Grundfos Grundfos Pump Error Code 4

Grundfos Pump Major Power

Model: Grundfos Pump | Code: 4

Applicable Systems
MAGNA1

Symptoms

Underload. The pump motor current is below the expected value, indicating possible dry running or cavitation.

Possible Causes

  • Pump running dry or air in the system
  • Impeller damaged or worn reducing load

Troubleshooting Steps

  1. Step 1: Check the motor current
    Current is below the expected value
  2. Step 2: Verify the pump is primed and the impeller is intact
    Pump is dry or impeller is worn

How to Reset

To reset: Prime the pump or replace the impeller, then reset the controller.

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Source: Grundfos Pump Troubleshooting Guide, Grundfos Group

Category: Pump