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E004

E004 — Undervoltage

Wilo · Wilo-Stratos GIGA Pumps

What does E004 mean?

The mains voltage is too low, potentially due to an overloaded electrical supply. Check the electrical installation.

Common Causes

  • Mains overloaded
  • Low mains voltage
  • Electrical installation fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the electrical installation for faults.

  2. 2

    Ensure the mains supply voltage is within the acceptable range.

  3. 3

    Reduce the load on the electrical circuit if possible.

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 54)Search more codes in this manual