CodeRegistry
Brands
  1. Home
  2. Junkers
  3. Cerapur 9000i Boiler
  4. 356
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

356

Code 356 - BUS communication interrupted

Junkers · Cerapur 9000i Boiler

What does 356 mean?

Communication on the BUS system (internal network) of the boiler is interrupted. This can prevent components from communicating correctly.

Common Causes

  • Damaged BUS subscriber connection cable
  • Loose plug connections or wiring harness

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the BUS subscriber connection cable for any damage or interruptions.

  2. 2

    Inspect all plug connections and the wiring harness for proper contact.

  3. 3

    If a cable is damaged, replace it to restore communication.

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 39)Search more codes in this manual