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Relay 2 (Not Ready Due to Fault)

External Ready Signal Not Activated - Pump has registered a fault and cannot run

Grundfos · MAGNA3 Pumps

What does Relay 2 (Not Ready Due to Fault) mean?

The pump's external signal relay (Relay 2, if configured as Ready) is not activated, indicating that the pump has registered a fault and is unable to run. This signal is typically sent to an external building management system (BMS) or control panel.

Common Causes

  • A fault prevents the pump from starting or continuing operation.
  • The pump is in a fault state and cannot be commanded to run.
  • Internal issue or protective shutdown activated.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

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

  2. 2

    Open the Grundfos GO app to access detailed pump status, warnings, and alarms.

  3. 3

    Safely disconnect power to the pump for at least 30 seconds, then restore power to clear temporary issues.

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