Viessmann burner lockouts: what the fault checker can and cannot settle

What Does Error Burner lockout group Mean?

A Viessmann burner lockout means the appliance attempted to establish combustion, failed to prove it within the permitted attempts, and stopped offering heat. Viessmann's own fault checker maps the displayed code to a condition, and the value of that tool is that it distinguishes lockouts from blocking faults, which behave and clear along different lines. Applies to: Viessmann Vitodens gas condensing boilers whose displayed fault codes are listed in the Viessmann fault checker The Vitodens range spans wall-hung combi, system, and floor-standing appliances across several generations, and code meanings are model-specific. Enter the code into Viessmann's own checker together with the appliance model rather than relying on a list that does not ask which boiler you have. Owner-safe checks: Photograph the display showing the code, then copy the full model name and serial number from the appliance data plate. | Record whether the boiler recovered on its own or needed a reset, and how many times each has happened. | Check the system pressure gauge while the system is cold and note the reading. Qualified technician: Gas pressure measurement, ignition and sensing component work, flue inspection, and condensate system correction are Gas Safe registered tasks. | A boiler that locks out again immediately after a reset should be left alone rather than reset repeatedly, because each attempt spends further ignition cycles against the same condition.