High
372 on Viessmann Vitodens 100-W B1GA

Your boiler is struggling to keep the flame lit during its automated setup process, meaning it cannot safely run to provide you with heating or hot water.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

Burner in a fault state Repeated flame loss during calibration

From this model's manual
Verified against the Viessmann Vitodens 100 W B1ga installation & service manual, page 60.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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