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Building does not get warm

Building does not get warm - Heating output too low

Wilo · Yonos PICO Pumps

What does Building does not get warm mean?

The building is not getting warm, suggesting the thermal output of the heating surfaces is too low for the pump's current setting.

Common Causes

  • Thermal output of heating surfaces is too low
  • Incorrect pump settings

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Increase the setpoint temperature for heating.

  2. 2

    Consider setting the control mode to Δp-c (differential pressure constant).

  3. 3

    Ensure the pump is appropriately sized for the heating system.

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 activeE04E04 - Undervoltage detectedE05E05 - Overvoltage detected
Source: Wilo Yonos PICO Pumps
Open Manual (Page 19)Search more codes in this manual