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Blown fuse

Not operating - A fuse in the installation is blown

Grundfos · ALPHA3 Pump

What does Blown fuse mean?

The pump is not receiving power and is consequently not operating because a fuse in the electrical installation has blown.

Common Causes

  • Overcurrent in the electrical circuit connected to the pump.
  • A short circuit in the pump or wiring.
  • The fuse has reached the end of its lifespan or is undersized.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Switch off the main power supply to the pump's circuit at the consumer unit or fuse box.

  2. 2

    Locate the fuse box for your installation and identify the blown fuse (often with a visible break or blackening).

  3. 3

    Replace the blown fuse with a new one of the exact same type and current rating.

  4. 4

    Restore power to the circuit and check if the pump starts operating normally.

  5. 5

    If fuses blow repeatedly, consult a qualified electrician to investigate the underlying cause.

Browse all codes in this manual (22)
Verified technical data. Last updated: April 2026

Related Faults

157Real-time clock out of order (157) - Internal clock malfunction40, 75Undervoltage (40, 75) - Supply voltage is too low43Turbine operation (43) - Other water sources are flowing through the stopped pump
Source: Grundfos ALPHA3 Pump
Open Manual (Page 21)Search more codes in this manual