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E7

E7 — Burner NTC has an interruption

Junkers · CERASTAR CERAMINI Boiler

What does E7 mean?

The NTC sensor for the burner has an interruption, meaning its signal is lost or discontinuous. This prevents accurate temperature measurement at the burner.

Common Causes

  • The burner NTC sensor is faulty or has failed.
  • The connection cable to the burner NTC sensor is damaged or disconnected.
  • Loose or corroded connections at the sensor or circuit board.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the burner NTC sensor and its connection cable for any visible damage or loose connections.

  2. 2

    Ensure all cable connections are secure and properly seated.

  3. 3

    If damage or fault is identified, replace the burner NTC sensor and/or its connection cable.

Browse all codes in this manual (20)
Verified technical data. Last updated: April 2026

Related Faults

A2A2 — Exhaust outlet at the combustion chamberA3A3 — Exhaust gas NTC on the flow control has open circuit or short circuitA4A4 — Exhaust outlet at the flow guard
Source: Junkers CERASTAR CERAMINI Boiler
Open Manual (Page 34)Search more codes in this manual