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Hot Water Outlet Temp

Hot water outlet temperature is not reached

Junkers · Cerapur 9000i Boiler

What does Hot Water Outlet Temp mean?

The boiler is unable to reach the desired or set hot water outlet temperature, indicating an issue with heating or heat transfer.

Common Causes

  • Incorrect gas type setting
  • Incorrect gas/air ratio
  • Faulty gas valve
  • Clogged plate heat exchanger or faulty turbine

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the gas type setting to ensure it matches the supplied gas.

  2. 2

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

  3. 3

    Inspect the plate heat exchanger for blockages and the turbine for proper function.

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

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Source: Junkers Cerapur 9000i Boiler
Open Manual (Page 40)Search more codes in this manual