Alarm 64 — High motor temperature

What does 64 mean?

The temperature within the stator windings of the pump's motor has become too high, leading to an alarm and the pump stopping. This alarm does not automatically reset.

• Overload on the pump, causing excessive heat.
• Insufficient cooling around the motor or in the Pumpd liquid.
• Electrical issues causing abnormal heat generation within the motor.

Click steps to track your progress.

1. 1

   Switch off the power supply to the pump and allow it to cool down completely.

2. 2

   Check for any blockages or restrictions in the system that might cause the pump to work harder than usual.

3. 3

   Ensure the pump's environment allows for adequate ventilation and cooling.

4. 4

   If the alarm persists after cooling and checking for obstructions, contact Grundfos Service, as pump replacement might be needed.