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Relay 1 (Alarm Activated)

External Alarm Signal Activated - Pump has registered a fault

Grundfos · MAGNA3 Pumps

What does Relay 1 (Alarm Activated) mean?

The pump's external signal relay (Relay 1, if configured as Alarm) has activated, indicating that the pump has registered a fault. This signal is typically sent to an external building management system (BMS) or alarm panel.

Common Causes

  • Internal pump malfunction or critical operating error.
  • Power supply issue to the pump.
  • External system conditions causing the pump to fault.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the Grundfos MAGNA3 pump's control panel display for specific alarm messages or fault codes.

  2. 2

    Use the Grundfos GO app to connect to the pump and view the current status and operating log.

  3. 3

    Verify the power supply to the pump is stable and uninterrupted.

Browse all codes in this manual (10)
Verified technical data. Last updated: April 2026

Related Faults

Alarm 10Alarm 10 — Internal fault, circuit board connection lostAlarm 51Alarm 51 — Blocked pump, pump stops and tries to restartAlarm 72Alarm 72 — Internal fault, pump stops and tries to restart
Source: Grundfos MAGNA3 Pumps
Open Manual (Page 41)Search more codes in this manual