Undervoltage (40, 75) - Supply voltage is too low

What does 40, 75 mean?

The electrical supply voltage to the pump is below the specified operating range. This alarm prevents the pump from functioning correctly or starting.

• Instability or sags in the main power supply.
• An issue with the circuit providing power to the pump.
• Incorrect electrical wiring or connections leading to lower than specified voltage.

Click steps to track your progress.

1. 1

   Switch off the pump at the main power supply.

2. 2

   Consult a qualified electrician to check the incoming voltage at the pump's connection point.

3. 3

   Ensure the power supply is stable and within the voltage range specified for the Grundfos ALPHA3 pump.

4. 4

   Only restore power once the undervoltage issue is confirmed to be resolved and stable.