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Pump communication fault

Pump communication fault — Communication with the pump failed

Grundfos · MAGNA3 Pump

What does Pump communication fault mean?

This error means the pump is unable to communicate with its control system, a remote device, or other pumps in a multi-pump setup. This can prevent proper monitoring and control.

Common Causes

  • Loose or damaged communication cables.
  • Interference in the communication signal.
  • Incorrect network settings or pump address.
  • Temporary software glitch.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all communication cables connected to the pump and ensure they are securely fastened.

  2. 2

    Restart the pump by cycling its power off and then on again.

  3. 3

    Verify the communication settings in the pump's menu or associated app match the system requirements.

  4. 4

    If part of a multi-pump system, check the communication status of other pumps.

Browse all codes in this manual (24)
Verified technical data. Last updated: April 2026

Related Faults

10Alarm 10 — Communication fault between electronic parts29Alarm 29 — Forced pumping, flow through stopped pump40, 75Alarm 40 or 75 — Supply voltage too low
Source: Grundfos MAGNA3 Pump
Open Manual (Page 21)Search more codes in this manual