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Blocked pump

Blocked pump — Pump impeller is obstructed

Grundfos · MAGNA3 Pump

What does Blocked pump mean?

This indicates that the pump's impeller or moving parts are physically blocked, preventing the pump from operating correctly. This can lead to reduced performance or complete stoppage.

Common Causes

  • Debris in the system (e.g., rust, sediment, foreign objects).
  • Air lock in the pump.
  • Malfunctioning bearing or motor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the pump and disconnect it from the power supply for safety.

  2. 2

    Carefully inspect the pump housing and inlet/outlet pipes for any visible obstructions or debris.

  3. 3

    Refer to the full manual for specific instructions on how to access and clear the impeller area, if applicable.

  4. 4

    Restore power and test the pump's operation.

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