Alarm signal activated — Pump has registered a fault

What does Alarm signal mean?

The pump's signal relay (Relay 2 by factory default) is activated, indicating that the Grundfos MAGNA3 pump has registered an internal fault. This signal is typically connected to an external fault indicator or a building management system.

• The pump has detected an internal fault or operational issue.
• External connection issues with the relay output wiring.
• Temporary interruption or instability in the power supply to the pump.

Click steps to track your progress.

1. 1

   Check the pump's display (if available) for any specific error messages or codes that may provide more details about the registered fault.

2. 2

   Verify that the power supply to the Grundfos MAGNA3 pump is stable and has not been temporarily switched off.

3. 3

   If no specific error is displayed, try performing a soft reset of the pump by cycling its power supply (turn off power, wait 30 seconds, then turn power back on).

4. 4

   Inspect the wiring for the relay output (C, NC, NO terminals) for any loose or damaged connections that could affect the signal.

5. 5

   If the alarm signal persists after these steps, contact a qualified technician for further diagnosis and service.