CodeRegistry
Brands
  1. Home
  2. Wilo
  3. VeroLine and VeroTwin Pumps
  4. E004
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

E004

E004 — Undervoltage detected

Wilo · VeroLine and VeroTwin Pumps

What does E004 mean?

The voltage supplied to the pump is lower than the acceptable operating range. This can affect pump performance and longevity.

Common Causes

  • Main power supply is overloaded.
  • Inadequate electrical installation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if other high-power devices are running simultaneously on the same circuit.

  2. 2

    Verify the electrical installation meets the pump's power requirements.

  3. 3

    Contact an electrician to inspect the power supply.

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 51)Search more codes in this manual