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Yellow light running

Yellow indicator light running — Pump running with warning

Grundfos · MAGNA3 Pump

What does Yellow light running mean?

The Grundfos Eye displays a single yellow light moving in the direction of pump rotation. This indicates that the pump is currently running but an operational warning has been detected.

Common Causes

  • An operational condition requires attention.
  • Unusual operating parameters are detected by the pump.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the pump's display or the Grundfos GO Remote app for specific warning messages.

  2. 2

    Refer to the 'Assisted fault advice' menu (Page 34) for more guidance on warnings.

  3. 3

    Address any specific warning conditions identified (e.g., low system pressure).

  4. 4

    If the warning persists or escalates to an alarm, contact Grundfos Service.

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 37)Search more codes in this manual