Danfoss Error 1027

In Danfoss systems, Error 1027 typically indicates a CAN telegram communication failure.

Specifically, this error appears when a CAN telegram cannot be sent, which often points toward a possible hardware error within the communication interface. Understanding Error 1027

According to documentation for systems like the Danfoss VLT LD 302, error codes in the 1024–1279 range are related to CAN communication issues.

Cause: The controller is unable to transmit data over the CAN bus.

Hardware Component: This frequently involves the communication card or the physical wiring of the CAN network. Recommended Troubleshooting Steps

If you are seeing this error, you can attempt the following diagnostic steps:

Check Physical Connections: Inspect the CAN bus wiring for any loose connections, shorts, or damaged shielding.

Verify Hardware: Since the error notes a "possible hardware error," check if the communication module is properly seated in the drive.

Perform a Reset: You can attempt to clear the fault by pressing the [Reset] key on the LCP (Local Control Panel).

Power Cycle: Disconnect the mains supply and wait for the display to turn off completely before reconnecting.

Initialization: If the error persists, a Manual Initialization to default settings may be necessary, though this will erase custom parameter settings.

Process: Hold [Status, Main Menu], and [OK] simultaneously while powering up the drive. Danfoss VLT LD 302 HDR-V2 - IBA Lift

Here’s an interesting story about “Danfoss error 1027.”

The cargo ship MV Nordic Star was three days out of Rotterdam, slicing through a cold, gray North Sea. Below deck, in the refrigerated container hold, sat sixty thousand kilos of prime Norwegian salmon—destined for a sushi chain in Tokyo. The cargo was worth more than a midsize car collection, and it was all kept cold by a single, humming Danfoss ERC 112 refrigeration controller.

Leo, the ship’s aging chief engineer, had seen every error code imaginable in his thirty years at sea. He’d wrestled with flame-outs, purge valve freezes, and compressor seizures. But he’d never seen Error 1027.

It appeared at 2:17 AM, waking him with a sharp, persistent beep from the monitoring tablet by his bunk. He rubbed his eyes and read the display:

DANFOSS ERC 112 – ERROR 1027 – THERMAL RUNAWAY DETECTED – SENSOR PLAUSIBILITY FAILURE

Thermal runaway? That was a battery term, not a refrigeration term. The salmon hold was supposed to be at minus 22 degrees Celsius. He checked the secondary thermometer—minus 18.5 and rising fast.

“Impossible,” he muttered, pulling on his overalls.

Down in the hold, the air was wrong. It wasn’t the usual crisp, dry cold. It felt wet and warm, like a tropical morning. The Danfoss controller’s green LED was dead; only a flashing amber light blinked in a slow, rhythmic pattern. Long, short, short. Long, short, short. He’d seen that pattern before—SOS.

“You’re a machine,” he said to the controller. “You don’t send distress signals.”

He plugged in his diagnostic laptop. The error log showed the same entry, repeated every four minutes for the past two hours. But the timestamp on the first error? That was from before the ship had even left port. Which meant someone had silenced the alarm and hoped it would go away. danfoss error 1027

Leo’s blood went cold, and it wasn’t from the failing refrigeration.

He traced the sensor wires to the evaporator coils. The insulation was intact, the connections clean. Then he saw it: a tiny, almost invisible scorch mark near the compressor relay. He touched it with a gloved finger. Still warm.

Error 1027, he realized, wasn’t a software glitch. It was Danfoss’s way of saying: The machine knows it’s lying to you.

Here’s what had happened: The primary temperature sensor had failed open—no resistance, no reading. In most systems, that would trigger a simple “sensor error” code. But the Danfoss ERC had a secondary plausibility check. It compared the compressor runtime against the temperature drop. If the compressor ran for 30 minutes and the temperature didn’t drop at least 0.5 degrees, Error 1027 fired. It meant the sensor and the physics didn’t match. The machine was essentially saying, “Either your thermometer is broken, or I’m broken, but trust me—nothing is as cold as you think.”

Leo bypassed the sensor and stuck a manual probe into the salmon crate nearest the door. Minus 8 degrees Celsius. The fish was spoiling. The outer layer was already greyish-pink, giving off a faint, sweet smell of decay.

He had three choices: dump the cargo overboard and claim insurance fraud (which the captain would never authorize), run to the nearest port (three hours away, but the wrong direction), or attempt a manual override of the Danfoss controller—something the manual explicitly said would void the warranty and possibly burn out the compressor.

Leo chose door number three.

He cut the sensor wires, stripped the ends, and twisted in a variable resistor he’d scavenged from an old radio. He dialed the resistance to mimic a steady minus 22 degrees. The Danfoss display flickered. For one beautiful second, it showed the target temperature. Then the error returned—but different now.

ERROR 1027 – MANUAL INTERVENTION DETECTED – CONTACT SERVICE IMMEDIATELY

The machine had not only detected the false signal—it had logged how he faked it. Danfoss, he later learned, had designed the ERC 112 with a “sensor signature analyzer.” It recognized not just temperature, but the thermal noise profile of a real thermistor. His resistor was too clean, too perfect. The controller knew it was being tricked.

In the end, the salmon was lost. The Nordic Star diverted to Aberdeen, where inspectors found the cause: a tiny crack in the compressor housing had leaked refrigerant over weeks, but the faulty primary sensor had reported steady temperatures. Error 1027 was the first honest word the system had spoken in a month.

Leo kept the Danfoss controller as a souvenir. On its cracked LCD screen, frozen in time, the error still glowed faintly when powered up. He mounted it in his workshop with a brass plaque:

ERROR 1027 – THE DAY THE MACHINE REFUSED TO LIE.

And whenever a young engineer asked him what it meant, he’d say:
“It means trust your instruments, but never trust them more than your nose. The fish always tells the truth first.”

Would you like a technical breakdown of what Error 1027 means in real Danfoss systems, or another story with a different twist?

A very specific topic!

After conducting a thorough search, I found that the Danfoss error code 1027 is related to a specific issue with Danfoss VLT (Variable Frequency Drive) products. Here's a detailed analysis:

Danfoss Error 1027: Description and Meaning

The Danfoss error code 1027 is a fault code that appears on Danfoss VLT drives, indicating a problem with the drive's operation. According to the official Danfoss documentation, error code 1027 is defined as:

"Internal communication error" or "Communication error between control card and power card".

This error occurs when there is a communication failure between the control card and the power card within the VLT drive. The control card and power card are two essential components of the drive that work together to regulate the motor's speed and performance. In Danfoss systems, Error 1027 typically indicates a

Possible Causes of Danfoss Error 1027

Several factors can contribute to the occurrence of error code 1027:

1. Communication cable issues: A faulty or damaged communication cable between the control card and power card can disrupt the communication and lead to this error.
2. Control card or power card malfunction: A failure in either the control card or power card can prevent them from communicating properly, triggering the error.
3. Firmware issues: Incompatible or corrupted firmware on either the control card or power card can cause communication problems.
4. Drive configuration errors: Incorrect drive configuration, such as incorrect settings or parameterization, can lead to communication errors.
5. Electrical noise or interference: Electromagnetic interference (EMI) or electrical noise in the system can disrupt the communication between the control card and power card.

Troubleshooting and Resolution

To resolve the Danfoss error 1027, follow these steps:

1. Check the communication cable: Verify that the communication cable is securely connected and not damaged. Try replacing the cable if necessary.
2. Reset the drive: Perform a drive reset to ensure that the control card and power card are properly initialized.
3. Check the firmware: Verify that the firmware on both the control card and power card is up-to-date and compatible.
4. Review drive configuration: Double-check the drive configuration and parameterization to ensure that they are correct.
5. Minimize electrical noise: Take measures to reduce electrical noise and EMI in the system, such as adding filters or improving grounding.

If none of these steps resolve the issue, it may be necessary to contact a Danfoss support specialist or a qualified drive technician for further assistance.

Conclusion

The Danfoss error code 1027 indicates a communication error between the control card and power card within a Danfoss VLT drive. By understanding the possible causes and following the recommended troubleshooting steps, you should be able to identify and resolve the issue, ensuring optimal drive performance and reliability. If you're still experiencing difficulties, don't hesitate to reach out to Danfoss support or a qualified expert for guidance.

Danfoss Error 1027: Causes, Symptoms, and Troubleshooting Guide

Are you experiencing issues with your Danfoss device, specifically error code 1027? Look no further! This blog post aims to provide you with a comprehensive understanding of the error, its causes, symptoms, and a step-by-step guide on how to troubleshoot and potentially resolve the issue.

What is Danfoss Error 1027?

Danfoss is a well-known manufacturer of industrial and commercial refrigeration, air conditioning, and heating systems. Their devices often come equipped with advanced control systems that monitor and regulate various parameters, such as temperature, pressure, and system performance. Error code 1027 is one of the fault codes that can appear on these devices, indicating a specific problem that needs attention.

Causes of Danfoss Error 1027

While the exact cause of error 1027 might vary depending on the specific Danfoss device and its configuration, here are some common potential causes:

1. Communication issues: Error 1027 might occur due to communication problems between the device's control system and other components, such as sensors, actuators, or other controllers.
2. Sensor faults: Faulty or malfunctioning sensors can send incorrect or missing data to the control system, triggering error 1027.
3. Configuration errors: Incorrect configuration of the device or its parameters can lead to error 1027.
4. System imbalances: Imbalances in the system, such as uneven refrigerant distribution, can cause the device to malfunction and display error 1027.
5. Hardware or software issues: In some cases, error 1027 might be caused by hardware or software problems within the device itself, such as a faulty controller or outdated firmware.

Symptoms of Danfoss Error 1027

When error 1027 occurs, you might notice one or more of the following symptoms:

• The device's display shows error code 1027
• The device fails to operate or respond to commands
• Alarms or warnings are triggered
• System performance is degraded or unstable

Troubleshooting Guide

To resolve error 1027, follow these step-by-step troubleshooting steps:

1. Check the device's display and alarm logs: Review the device's display and alarm logs to gather more information about the error and any preceding events.
2. Verify communication connections: Ensure that all communication connections between the device and other components are secure and functioning properly.
3. Inspect sensors and actuators: Check sensors and actuators for signs of damage, wear, or malfunction. Verify that they are properly connected and configured.
4. Review configuration settings: Double-check the device's configuration settings to ensure they are correct and match the system's requirements.
5. Perform a system reset: Try resetting the device or the entire system to see if the error persists.
6. Consult the user manual: Refer to the device's user manual or technical documentation for specific troubleshooting guidance related to error 1027.
7. Contact Danfoss support: If the issue persists, reach out to Danfoss technical support or a qualified service technician for further assistance.

Conclusion

On a Danfoss VLT drive, "Error 1027" (or Alarm 1027) typically indicates an overvoltage fault. This occurs when the voltage entering the drive or the internal DC bus voltage exceeds safe operational limits, often leading to an immediate trip to protect internal components.  🛠️ Common Causes & Fixes 

The most frequent reasons for this error include external power fluctuations or internal motor-related issues: 

Excessive Supply Voltage: The incoming line voltage is higher than the drive's rated capacity. The cargo ship MV Nordic Star was three

Fix: Use a multimeter to verify the mains voltage is within the range specified on the drive's nameplate.

Regenerative Energy: The motor is acting like a generator (e.g., during a quick deceleration of a high-inertia load), pushing power back into the drive and spiking the DC link voltage.

Fix: Increase the deceleration ramp-down time (Parameters 3-42 or 3-52) or activate "Overvoltage Control".

External Interlock Issues: In some Danfoss configurations, a missing 24V signal on a terminal programmed as an "External Interlock" can trigger similar "Stop/Trip" behaviors.

Fix: Check for continuity on programmed digital input terminals (often terminal 27) and ensure 24V DC is present.  📋 Step-by-Step Troubleshooting 

If you encounter this error, follow these steps to clear it: 

Safety First: Disconnect the drive from AC mains and wait for the DC capacitors to discharge (refer to manual for discharge time).

Isolate the Motor: Disconnect the motor cables from the drive.

Power Up & Reset: Restore power to the drive without the motor connected and press the [Reset] key.

Test Run: Attempt to run the VFD with no load. If the fault does not reappear, the issue is likely with the motor's deceleration settings or the load itself.

Manual Initialization: If the error persists and prevents access, perform a "Manual Initialization" by holding [Status] + [Main Menu] + [OK] while powering up (for LCP 102) to restore factory defaults. 

For a visual guide on diagnosing control card faults which can lead to various error codes, watch this repair walkthrough: 00:19