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High Flow Temperature

Flow temperature too high - Higher than calculated or set

Junkers · Cerapur 9000i Boiler

What does High Flow Temperature mean?

The measured flow temperature in the heating system is higher than what is calculated or set. This is a non-blocking interference, meaning the heating system remains in operation but may not perform optimally.

Common Causes

  • Heating water temperature setting is too high
  • Thermostat malfunction
  • Incorrect heating curve setting

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the heating water temperature settings on the device and adjust if necessary.

  2. 2

    Verify the room thermostat is functioning correctly and set appropriately.

  3. 3

    If outdoor temperature-compensated control is used, check and adjust the heating curve in the room controller.

Browse all codes in this manual (48)
Verified technical data. Last updated: April 2026

Related Faults

0.9 BAR0.9 BAR — Low operating pressure101Code 101 - Mains voltage lower than allowed1019Code 1019 - Flame formation after burner switches off
Source: Junkers Cerapur 9000i Boiler
Open Manual (Page 36)Search more codes in this manual