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Red LED solid

Red LED solid - Fault signal active

Wilo · Yonos PICO Pumps

What does Red LED solid mean?

The fault signal LED lights up solid red, indicating an active fault condition. The pump may switch off and attempt to restart depending on the error code.

Common Causes

  • Various fault conditions (see specific error codes like E04, E05, E10, etc.)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Note the specific error code displayed on the LED display.

  2. 2

    Consult the manual for the meaning of the specific error code.

  3. 3

    Follow the remedy steps for the corresponding error code.

  4. 4

    If unable to resolve, contact customer service.

Browse all codes in this manual (17)
Verified technical data. Last updated: April 2026

Related Faults

Bars bottom to top blinkBars bottom to top blink - Pump venting function activeBuilding does not get warmBuilding does not get warm - Heating output too lowE04E04 - Undervoltage detected
Source: Wilo Yonos PICO Pumps
Open Manual (Page 20)Search more codes in this manual