E3 / Code 43 — Forced pumping detected

What does 43 mean?

The warning and alarm symbol is permanently yellow, the display shows error code E3, and the pump continues to run. This indicates that other pumps or external sources are creating an unintended flow through this pump.

• Other pumps or sources create a flow through the pump.
• Incorrectly positioned or defective non-return valves in the system.

Click steps to track your progress.

1. 1

   Check the system to ensure non-return valves are correctly positioned.

2. 2

   Inspect non-return valves for defects and replace them if necessary.

3. 3

   Ensure no other external factors are forcing flow through the pump.

4. 4

   Reset the warning via Grundfos GO if it persists after checking the system.