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Hot Water Smell/Color

Hot water has bad smell or dark color

Junkers · Cerapur 9000i Boiler

What does Hot Water Smell/Color mean?

The domestic hot water has an unpleasant smell or appears discolored, which indicates issues with water quality or tank hygiene.

Common Causes

  • Defective protective anode in the storage tank
  • Need for thermal disinfection of the hot water circuit

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the protective anode in the hot water storage tank.

  2. 2

    Carry out thermal disinfection of the hot water circuit to eliminate bacteria.

  3. 3

    If issues persist, consult a plumber or technician.

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