Yellow LED lit — Pump warning, still operating but not as expected

What does Yellow LED mean?

When the warning and alarm symbol on the operating panel turns yellow, the pump is in a warning state. It continues to run, but its performance may not be optimal, potentially leading to issues like insufficient heating. An error code will alternate on the display.

• Minor issue affecting performance
• Blocked rotor (potentially indicated by PWM feedback)
• Insufficient heating or discomfort in the system

Click steps to track your progress.

1. 1

   Look for a specific error code alternating on the pump's display.

2. 2

   Connect to the Grundfos GO app to obtain a detailed error description.

3. 3

   If the operating panel is in power saving mode, press the Selection button to reveal the error code.

4. 4

   Follow the specific troubleshooting guidance provided by the app for the identified error code.