Internal fault — An internal system error has occurred

What does Internal fault mean?

This general fault indicates an issue within the pump's internal electronics or software that prevents it from functioning correctly. It requires attention to diagnose the specific problem.

• Electronic component failure.
• Software malfunction or corruption.
• Internal sensor reading error.
• Overheating of internal components.

Click steps to track your progress.

1. 1

   Turn off the pump and unplug it from the power supply. Wait for at least 30 seconds before plugging it back in and restarting.

2. 2

   Check if the pump is installed in an environment within its specified operating temperature range.

3. 3

   Ensure the pump's control panel and connections are clean and free from moisture or damage.

4. 4

   If the fault persists, consult the full service manual or contact Grundfos support.