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E040

E040 — Pressure/volume flow sensor fault

Wilo · Control EC-Fire Pump

What does E040 mean?

This error means the pressure or volume flow sensor is not working correctly. It could be defective or have lost its electrical connection.

Common Causes

  • Sensor is defective
  • No electrical connection to the sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the sensor is securely connected.

  2. 2

    If the sensor appears loose, reconnect it firmly.

  3. 3

    If the sensor is suspected to be defective, it may need to be replaced.

  4. 4

    If the electrical connection is the issue, repair it according to the installation guide.

Browse all codes in this manual (14)
Verified technical data. Last updated: April 2026

Related Faults

1 red flash — 1 green flashAlternating red and green flashes — Pump failure detectedDisplay shows alternating error codeDisplay shows error code — Specific fault informationE006E006 — Rotating field error
Source: Wilo Control EC-Fire Pump
Open Manual (Page 35)Search more codes in this manual