Fagor alarm E804: Defective encoder (with motor feedback)

What it means

The motor feedback device was detected but reports internal defects or responses outside specification, so the drive rejects it. Fagor's instruction for this code is replacement via Fagor Automation service — usually meaning the integrated encoder is failing and the motor needs encoder service or exchange.

Likely causes

• integrated encoder electronics intermittently failing with temperature/vibration
• contamination inside encoder housing (oil mist, swarf)
• repeated flexing damage where the feedback cable exits the motor

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• Encoder module for FXM/FKM/FM7 motor (model-specific service kit)

  encoder · Common cause

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