Grundfos Grundfos Pump Error Code 12

Grundfos Pump Major Hardware

Model: Grundfos Pump | Code: 12

Applicable Systems
MAGNA1

Symptoms

Encoder fault. The motor encoder feedback signal is missing or invalid.

Possible Causes

  • Encoder hardware failure
  • Encoder cable damaged or connector loose

Troubleshooting Steps

  1. Step 1: Check the encoder cable and connector
    Cable is damaged or connector is loose
  2. Step 2: Verify the encoder signal with an oscilloscope
    No signal from the encoder

How to Reset

To reset: Replace the encoder or fix the cable, then reset the controller.

Related Grundfos Fault Codes

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Source: Grundfos Pump Troubleshooting Guide, Grundfos Group

Category: Pump