Warning 84 or 157 — Internal fault

What does 84, 157 mean?

A fault has been detected within the pump's electronics. This is a warning and does not activate the alarm relay, indicating a less critical issue than an alarm.

• Faulty pump electronics.
• Turbine operation (unwanted flow) in the application.

Click steps to track your progress.

1. 1

   Check for any signs of turbine operation where external flow might be influencing the pump.

2. 2

   Cycle the pump's power by switching it off and on at the main supply.

3. 3

   If the warning persists, contact Grundfos Service for further diagnosis or possible replacement.