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6/l/

Blocking fault 6/l/ (2/2/9) - Insufficient ionization current during operating phase

Buderus · Logamax plus Boilers

What does 6/l/ mean?

The system has detected an insufficient ionization current while the burner should be operating normally. This means the flame is not stable or has gone out during operation. This is a blocking fault, requiring a manual reset.

Common Causes

  • Unstable gas supply
  • Dirty burner
  • Faulty electrode
  • Poor combustion

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press the 'Reset' button on the BC10 basic controller.

  2. 2

    Ensure the gas supply to the boiler is consistent and not interrupted.

  3. 3

    If the fault persists, contact a qualified service technician to inspect the burner and gas supply components.

Browse all codes in this manual (43)
Verified technical data. Last updated: April 2026

Related Faults

--/Flashing --/ - Communication fault between UBA 3 and BC10 controller0/y/Locking fault 0/y/ (2/8/5) - Return temperature sensor detected over 203°F (95°C)1/a/Blocking fault 1/a/ (3/1/6) - Flue gas sensor temperature too high
Source: Buderus Logamax plus Boilers
Open Manual (Page 48)Search more codes in this manual