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1 red flash — 1 green flash

Alternating red and green flashes — Pump failure detected

Wilo · Control EC-Fire Pump

What does 1 red flash — 1 green flash mean?

This visual signal indicates that one of the connected pumps has failed. The system will automatically attempt to switch to a functional pump (standby pump).

Common Causes

  • A pump has malfunctioned or stopped working.
  • A fault has occurred in one of the pumps.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Note any error codes displayed on the LCD screen.

  2. 2

    Check the status of the failed pump by consulting its specific manual.

  3. 3

    Investigate the cause of the pump failure.

  4. 4

    Once the failed pump is repaired or replaced, acknowledge the fault on the switchgear.

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

Related Faults

Display shows alternating error codeDisplay shows error code — Specific fault informationE006E006 — Rotating field errorE022.xE022.x — Insulation fault
Source: Wilo Control EC-Fire Pump
Open Manual (Page 42)Search more codes in this manual