Buderus Diagnostics & Fault Manuals
Manufacturer of Buderus systems and diagnostic equipment.
Equipment Models
Hardware families produced by Buderus
Indexed Error Codes for Buderus
Machine-verified error code diagnostic walkthroughs
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.
Flame Detection Lockout Error 6A
The boiler control unit initiated an ignition cycle but failed to detect a valid ionization flame signal within the safety time window (approx. 4 seconds), causing safety lockout 6A (Cause 227) to prevent raw gas accumulation.