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Hot Water Quantity

Hot water quantity is not reached

Junkers · Cerapur 9000i Boiler

What does Hot Water Quantity mean?

The boiler is not providing the expected volume or flow rate of hot water, even if the temperature might be acceptable.

Common Causes

  • Low gas connection pressure
  • Faulty gas valve
  • Incorrect gas/air ratio

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the gas connection pressure.

  2. 2

    Check the gas valve and replace if necessary.

  3. 3

    Check the gas/air ratio and correct if necessary (requires technician).

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 40)Search more codes in this manual