What does Danfoss FC302 VFD Alarm 80 - Causes & Fix mean?

Alarm 80 means the Danfoss FC302 drive has been initialized to default values. Clear the alarm by resetting the unit, then reload your saved parameter set.

How do I fix Danfoss FC302 VFD Alarm 80 - Causes & Fix?

Work through the step-by-step fix below. Start with the quick reset and the most common cause, then check the specific part this guide points to. Most fixes need only basic hand tools and the right replacement part.

Can I keep using my Danfoss appliance with FC302 showing?

Usually not. Danfoss appliances show this error when a part or safety circuit is out of range, so running it can stop the cycle or make the problem worse. Diagnose and clear the error before normal use.

What part is most commonly replaced for Danfoss FC302 VFD Alarm 80 - Causes & Fix?

The parts that most often fix Danfoss FC302 VFD Alarm 80 - Causes & Fix are listed in the parts section of this guide. Match the part to your exact model and serial number before you buy.

Is Danfoss FC302 VFD Alarm 80 - Causes & Fix a DIY repair or do I need a technician?

Many fixes are DIY-friendly with basic tools, such as door switches, drain pumps, water inlet valves, thermostats, heating elements, and filters. Sealed-system, refrigerant, gas, or high-voltage work should go to a licensed technician for safety.

Danfoss FC302 VFD Alarm 80 - Causes & Fix

Danfoss FC302 VFD Alarm 80 — What It Means

Alarm 80 on a Danfoss VLT AutomationDrive FC 302 indicates the drive has been initialized to default values. This is not a hardware fault. The drive’s parameter settings have been reset to factory defaults, typically after a manual reset or commissioning procedure. Danfoss documentation describes this as “Drive initialised to default value” and notes that it appears when the drive powers up after a successful initialization. The alarm itself signals that your custom application parameters have been replaced with the factory baseline settings, rather than pointing to a failed power component or motor issue.

Jump to Fix

Common Causes

Manual reset or initialization A deliberate reset procedure or commissioning process that restores all parameters to factory defaults.
Lost parameter set after service Configuration was overwritten or erased during control board replacement, parameter download, or maintenance work.
Interrupted parameter download A parameter transfer or programming session was stopped partway through, leaving the drive in default state.
Control board replacement without parameter restore A new or swapped control card was installed but the saved application parameters were not reloaded.
Unexpected configuration loss The drive reverted to defaults on its own, suggesting a problem with parameter storage on the control side.

Step-by-Step Fix

Verify whether the reset was intentional. If you just commissioned the drive or performed a manual reset, confirm that returning to factory defaults was the goal and check whether your application parameters need to be reloaded.
Clear the alarm by resetting the unit. Danfoss specifies that Alarm 80 is cleared by performing a reset on the drive.
Cycle power to the drive. Turn off main power, wait 30 seconds, then restore power to see whether Alarm 80 returns on its own.
Reload your saved parameter set from backup. If the drive has reverted to defaults and you have a backup file or written parameter list, download or re-enter the correct application settings now.
Check commissioning integrity if the alarm recurs. Confirm that the correct parameters are present, that any replaced control card is programmed properly, and that the drive is not losing settings between power cycles.
Inspect the control card and parameter storage. If Alarm 80 appears repeatedly without manual resets, suspect a control board or memory retention problem rather than a motor or output-stage fault.
Document your final parameter set. Once the drive is running with the correct application settings, save a backup file and keep a written copy to simplify future recovery.

Parts Often Needed

Part	Notes
Danfoss FC302 control card (PCB)	Amazon \| Required if the drive cannot retain or restore parameter settings and Alarm 80 recurs after each power cycle.
Parameter backup file or commissioning record	Amazon \| Not a physical part but essential for restoring your application settings after a reset to defaults.

When to Call a Pro

Call a qualified drives technician or Danfoss service partner if Alarm 80 reappears on its own after you have cleared it and cycled power, especially if you did not perform a manual reset. Recurring initialization to defaults without user intervention points to a control card or parameter storage issue that requires diagnostic tools and familiarity with VFD commissioning. Also seek professional help if you do not have a backup of your application parameters and the drive controls a complex process, because incorrect motor control settings can damage equipment or create unsafe operating conditions.