Hardware Model Specification
Buderus Logamax plus GB122i.2 Diagnostics
Classification: HVAC & Condensing Boilers Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the Buderus Logamax plus GB122i.2.
1 Documented Faults
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Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for Logamax plus GB122i.2
Step-by-step resolution manuals and root cause matrices
CODE 6A (227)
Severity: Critical
Difficulty: Advanced
No Flame Signal Lockout
Locking fault 6A with subcode 227 triggers when the burner control unit fails to detect an ionization current above the safety threshold (1.5 µA DC) within the safety time window across four ignition sequences. The controller automatically terminates fuel delivery via the gas solenoid valve to prevent unburned gas accumulation.
⏱ 30-45 Mins
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