main contactor
Check for visible signs of damage, such as blown fuses or scorched components on the internal boards. When to Seek Support
If a power cycle does not clear Error 1027, it is generally considered a non-resettable internal fault . You should contact a Danfoss Service Partner danfoss error 1027
or your supplier, as the unit may require a control card or power module replacement. parameter settings for your Danfoss model to check the error log history? Top ten VFD tech support calls - Danfoss
Danfoss Error Code 1027: Technical Fault Report In Danfoss VLT drives (such as the Error Code 1027 typically indicates a specific category of Internal Fault
that prevents the drive from starting or operating correctly Fault Description Error Type : Internal Error / System Fault. Common Trigger
: This code often appears when the drive's internal control system detects a hardware mismatch or a software-level failure that it cannot automatically resolve. Secondary Context
: In some troubleshooting contexts, a fault in this range may be associated with overvoltage conditions where the incoming supply exceeds safe operational limits. JustAnswer Immediate Troubleshooting Steps Power Cycle
: Disconnect the mains supply completely and wait for the display to turn off (allow at least 5–15 minutes for DC link capacitors to discharge) before reconnecting power. Verify Input Voltage
: Use a multimeter to check that the incoming AC mains voltage is stable and within the drive's specified nameplate range. Manual Reset : Press the
button on the Local Control Panel (LCP) to attempt to clear the alarm. Hardware Check
: Ensure all option cards and internal wiring connections are secure. Øwre-Johnsen Advanced Recovery: Manual Initialization
If a standard reset does not clear the error, you may need to perform a Manual Initialization to return the drive to factory default settings. This will erase all user-programmed parameters. MyDrive® Assistant Power off the drive. Press and hold the [Main Menu] keys simultaneously. Danfoss Error 1027 is primarily an internal hardware
Power on the drive while continuing to hold the keys for 5 seconds.
Release the keys; the drive should now be in its default state. MyDrive® Assistant Recommendation
If Error 1027 persists after power cycling and initialization, it indicates a critical internal hardware failure
(likely the power board or control card). You should contact a certified Danfoss Service Department for repair or replacement. Top ten VFD tech support calls - Danfoss
Understanding and Troubleshooting Danfoss Error 1027: A Comprehensive Guide
Danfoss is a well-known manufacturer of industrial and commercial refrigeration, air conditioning, and heating systems. Their products are widely used in various industries, including retail, food processing, and HVAC. However, like any complex system, Danfoss products can sometimes experience errors and malfunctions. One common error code that users may encounter is Danfoss Error 1027. In this article, we will explore what Danfoss Error 1027 means, its causes, and troubleshooting steps to help you resolve the issue.
What is Danfoss Error 1027?
Danfoss Error 1027 is a specific error code that appears on Danfoss control systems, indicating a problem with the system's operation. The error code is usually displayed on the control panel or screen of the Danfoss device. When Error 1027 occurs, it can disrupt the normal functioning of the system, leading to reduced performance, increased energy consumption, or even complete system shutdown.
Causes of Danfoss Error 1027
The causes of Danfoss Error 1027 can vary depending on the specific product and system configuration. However, based on common issues reported by users and Danfoss support teams, some possible causes of Error 1027 include: Symptoms of Danfoss Error 1027 Before the error
Symptoms of Danfoss Error 1027
Before the error code appears, you may notice some symptoms that indicate a problem with the system. These symptoms can include:
Troubleshooting Danfoss Error 1027
To resolve Danfoss Error 1027, follow these troubleshooting steps:
Advanced Troubleshooting Steps
If the basic troubleshooting steps do not resolve the issue, you may need to perform more advanced troubleshooting steps, such as:
Preventing Danfoss Error 1027
To prevent Danfoss Error 1027 from occurring in the future, follow these best practices:
Conclusion
Understanding the root cause is 80% of the repair. Field data from hundreds of service calls show these six causes dominate.
| Cause | Likelihood | Explanation | |-------|------------|-------------| | Shorted brake resistor | High | Low-ohm short (<< rated value) draws excessive current, killing the IGBT. | | Wiring short | Medium | Brake resistor cable chafed, terminal box moisture, incorrect polarity (if using DC bus braking). | | Brake resistor value too low | Medium | Resistor ohms below minimum allowed for the drive model. | | IGBT natural failure | Medium | Age, thermal cycling, poor quality power supply, or voltage spikes. | | Control board / gate drive fault | Low | Faulty gate driver keeps IGBT turned on. |
Seeing Alarm 1027 on your Danfoss VFD can be intimidating, but don’t panic. This error indicates an internal hardware fault within the drive’s control card or power components. It is a critical error that usually requires drive repair or replacement, but there are a few steps you can take before calling for service.