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E3

E3: electrical fault

Grundfos · ALPHA2 Pumps

What does E3 mean?

This indicates an internal electrical problem within the pump's motor or its control system. It signifies a hardware failure or malfunction.

Common Causes

  • Internal short circuit within the motor or wiring.
  • Failure of an electronic component on the control board.
  • Overheating causing damage to electrical parts.
  • Water ingress affecting electrical components.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the power to the pump at the main electrical breaker.

  2. 2

    Wait for at least 30 seconds, then restore power to attempt a reset of the pump's electronics.

  3. 3

    Inspect the pump for any visible signs of damage, burn marks, or moisture around electrical parts.

  4. 4

    If the fault persists after resetting, this typically indicates an internal component failure requiring professional service.

  5. 5

    Contact a qualified technician or the manufacturer's support.

Browse all codes in this manual (4)
Verified technical data. Last updated: April 2026

Related Faults

E1E1: blocked rotorE2E2: insufficient supply voltageE4E4: dry-run
Source: Grundfos ALPHA2 Pumps
Open Manual (Page 11)Search more codes in this manual