Grundfos · MAGNA3 Pump
This fault indicates that the electrical supply voltage to the pump has dropped below the acceptable operating range. Insufficient voltage can lead to motor damage or unreliable operation.
Click steps to track your progress.
Check the circuit breaker supplying power to the pump; reset if tripped.
Verify the main power supply to the pump is stable and within the specified voltage range using a multimeter if comfortable and safe to do so.
Ensure all electrical connections to the pump are tight and secure.
If the issue persists, contact a qualified electrician to inspect the electrical installation.