Danfoss VLT Alarm 104: Hybrid fan fault

Danfoss Electrical Alarm Drive

Model: VLT 2800 / FC Series | Code: 104

Applicable Systems
FC-302 FC-301

Symptoms

Hybrid cooling fan malfunction.

Possible Causes

  • Hybrid fan fault

Troubleshooting Steps

  1. Step 1: Check fan operation; replace if faulty.
    Fault resolved after action

How to Reset

Reset by: 1) Correct the fault condition. 2) Press RESET button or cycle power. 3) Verify fault does not recur.

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Source: Danfoss FC Series Alarm Codes (agilectrl.com)

Category: Electrical

Published: 2026-09-28