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E077

E077 — 24 V operating voltage for sensor defective

Wilo · Wilo-Stratos GIGA Pumps

What does E077 mean?

The 24 V operating voltage for the sensor is faulty, indicating a problem with the sensor itself or its connection.

Common Causes

  • Defective sensor
  • Incorrectly connected sensor
  • Faulty 24V supply to sensor

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 and wired.

  3. 3

    Verify the 24V supply to the sensor is stable.

Browse all codes in this manual (40)
Verified technical data. Last updated: April 2026

Related Faults

3 red flashes3 red flashes — Communication errorE.025E.025 — General error codeE000E000 — System OK / No error
Source: Wilo-Stratos GIGA Pumps
Open Manual (Page 55)Search more codes in this manual