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E077

E077 — 24 V operating voltage for differential pressure sensor defective

Wilo · VeroLine and VeroTwin Pumps

What does E077 mean?

The 24-volt power supply for the differential pressure sensor is not working, or the sensor itself is faulty or incorrectly connected.

Common Causes

  • Differential pressure sensor is defective.
  • Differential pressure sensor is connected incorrectly.
  • Faulty 24V power supply within the electronics.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the connection of the differential pressure sensor.

  2. 2

    Ensure the sensor is correctly installed according to the manual.

  3. 3

    If connections are fine, contact customer service.

Browse all codes in this manual (45)
Verified technical data. Last updated: April 2026

Related Faults

3 red flashes3 red flashes — Communication error6.0.0.0 flashes6.0.0.0 flashes — Ready to acknowledge error6.0.0.0 steady6.0.0.0 steady — Error acknowledgement countdown active
Source: Wilo VeroLine and VeroTwin Pumps
Open Manual (Page 52)Search more codes in this manual